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aptdec
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Tidy up all formatting, fix english, markdown README, improved Makefile, minor code changes

tags/v1.8.0
Xerbo 5 år sedan
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18 ändrade filer med 798 tillägg och 783 borttagningar
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  1. +14
    -9
      Makefile
  2. +90
    -0
      README.md
  3. +109
    -119
      dsp.c
  4. +0
    -1
      falsecolor.conf
  5. +71
    -84
      fcolor.c
  6. +17
    -21
      filter.c
  7. +4
    -5
      filter.h
  8. +7
    -13
      filtercoeff.h
  9. +3
    -4
      gvipalette.h
  10. +148
    -160
      image.c
  11. +208
    -228
      main.c
  12. +2
    -2
      offsets.h
  13. +72
    -77
      reg.c
  14. +1
    -3
      satcal.h
  15. +1
    -1
      temppalette.h
  16. +1
    -1
      version.h
  17. +44
    -49
      w32util.c
  18. +6
    -6
      w32util.h

+ 14
- 9
Makefile Visa fil

@@ -1,18 +1,23 @@

CC=gcc
BIN=/usr/bin
INCLUDES=-I.

CFLAGS= -O3 -Wall $(INCLUDES)

OBJS= main.o image.o dsp.o filter.o reg.o fcolor.o

atpdec: $(OBJS)
aptdec: $(OBJS)
$(CC) -o $@ $(OBJS) -lm -lsndfile -lpng

main.o: main.c version.h temppalette.h gvipalette.h offsets.h
dsp.o: dsp.c filtercoeff.h filter.h
main.o: main.c version.h temppalette.h gvipalette.h offsets.h
dsp.o: dsp.c filtercoeff.h filter.h
filter.o: filter.c filter.h
image.o: image.c satcal.h offsets.h
fcolor.o : fcolor.c offsets.h
image.o: image.c satcal.h offsets.h
fcolor.o: fcolor.c offsets.h

clean:
rm -f *.o atpdec
rm -f *.o aptdec

install:
install -m 755 aptdec $(BIN)

uninstall:
rm $(BIN)/aptdec

+ 90
- 0
README.md Visa fil

@@ -0,0 +1,90 @@
# Aptdec

Thierry Leconte F4DWV (c) 2004-2009

## Description

Aptec is an FOSS program that decodes images transmitted by POES NOAA weather satellites.
These satellites transmit continuously (among other things), medium resolution (1px/4km) images of the earth on 137 MHz.
These transmissions could be easily received with an simple antenna and cheap SDR.
Then the transimssion can easily be decoded in narrow band FM mode.

Aptdec can convert these recordings into .png images.

For each recording up to 6 images can be generated:

1. Raw image: contains the 2 transmitted channel images + telemetry
and synchronisation pulses.
2. Calibrated channel A image
3. Calibrated channel B image
4. Temperature compensated I.R image
5. False color image

Input recordings must be mono with a sample rate of 11025 Hz.
Aptdec uses `libsndfile` to read the input recording, so any format supported by `libsndfile` may be used (only tested with .wav files).

## Compilation

Aptdec is written is portable since it is written in standard C.
It has only tested on Fedora and Debian, but will work on any Unix platform.
Just edit the Makefile and run `make` (no configure script as of now).

Aptdec uses `libsndfile`, `libpng` and `libm`.
The `snd.h` and `png.h` headers must be present on your system.
If they are not on standard path, edit the include path in the Makefile.

## Usage

To run without installing
`./Aptdec [options] recordings ...`

To install
`sudo make install`

To uninstall
`sudo make uninstall`

To run once installed
`Aptdec [options] recordings ...`

## Options

```
-i [r|a|b|c|t]
Toggle raw (r), channel A (a), channel B (b), false color (c),
or temperature (t) output.
Default: ac

-d <dir>
Optional images destination directory.
Default: Recording directory.

-s [15|16|17|18|19]
Satellite number
For temperature and false color generation
Default: 19

-c <file>
Use configuration file for false color generation.
Default: Internal parameters.
```

## Output

Generated images are outputted in PNG, 8 bit greyscale for raw and channel A|B images, 24 bit RGB for false color.

Image names are `recordingname-x.png`, where `x` is:

- r for raw images
- satellite instrument number (1, 2, 3A, 3B, 4, 5) for channel A|B images
- c for false colors.

## Example

`Aptdec -d images -i ac *.wav`

This will process all .wav files in the current directory, generate channel A and false color images and put them in the `images` directory.

## License

See LICENSE.

+ 109
- 119
dsp.c Visa fil

@@ -1,5 +1,5 @@
/*
* Atpdec
* Aptec
* Copyright (c) 2004 by Thierry Leconte (F4DWV)
*
* $Id$
@@ -23,19 +23,22 @@
#include <string.h>
#include <math.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846 /* for OS that don't know it */
#endif /* */
#define M_PI 3.14159265358979323846 /* for OS's that don't include it */
#endif
#include "filter.h"
#include "filtercoeff.h"

extern int getsample(float *inbuff, int nb);

#define BLKAMP 1024
#define BLKIN 1024

#define Fc 2400.0
#define DFc 50.0
#define PixelLine 2080
#define Fp (2*PixelLine)
#define Fp (2 * PixelLine)
#define RSMULT 15
#define Fi (Fp*RSMULT)
#define Fi (Fp * RSMULT)

static double Fe;

@@ -43,72 +46,67 @@ static double offset = 0.0;
static double FreqLine = 1.0;

static double FreqOsc;
static double K1,K2;
static double K1, K2;


int init_dsp(double F)
{
if(F > Fi) return (1);
if(F < Fp) return (-1);
Fe=F;
int init_dsp(double F) {
if(F > Fi) return (1);
if(F < Fp) return (-1);
Fe = F;

K1=DFc/Fe;
K2=K1*K1/2.0;
FreqOsc=Fc/Fe;
K1 = DFc / Fe;
K2 = K1 * K1 / 2.0;
FreqOsc = Fc / Fe;

return(0);
return(0);
}

/* fast phase estimator */
static inline double Phase(double I,double Q)
{
double angle,r;
int s;

if(I==0.0 && Q==0.0)
return(0.0);

if (Q < 0) {
s=-1;
Q=-Q;
} else {
s=1;
}
static inline double Phase(double I,double Q) {
double angle,r;
int s;

if(I == 0.0 && Q == 0.0)
return(0.0);

if (Q < 0) {
s = -1;
Q = -Q;
} else {
s = 1;
}
if (I>=0) {
r = (I - Q) / (I + Q);
angle = 0.25 - 0.25 * r;
} else {
r = (I + Q) / (Q - I);
angle = 0.75 - 0.25 * r;
}
if(s>0)
return(angle);
else
return(-angle);
if (I >= 0) {
r = (I - Q) / (I + Q);
angle = 0.25 - 0.25 * r;
} else {
r = (I + Q) / (Q - I);
angle = 0.75 - 0.25 * r;
}
if(s > 0)
return(angle);
else
return(-angle);
}

static double pll(double I, double Q)
{

/* pll coeff */
static double pll(double I, double Q) {
/* pll coeff */
static double PhaseOsc = 0.0;
double Io, Qo;
double Ip, Qp;
double DPhi;

/* quadrature oscillator */
/* quadrature oscillator */
Io = cos(PhaseOsc);
Qo = sin(PhaseOsc);

/* phase detector */
Ip = I*Io+Q*Qo;
Qp = Q*Io-I*Qo;
DPhi = Phase(Ip,Qp);

/* loop filter */
/* phase detector */
Ip = I * Io + Q * Qo;
Qp = Q * Io - I * Qo;
DPhi = Phase(Ip, Qp);

/* loop filter */
PhaseOsc += 2.0 * M_PI * (K1 * DPhi + FreqOsc);
if (PhaseOsc > M_PI)
PhaseOsc -= 2.0 * M_PI;
@@ -124,10 +122,7 @@ static double pll(double I, double Q)
return (Ip);
}

static int getamp(double *ambuff, int nb)
{

#define BLKIN 1024
static int getamp(double *ambuff, int nb) {
static float inbuff[BLKIN];
static int idxin=0;
static int nin=0;
@@ -135,70 +130,66 @@ static int getamp(double *ambuff, int nb)
int n;

for (n = 0; n < nb; n++) {
double I,Q;
if (nin < IQFilterLen*2+2) {
int res;
memmove(inbuff, &(inbuff[idxin]), nin * sizeof(float));
idxin = 0;
res = getsample(&(inbuff[nin]), BLKIN - nin);
nin += res;
if (nin < IQFilterLen*2+2)
return (n);
}
iqfir(&inbuff[idxin],iqfilter,IQFilterLen,&I,&Q);
ambuff[n] = pll(I,Q);
idxin += 1;
nin -= 1;
double I, Q;
if (nin < IQFilterLen * 2 + 2) {
int res;
memmove(inbuff, &(inbuff[idxin]), nin * sizeof(float));
idxin = 0;
res = getsample(&(inbuff[nin]), BLKIN - nin);
nin += res;
if (nin < IQFilterLen * 2 + 2)
return (n);
}
iqfir(&inbuff[idxin], iqfilter, IQFilterLen, &I, &Q);
ambuff[n] = pll(I, Q);
idxin += 1;
nin -= 1;
}
return (n);
}

int getpixelv(float *pvbuff, int nb)
{

#define BLKAMP 1024
int getpixelv(float *pvbuff, int nb) {
static double ambuff[BLKAMP];
static int nam = 0;
static int idxam = 0;

int n,m;
int n, m;
double mult;

mult = (double) Fi/Fe*FreqLine;
mult = (double) Fi / Fe * FreqLine;

m=RSFilterLen/mult+1;
m = RSFilterLen / mult + 1;

for (n = 0; n < nb; n++) {
int shift;

if (nam < m) {
int res;
memmove(ambuff, &(ambuff[idxam]), nam * sizeof(double));
idxam = 0;
res = getamp(&(ambuff[nam]), BLKAMP - nam);
nam += res;
if (nam < m)
return (n);
}
int shift;

pvbuff[n] = rsfir(&(ambuff[idxam]), rsfilter, RSFilterLen, offset, mult) * mult * 256.0;
if (nam < m) {
int res;
memmove(ambuff, &(ambuff[idxam]), nam * sizeof(double));
idxam = 0;
res = getamp(&(ambuff[nam]), BLKAMP - nam);
nam += res;
if (nam < m)
return (n);
}

//printf("%g\n",pvbuff[n]);
pvbuff[n] = rsfir(&(ambuff[idxam]), rsfilter, RSFilterLen, offset, mult) * mult * 256.0;

shift = ((int) floor((RSMULT - offset) / mult))+1;
offset = shift*mult+offset-RSMULT ;
//printf("%g\n",pvbuff[n]);

idxam += shift;
nam -= shift;
shift = ((int) floor((RSMULT - offset) / mult)) + 1;
offset = shift * mult + offset - RSMULT ;

idxam += shift;
nam -= shift;
}
return (nb);
}

int getpixelrow(float *pixelv)
{
int getpixelrow(float *pixelv) {
static float pixels[PixelLine + SyncFilterLen];
static int npv = 0;
static int synced = 0;
@@ -208,11 +199,12 @@ int getpixelrow(float *pixelv)
int res;

if (npv > 0)
memmove(pixelv, pixels, npv * sizeof(float));
memmove(pixelv, pixels, npv * sizeof(float));

if (npv < SyncFilterLen + 2) {
res = getpixelv(&(pixelv[npv]), SyncFilterLen + 2 - npv);
npv += res;
if (npv < SyncFilterLen + 2)
res = getpixelv(&(pixelv[npv]), SyncFilterLen + 2 - npv);
npv += res;
if (npv < SyncFilterLen + 2)
return (0);
}

@@ -222,16 +214,15 @@ int getpixelrow(float *pixelv)
lcorr = fir(&(pixelv[2]), Sync, SyncFilterLen);
FreqLine = 1.0+((ecorr-lcorr) / corr / PixelLine / 4.0);
if (corr < 0.75 * max) {
synced = 0;
FreqLine = 1.0;
synced = 0;
FreqLine = 1.0;
}
max = corr;
if (synced < 8) {
int shift, mshift;

if (npv < PixelLine + SyncFilterLen) {
res =
getpixelv(&(pixelv[npv]), PixelLine + SyncFilterLen - npv);
res = getpixelv(&(pixelv[npv]), PixelLine + SyncFilterLen - npv);
npv += res;
if (npv < PixelLine + SyncFilterLen)
return (0);
@@ -244,31 +235,30 @@ int getpixelrow(float *pixelv)

corr = fir(&(pixelv[shift + 1]), Sync, SyncFilterLen);
if (corr > max) {
mshift = shift;
max = corr;
mshift = shift;
max = corr;
}
}
if (mshift != 0) {
memmove(pixelv, &(pixelv[mshift]),
(npv - mshift) * sizeof(float));
memmove(pixelv, &(pixelv[mshift]), (npv - mshift) * sizeof(float));
npv -= mshift;
synced = 0;
FreqLine = 1.0;
} else
synced += 1;
}

if (npv < PixelLine) {
res = getpixelv(&(pixelv[npv]), PixelLine - npv);
npv += res;
if (npv < PixelLine)
return (0);
res = getpixelv(&(pixelv[npv]), PixelLine - npv);
npv += res;
if (npv < PixelLine)
return (0);
}
if (npv == PixelLine) {
npv = 0;
npv = 0;
} else {
memmove(pixels, &(pixelv[PixelLine]),
(npv - PixelLine) * sizeof(float));
npv -= PixelLine;
memmove(pixels, &(pixelv[PixelLine]), (npv - PixelLine) * sizeof(float));
npv -= PixelLine;
}

return (1);


+ 0
- 1
falsecolor.conf Visa fil

@@ -7,4 +7,3 @@
240.0 0.6 0.4
60.0 0.6 0.2
100.0 0.1 0.5


+ 71
- 84
fcolor.c Visa fil

@@ -6,15 +6,14 @@ typedef struct {
float h, s, v;
} hsvpix_t;

static void HSVtoRGB(float *r, float *g, float *b, hsvpix_t pix)
{
static void HSVtoRGB(float *r, float *g, float *b, hsvpix_t pix) {
int i;
double f, p, q, t, h;

if (pix.s == 0) {
// achromatic (grey)
*r = *g = *b = pix.v;
return;
// achromatic (grey)
*r = *g = *b = pix.v;
return;
}

h = pix.h / 60; // sector 0 to 5
@@ -25,44 +24,44 @@ static void HSVtoRGB(float *r, float *g, float *b, hsvpix_t pix)
t = pix.v * (1 - pix.s * (1 - f));

switch (i) {
case 0:
*r = pix.v;
*g = t;
*b = p;
break;
case 1:
*r = q;
*g = pix.v;
*b = p;
break;
case 2:
*r = p;
*g = pix.v;
*b = t;
break;
case 3:
*r = p;
*g = q;
*b = pix.v;
break;
case 4:
*r = t;
*g = p;
*b = pix.v;
break;
default: // case 5:
*r = pix.v;
*g = p;
*b = q;
break;
case 0:
*r = pix.v;
*g = t;
*b = p;
break;
case 1:
*r = q;
*g = pix.v;
*b = p;
break;
case 2:
*r = p;
*g = pix.v;
*b = t;
break;
case 3:
*r = p;
*g = q;
*b = pix.v;
break;
case 4:
*r = t;
*g = p;
*b = pix.v;
break;
default: // case 5:
*r = pix.v;
*g = p;
*b = q;
break;
}

}

static struct {
float Seathresold;
float Landthresold;
float Tthresold;
float Seathreshold;
float Landthreshold;
float Threshold;
hsvpix_t CloudTop;
hsvpix_t CloudBot;
hsvpix_t SeaTop;
@@ -79,58 +78,47 @@ static struct {
100.0, 0.0, 0.5}
};

void readfconf(char *file)
{
void readfconf(char *file) {
FILE *fin;

fin = fopen(file, "r");
if (fin == NULL)
return;

fscanf(fin, "%g\n", &fcinfo.Seathresold);
fscanf(fin, "%g\n", &fcinfo.Landthresold);
fscanf(fin, "%g\n", &fcinfo.Tthresold);
fscanf(fin, "%g %g %g\n", &fcinfo.CloudTop.h, &fcinfo.CloudTop.s,
&fcinfo.CloudTop.v);
fscanf(fin, "%g %g %g\n", &fcinfo.CloudBot.h, &fcinfo.CloudBot.s,
&fcinfo.CloudBot.v);
fscanf(fin, "%g %g %g\n", &fcinfo.SeaTop.h, &fcinfo.SeaTop.s,
&fcinfo.SeaTop.v);
fscanf(fin, "%g %g %g\n", &fcinfo.SeaBot.h, &fcinfo.SeaBot.s,
&fcinfo.SeaBot.v);
fscanf(fin, "%g %g %g\n", &fcinfo.GroundTop.h, &fcinfo.GroundTop.s,
&fcinfo.GroundTop.v);
fscanf(fin, "%g %g %g\n", &fcinfo.GroundBot.h, &fcinfo.GroundBot.s,
&fcinfo.GroundBot.v);
return;

fscanf(fin, "%g\n", &fcinfo.Seathreshold);
fscanf(fin, "%g\n", &fcinfo.Landthreshold);
fscanf(fin, "%g\n", &fcinfo.Threshold);
fscanf(fin, "%g %g %g\n", &fcinfo.CloudTop.h, &fcinfo.CloudTop.s, &fcinfo.CloudTop.v);
fscanf(fin, "%g %g %g\n", &fcinfo.CloudBot.h, &fcinfo.CloudBot.s, &fcinfo.CloudBot.v);
fscanf(fin, "%g %g %g\n", &fcinfo.SeaTop.h, &fcinfo.SeaTop.s, &fcinfo.SeaTop.v);
fscanf(fin, "%g %g %g\n", &fcinfo.SeaBot.h, &fcinfo.SeaBot.s, &fcinfo.SeaBot.v);
fscanf(fin, "%g %g %g\n", &fcinfo.GroundTop.h, &fcinfo.GroundTop.s, &fcinfo.GroundTop.v);
fscanf(fin, "%g %g %g\n", &fcinfo.GroundBot.h, &fcinfo.GroundBot.s, &fcinfo.GroundBot.v);

fclose(fin);

};

void falsecolor(double v, double t, float *r, float *g, float *b)
{
void falsecolor(double v, double t, float *r, float *g, float *b) {
hsvpix_t top, bot, c;
double scv, sct;

if (t > fcinfo.Tthresold) {
if (v < fcinfo.Seathresold) {
/* sea */
top = fcinfo.SeaTop, bot = fcinfo.SeaBot;
scv = v / fcinfo.Seathresold;
sct = (256.0-t) / (256.0-fcinfo.Tthresold);
} else {
/* ground */
top = fcinfo.GroundTop, bot = fcinfo.GroundBot;
scv =
(v - fcinfo.Seathresold) / (fcinfo.Landthresold -
fcinfo.Seathresold);
sct = (256.0-t) / (256.0-fcinfo.Tthresold);
}
if (t > fcinfo.Threshold) {
if (v < fcinfo.Seathreshold) {
/* sea */
top = fcinfo.SeaTop, bot = fcinfo.SeaBot;
scv = v / fcinfo.Seathreshold;
sct = (256.0 - t) / (256.0 - fcinfo.Threshold);
} else {
/* ground */
top = fcinfo.GroundTop, bot = fcinfo.GroundBot;
scv = (v - fcinfo.Seathreshold) / (fcinfo.Landthreshold - fcinfo.Seathreshold);
sct = (256.0 - t) / (256.0 - fcinfo.Threshold);
}
} else {
/* clouds */
top = fcinfo.CloudTop, bot = fcinfo.CloudBot;
scv = v / 256.0;
sct = (256.0-t) / 256.0;
/* clouds */
top = fcinfo.CloudTop, bot = fcinfo.CloudBot;
scv = v / 256.0;
sct = (256.0 - t) / 256.0;
}

c.s = top.s + sct * (bot.s - top.s);
@@ -140,11 +128,10 @@ void falsecolor(double v, double t, float *r, float *g, float *b)
HSVtoRGB(r, g, b, c);
};

void Ngvi(float **prow, int nrow)
{
void Ngvi(float **prow, int nrow) {
int n;

printf("GVI ... ");
printf("GVI... ");
fflush(stdout);

for (n = 0; n < nrow; n++) {
@@ -154,11 +141,11 @@ void Ngvi(float **prow, int nrow)
pixelv = prow[n];
for (i = 0; i < CH_WIDTH; i++) {
float pv;
double gvi;
double gvi;

gvi = (pixelv[i + CHA_OFFSET]-pixelv[i + CHB_OFFSET])/(pixelv[i + CHA_OFFSET]+pixelv[i + CHB_OFFSET]);
gvi = (pixelv[i + CHA_OFFSET] - pixelv[i + CHB_OFFSET]) / (pixelv[i + CHA_OFFSET] + pixelv[i + CHB_OFFSET]);

pv = (gvi+0.1)*340.0;
pv = (gvi + 0.1) * 340.0;
if (pv > 255.0)
pv = 255.0;
if (pv < 0.0)


+ 17
- 21
filter.c Visa fil

@@ -1,5 +1,5 @@
/*
* Atpdec
* Aptec
* Copyright (c) 2004 by Thierry Leconte (F4DWV)
*
* $Id$
@@ -22,47 +22,43 @@
#include "filter.h"
#include <math.h>

float fir(float *buff, const float *coeff, const int len)
{
float fir(float *buff, const float *coeff, const int len) {
int i;
double r;

r = 0.0;
for (i = 0; i < len; i++) {
r += buff[i] * coeff[i];
r += buff[i] * coeff[i];
}
return r;
}

void iqfir(float *buff, const float *coeff, const int len,double *I,double *Q)
{
void iqfir(float *buff, const float *coeff, const int len, double *I, double *Q) {
int k;
double i,q;
double i, q;

i=q=0.0;
i = q = 0.0;
for (k = 0; k < len; k++) {
q += buff[2*k] * coeff[k];
i += buff[2*k] ;
}
i= buff[len-1]-i/len;
*I=i,*Q=q;
q += buff[2*k] * coeff[k];
i += buff[2*k];
}
i= buff[len-1] - i / len;
*I=i, *Q=q;
}

float rsfir(double *buff, const float *coeff, const int len, const double offset,
const double delta)
{
float rsfir(double *buff, const float *coeff, const int len, const double offset, const double delta) {
int i;
double n;
double out;

out = 0.0;
for (i = 0, n = offset; i < (len-1)/delta-1; n += delta, i++) {
int k;
double alpha;
int k;
double alpha;

k = (int)floor(n);
alpha = n - k;
out += buff[i]*(coeff[k]*(1.0-alpha)+coeff[k + 1]*alpha);
k = (int)floor(n);
alpha = n - k;
out += buff[i] * (coeff[k] * (1.0 - alpha) + coeff[k + 1] * alpha);
}
return out;
}


+ 4
- 5
filter.h Visa fil

@@ -1,5 +1,5 @@
/*
* Atpdec
* Aptec
* Copyright (c) 2003 by Thierry Leconte (F4DWV)
*
* $Id$
@@ -20,8 +20,7 @@
*
*/
float fir(float *buff,const float *coeff,const int len);
void iqfir(float *buff,const float *coeff,const int len,double *I,double *Q);
float rsfir(double *buff,const float *coeff,const int len ,const double offset ,const double delta);
float fir(float *buff, const float *coeff, const int len);
void iqfir(float *buff, const float *coeff, const int len, double *I, double *Q);
float rsfir(double *buff, const float *coeff, const int len, const double offset, const double delta);

+ 7
- 13
filtercoeff.h Visa fil

@@ -1,5 +1,5 @@
/*
* Atpdec
* Aptec
* Copyright (c) 2003 by Thierry Leconte (F4DWV)
*
* $Id$
@@ -21,24 +21,19 @@
*/
#define IQFilterLen 32
const float iqfilter[IQFilterLen] =
{ 0.0205361, 0.0219524, 0.0235785, 0.0254648, 0.0276791, 0.0303152,
const float iqfilter[IQFilterLen] = { 0.0205361, 0.0219524, 0.0235785, 0.0254648, 0.0276791, 0.0303152,
0.0335063, 0.0374482, 0.0424413, 0.0489708, 0.0578745, 0.0707355, 0.0909457, 0.127324, 0.212207, 0.63662,
-0.63662, -0.212207, -0.127324, -0.0909457, -0.0707355, -0.0578745, -0.0489708, -0.0424413, -0.0374482,
-0.0335063, -0.0303152, -0.0276791, -0.0254648, -0.0235785, -0.0219524, -0.0205361
};
-0.0335063, -0.0303152, -0.0276791, -0.0254648, -0.0235785, -0.0219524, -0.0205361 };


#define SyncFilterLen 32
const float Sync[SyncFilterLen] =
{ -14, -14, -14, 18, 18, -14, -14, 18, 18, -14, -14, 18, 18, -14, -14,
18, 18, -14, -14, 18, 18, -14, -14, 18, 18, -14, -14, 18, 18, -14, -14, -14
};
const float Sync[SyncFilterLen] = { -14, -14, -14, 18, 18, -14, -14, 18, 18, -14, -14, 18, 18, -14, -14,
18, 18, -14, -14, 18, 18, -14, -14, 18, 18, -14, -14, 18, 18, -14, -14, -14 };


#define RSFilterLen 437
const float rsfilter[RSFilterLen] =
{ -3.37279e-04, -8.80292e-06, -3.96418e-04, -1.78544e-04, -5.27511e-04,
const float rsfilter[RSFilterLen] = { -3.37279e-04, -8.80292e-06, -3.96418e-04, -1.78544e-04, -5.27511e-04,
-3.75376e-04, -6.95337e-04, -5.93148e-04, -8.79730e-04, -8.15327e-04, -1.05669e-03, -1.01377e-03,
-1.19836e-03, -1.15443e-03, -1.26937e-03, -1.20955e-03, -1.23904e-03, -1.15302e-03, -1.08660e-03,
-9.64235e-04, -8.02450e-04, -6.46202e-04, -3.95376e-04, -2.18096e-04, 1.11906e-04, 2.89567e-04,
@@ -100,7 +95,6 @@ const float rsfilter[RSFilterLen] =
-6.46202e-04, -8.02450e-04, -9.64235e-04, -1.08660e-03, -1.15302e-03, -1.23904e-03, -1.20955e-03,
-1.26937e-03, -1.15443e-03, -1.19836e-03, -1.01377e-03, -1.05669e-03, -8.15327e-04, -8.79730e-04,
-5.93148e-04, -6.95337e-04, -3.75376e-04, -5.27511e-04, -1.78544e-04, -3.96418e-04, -8.80292e-06,
-3.37279e-04
};
-3.37279e-04 };



+ 3
- 4
gvipalette.h Visa fil

@@ -1,4 +1,4 @@
unsigned char GviPalette[256*3]= {
unsigned char GviPalette[256*3] = {
"\230t\17\233x\22\236{\27\241\200\33\244\203\37\247\210#\252\214'\255\220"
",\260\2240\264\2305\267\2358\272\240=\274\245A\300\251E\303\255I\306\262"
"M\311\266Q\314\272V\317\276Z\322\302^\325\306b\330\312g\334\317k\337\323"
@@ -27,6 +27,5 @@
"\311\2\234\306\2\230\303\2\223\300\3\216\275\3\211\273\2\205\267\2\200\265"
"\2|\262\2w\257\2s\254\2n\251\2j\246\2e\243\2`\240\2[\235\2W\232\1S\230\2"
"M\225\1I\221\2E\217\1@\214\1;\211\1""7\206\1""1\203\1-\200\0(~\1${\0\37y"
"\0\33u\0\25r\0\21p\0\14l\0\7j\0\3g",
};

"\0\33u\0\25r\0\21p\0\14l\0\7j\0\3g"
};

+ 148
- 160
image.c Visa fil

@@ -1,5 +1,5 @@
/*
* Atpdec
* Aptec
* Copyright (c) 2004 by Thierry Leconte (F4DWV)
*
* $Id$
@@ -29,28 +29,24 @@

#define REGORDER 3
typedef struct {
double cf[REGORDER + 1];
double cf[REGORDER + 1];
} rgparam;

static void rgcomp(double x[16], rgparam * rgpr)
{
/*{ 0.106,0.215,0.324,0.433,0.542,0.652,0.78,0.87 ,0.0 }; */
const double y[9] =
{ 31.07, 63.02, 94.96, 126.9, 158.86, 191.1, 228.62, 255.0, 0.0 };
extern void polyreg(const int m, const int n, const double x[],
const double y[], double c[]);
static void rgcomp(double x[16], rgparam * rgpr) {
/*{ 0.106,0.215,0.324,0.433,0.542,0.652,0.78,0.87 ,0.0 }; */
const double y[9] = { 31.07, 63.02, 94.96, 126.9, 158.86, 191.1, 228.62, 255.0, 0.0 };
extern void polyreg(const int m, const int n, const double x[], const double y[], double c[]);

polyreg(REGORDER, 9, x, y, rgpr->cf);
polyreg(REGORDER, 9, x, y, rgpr -> cf);
}

static double rgcal(float x, rgparam * rgpr)
{
static double rgcal(float x, rgparam * rgpr) {
double y, p;
int i;

for (i = 0, y = 0.0, p = 1.0; i < REGORDER + 1; i++) {
y += rgpr->cf[i] * p;
p = p * x;
y += rgpr->cf[i] * p;
p = p * x;
}
return (y);
}
@@ -60,9 +56,7 @@ static double tele[16];
static double Cs;
static int nbtele;

int Calibrate(float **prow, int nrow, int offset)
{

int Calibrate(float **prow, int nrow, int offset) {
double teleline[3000];
double wedge[16];
rgparam regr[30];
@@ -72,143 +66,142 @@ int Calibrate(float **prow, int nrow, int offset)
int channel = -1;
float max;

printf("Calibration ... ");
printf("Calibration... ");
fflush(stdout);

/* build telemetry values lines */
/* build telemetry values lines */
for (n = 0; n < nrow; n++) {
int i;
int i;

teleline[n] = 0.0;
for (i = 3; i < 43; i++) {
teleline[n] += prow[n][i + offset + CH_WIDTH];
}
teleline[n] /= 40.0;
teleline[n] = 0.0;
for (i = 3; i < 43; i++) {
teleline[n] += prow[n][i + offset + CH_WIDTH];
}
teleline[n] /= 40.0;
}

if (nrow < 192) {
fprintf(stderr, " impossible, not enought row\n");
return (0);
fprintf(stderr, " not possible, not enough rows!\n");
return (0);
}

/* find telemetry start in the 2nd third */
/* find telemetry start in the 2nd third */
max = 0.0;
mtelestart = 0;
for (n = nrow / 3 - 64; n < 2 * nrow / 3 - 64; n++) {
float df;
df = (teleline[n - 4] + teleline[n - 3] + teleline[n - 2] +
teleline[n - 1]) / (teleline[n] + teleline[n + 1] +
teleline[n + 2] + teleline[n + 3]);
if (df > max) {
mtelestart = n;
max = df;
}
float df;
df = (teleline[n - 4] + teleline[n - 3] + teleline[n - 2] +
teleline[n - 1]) / (teleline[n] + teleline[n + 1] +
teleline[n + 2] + teleline[n + 3]);
if (df > max) {
mtelestart = n;
max = df;
}
}

mtelestart -= 64;
telestart = mtelestart % 128;

if (mtelestart < 0 || nrow < telestart + 128) {
fprintf(stderr, " impossible, not enought row\n");
return (0);
fprintf(stderr, " impossible, not enough row\n");
return (0);
}

/* compute wedges and regression */
/* compute wedges and regression */
for (n = telestart, k = 0; n < nrow - 128; n += 128, k++) {
int j;

for (j = 0; j < 16; j++) {
int i;

wedge[j] = 0.0;
for (i = 1; i < 7; i++)
wedge[j] += teleline[n + j * 8 + i];
wedge[j] /= 6;
}

rgcomp(wedge, &(regr[k]));
int j;

if (k == nrow / 256) {
int i, l;
for (j = 0; j < 16; j++) {
int i;

/* telemetry calibration */
for (j = 0; j < 16; j++) {
tele[j] = rgcal(wedge[j], &(regr[k]));
}


/* channel ID */
for (j = 0, max = 10000.0, channel = -1; j < 6; j++) {
float df;

df = wedge[15] - wedge[j];
df = df * df;
if (df < max) {
channel = j;
max = df;
wedge[j] = 0.0;
for (i = 1; i < 7; i++)
wedge[j] += teleline[n + j * 8 + i];
wedge[j] /= 6;
}
}

/* Cs computation */
for (Cs = 0.0, i = 0, j = n; j < n + 128; j++) {
double csline;

for (csline = 0.0, l = 3; l < 43; l++)
csline += prow[n][l + offset -SPC_WIDTH];
csline /= 40.0;
if (csline > 50.0) {
Cs += csline;
i++;

rgcomp(wedge, &(regr[k]));

if (k == nrow / 256) {
int i, l;

/* telemetry calibration */
for (j = 0; j < 16; j++) {
tele[j] = rgcal(wedge[j], &(regr[k]));
}

/* channel ID */
for (j = 0, max = 10000.0, channel = -1; j < 6; j++) {
float df;

df = wedge[15] - wedge[j];
df = df * df;
if (df < max) {
channel = j;
max = df;
}
}

/* Cs computation */
for (Cs = 0.0, i = 0, j = n; j < n + 128; j++) {
double csline;

for (csline = 0.0, l = 3; l < 43; l++)
csline += prow[n][l + offset -SPC_WIDTH];
csline /= 40.0;
if (csline > 50.0) {
Cs += csline;
i++;
}
}
Cs /= i;
Cs = rgcal(Cs, &(regr[k]));
}
}
Cs /= i;
Cs = rgcal(Cs, &(regr[k]));
}
}
nbtele = k;

/* calibrate */
/* calibrate */
for (n = 0; n < nrow; n++) {
float *pixelv;
int i;

pixelv = prow[n];
for (i = 0; i < CH_WIDTH; i++) {
float pv;
int k, kof;

pv = pixelv[i + offset];

k = (n - telestart) / 128;
if (k >= nbtele)
k = nbtele - 1;
kof = (n - telestart) % 128;
if (kof < 64) {
if (k < 1) {
pv = rgcal(pv, &(regr[k]));
} else {
pv = rgcal(pv, &(regr[k])) * (64 + kof) / 128.0 +
rgcal(pv, &(regr[k - 1])) * (64 - kof) / 128.0;
}
} else {
if ((k + 1) >= nbtele) {
pv = rgcal(pv, &(regr[k]));
} else {
pv = rgcal(pv, &(regr[k])) * (192 - kof) / 128.0 +
rgcal(pv, &(regr[k + 1])) * (kof - 64) / 128.0;
float *pixelv;
int i;

pixelv = prow[n];
for (i = 0; i < CH_WIDTH; i++) {
float pv;
int k, kof;

pv = pixelv[i + offset];

k = (n - telestart) / 128;
if (k >= nbtele)
k = nbtele - 1;
kof = (n - telestart) % 128;

if (kof < 64) {
if (k < 1) {
pv = rgcal(pv, &(regr[k]));
} else {
pv = rgcal(pv, &(regr[k])) * (64 + kof) / 128.0 + rgcal(pv, &(regr[k - 1])) * (64 - kof) / 128.0;
}
} else {
if ((k + 1) >= nbtele) {
pv = rgcal(pv, &(regr[k]));
} else {
pv = rgcal(pv, &(regr[k])) * (192 - kof) / 128.0 + rgcal(pv, &(regr[k + 1])) * (kof - 64) / 128.0;
}
}

if (pv > 255.0)
pv = 255.0;
if (pv < 0.0)
pv = 0.0;
pixelv[i + offset] = pv;
}
}

if (pv > 255.0)
pv = 255.0;
if (pv < 0.0)
pv = 0.0;
pixelv[i + offset] = pv;
}
}
printf("Done\n");
return (channel+1);
return (channel + 1);
}

/* ------------------------------temperature calibration -----------------------*/
@@ -223,51 +216,47 @@ typedef struct {
} tempparam;

/* temperature compensation for IR channel */
static void tempcomp(double t[16], int ch, tempparam * tpr)
{
static void tempcomp(double t[16], int ch, tempparam * tpr) {
double Tbb, T[4];
double C;
int n;

tpr->ch = ch - 4;
tpr -> ch = ch - 4;

/* compute equivalent T black body */
for (n = 0; n < 4; n++) {
float d0, d1, d2;
C = t[9 + n] * 4.0;
d0 = satcal[satnum].d[n][0];
d1 = satcal[satnum].d[n][1];
d2 = satcal[satnum].d[n][2];
T[n] = d0;
T[n] += d1 * C;
C = C * C;
T[n] += d2 * C;
float d0, d1, d2;
C = t[9 + n] * 4.0;
d0 = satcal[satnum].d[n][0];
d1 = satcal[satnum].d[n][1];
d2 = satcal[satnum].d[n][2];
T[n] = d0;
T[n] += d1 * C;
C = C * C;
T[n] += d2 * C;
}
Tbb = (T[0] + T[1] + T[2] + T[3]) / 4.0;
Tbb =
satcal[satnum].rad[tpr->ch].A +
satcal[satnum].rad[tpr->ch].B * Tbb;
Tbb = satcal[satnum].rad[tpr->ch].A + satcal[satnum].rad[tpr->ch].B * Tbb;

/* compute radiance Black body */
C = satcal[satnum].rad[tpr->ch].vc;
tpr->Nbb = c1 * C * C * C / (exp(c2 * C / Tbb) - 1.0);

/* store Count Blackbody and space */
tpr->Cs = Cs * 4.0;
tpr->Cb = t[14] * 4.0;
}

static double tempcal(float Ce, tempparam * rgpr)
{
static double tempcal(float Ce, tempparam * rgpr) {
double Nl, Nc, Ns, Ne;
double T, vc;

Ns = satcal[satnum].cor[rgpr->ch].Ns;
Nl = Ns + (rgpr->Nbb - Ns) * (rgpr->Cs - Ce * 4.0) / (rgpr->Cs -
rgpr->Cb);
Nl = Ns + (rgpr->Nbb - Ns) * (rgpr->Cs - Ce * 4.0) / (rgpr->Cs - rgpr->Cb);
Nc = satcal[satnum].cor[rgpr->ch].b[0] +
satcal[satnum].cor[rgpr->ch].b[1] * Nl +
satcal[satnum].cor[rgpr->ch].b[2] * Nl * Nl;
satcal[satnum].cor[rgpr->ch].b[1] * Nl +
satcal[satnum].cor[rgpr->ch].b[2] * Nl * Nl;

Ne = Nl + Nc;

@@ -275,38 +264,37 @@ static double tempcal(float Ce, tempparam * rgpr)
T = c2 * vc / log(c1 * vc * vc * vc / Ne + 1.0);
T = (T - satcal[satnum].rad[rgpr->ch].A) / satcal[satnum].rad[rgpr->ch].B;

/* rescale to range 0-255 for -60 +40 °C */
/* rescale to range 0-255 for -60 +40 'C */
T = (T - 273.15 + 60.0) / 100.0 * 256.0;

return (T);
}

void Temperature(float **prow, int nrow, int channel, int offset)
{
void Temperature(float **prow, int nrow, int channel, int offset) {
tempparam temp;
int n;

printf("Temperature ... ");
printf("Temperature... ");
fflush(stdout);

tempcomp(tele, channel, &temp);

for (n = 0; n < nrow; n++) {
float *pixelv;
int i;
float *pixelv;
int i;

pixelv = prow[n];
for (i = 0; i < CH_WIDTH; i++) {
float pv;
pixelv = prow[n];
for (i = 0; i < CH_WIDTH; i++) {
float pv;

pv = tempcal(pixelv[i + offset], &temp);
pv = tempcal(pixelv[i + offset], &temp);

if (pv > 255.0)
pv = 255.0;
if (pv < 0.0)
pv = 0.0;
pixelv[i + offset] = pv;
}
if (pv > 255.0)
pv = 255.0;
if (pv < 0.0)
pv = 0.0;
pixelv[i + offset] = pv;
}
}
printf("Done\n");
}

+ 208
- 228
main.c Visa fil

@@ -1,5 +1,5 @@
/*
* Atpdec
* Aptdec
* Copyright (c) 2004-2005 by Thierry Leconte (F4DWV)
*
* $Id$
@@ -45,87 +45,78 @@ extern int init_dsp(double F);;

static SNDFILE *inwav;

static int initsnd(char *filename)
{
static int initsnd(char *filename) {
SF_INFO infwav;
int res;
int res;

/* open wav input file */
/* open wav input file */
infwav.format = 0;
inwav = sf_open(filename, SFM_READ, &infwav);
if (inwav == NULL) {
fprintf(stderr, "could not open %s\n", filename);
return (1);
fprintf(stderr, "Could not open %s for reading\n", filename);
return (1);
}

res=init_dsp(infwav.samplerate);
if(res<0) {
fprintf(stderr, "Sample rate too low : %d\n", infwav.samplerate);
return (1);
res = init_dsp(infwav.samplerate);
if(res < 0) {
fprintf(stderr, "Sample rate too low: %d\n", infwav.samplerate);
return (1);
}
if(res>0) {
fprintf(stderr, "Sample rate too hight : %d\n", infwav.samplerate);
return (1);
if(res > 0) {
fprintf(stderr, "Sample rate too hight: %d\n", infwav.samplerate);
return (1);
}
fprintf(stderr, "Sample rate : %d\n", infwav.samplerate);
fprintf(stderr, "Sample rate: %d\n", infwav.samplerate);

if (infwav.channels != 1) {
fprintf(stderr, "Too many channels in input file : %d\n", infwav.channels);
return (1);
fprintf(stderr, "Too many channels in input file: %d\n", infwav.channels);
return (1);
}

return (0);
}

int getsample(float *sample, int nb)
{
int getsample(float *sample, int nb) {
return (sf_read_float(inwav, sample, nb));
}

static png_text text_ptr[] = {
{PNG_TEXT_COMPRESSION_NONE, "Software", version, sizeof(version)}
,
{PNG_TEXT_COMPRESSION_NONE, "Channel", NULL, 0}
,
{PNG_TEXT_COMPRESSION_NONE, "Description", "NOAA POES satellite Image",
25}
{PNG_TEXT_COMPRESSION_NONE, "Software", version, sizeof(version)},
{PNG_TEXT_COMPRESSION_NONE, "Channel", NULL, 0},
{PNG_TEXT_COMPRESSION_NONE, "Description", "NOAA POES satellite image", 25}
};

static int
ImageOut(char *filename, char *chid, float **prow, int nrow,
int width, int offset, png_color *palette)
{
static int ImageOut(char *filename, char *chid, float **prow, int nrow, int width, int offset, png_color *palette) {
FILE *pngfile;
png_infop info_ptr;
png_structp png_ptr;
int n;

/* init png lib */
png_ptr =
png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
/* init png lib */
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
fprintf(stderr, "could not open create png_ptr\n");
return (1);
fprintf(stderr, "Could not create a PNG write struct\n");
return (1);
}

info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
fprintf(stderr, "could not open create info_ptr\n");
return (1);
png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
fprintf(stderr, "Could not create a PNG info struct\n");
return (1);
}

if(palette==NULL) {
/* grey image */
if(palette == NULL) {
/* greyscale */
png_set_IHDR(png_ptr, info_ptr, width, nrow,
8, PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
8, PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
} else {
/* palette color mage */
/* palette color mage */
png_set_IHDR(png_ptr, info_ptr, width, nrow,
8, PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_set_PLTE(png_ptr, info_ptr, palette, 256);
8, PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_set_PLTE(png_ptr, info_ptr, palette, 256);
}

text_ptr[1].text = chid;
@@ -133,26 +124,26 @@ ImageOut(char *filename, char *chid, float **prow, int nrow,
png_set_text(png_ptr, info_ptr, text_ptr, 3);
png_set_pHYs(png_ptr, info_ptr, 4000, 4000, PNG_RESOLUTION_METER);

printf("Writing %s ... ", filename);
printf("Writing %s... ", filename);
fflush(stdout);
pngfile = fopen(filename, "wb");
if (pngfile == NULL) {
fprintf(stderr, "could not open %s\n", filename);
return (1);
fprintf(stderr, "Could not open %s for writing\n", filename);
return (1);
}
png_init_io(png_ptr, pngfile);
png_write_info(png_ptr, info_ptr);

for (n = 0; n < nrow; n++) {
float *pixelv;
png_byte pixel[2*IMG_WIDTH];
int i;
float *pixelv;
png_byte pixel[2*IMG_WIDTH];
int i;

pixelv = prow[n];
for (i = 0; i < width; i++) {
pixel[i] = pixelv[i + offset];
}
png_write_row(png_ptr, pixel);
pixelv = prow[n];
for (i = 0; i < width; i++) {
pixel[i] = pixelv[i + offset];
}
png_write_row(png_ptr, pixel);
}
png_write_end(png_ptr, info_ptr);
fclose(pngfile);
@@ -161,72 +152,69 @@ ImageOut(char *filename, char *chid, float **prow, int nrow,
return (0);
}

static int ImageRGBOut(char *filename, float **prow, int nrow)
{
static int ImageRGBOut(char *filename, float **prow, int nrow) {
FILE *pngfile;
png_infop info_ptr;
png_structp png_ptr;
int n;

extern void falsecolor(double v, double t, float *r, float *g,
float *b);
extern void falsecolor(double v, double t, float *r, float *g, float *b);

/* init png lib */
png_ptr =
png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
/* init png lib */
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
fprintf(stderr, "could not open create png_ptr\n");
return (1);
fprintf(stderr, "Could not create a PNG write struct\n");
return (1);
}

info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
fprintf(stderr, "could not open create info_ptr\n");
return (1);
png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
fprintf(stderr, "Could not create a PNG info struct\n");
return (1);
}

png_set_IHDR(png_ptr, info_ptr, CH_WIDTH , nrow ,
8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);

png_set_pHYs(png_ptr, info_ptr, 4000, 4000, PNG_RESOLUTION_METER);

text_ptr[1].text = "False Colors";
text_ptr[1].text = "False Color";
text_ptr[1].text_length = strlen(text_ptr[1].text);
png_set_text(png_ptr, info_ptr, text_ptr, 3);

printf("Computing False colors & writing : %s ...", filename);
printf("Computing false color & writing: %s... ", filename);
fflush(stdout);
pngfile = fopen(filename, "wb");
if (pngfile == NULL) {
fprintf(stderr, "could not open %s\n", filename);
return (1);
fprintf(stderr, "Could not open %s for writing\n", filename);
return (1);
}
png_init_io(png_ptr, pngfile);
png_write_info(png_ptr, info_ptr);

for (n = 0; n < nrow ; n++) {
png_color pix[CH_WIDTH];
float *pixelc;
int i;
png_color pix[CH_WIDTH];
float *pixelc;
int i;

pixelc = prow[n];
pixelc = prow[n];

for (i = 0; i < CH_WIDTH - 1; i++) {
float v, t;
float r, g, b;
for (i = 0; i < CH_WIDTH - 1; i++) {
float v, t;
float r, g, b;

v = pixelc[i+CHA_OFFSET];
t = pixelc[i+CHB_OFFSET];
v = pixelc[i+CHA_OFFSET];
t = pixelc[i+CHB_OFFSET];

falsecolor(v, t, &r, &g, &b);
falsecolor(v, t, &r, &g, &b);

pix[i].red = 255.0 * r;
pix[i].green = 255.0 * g;
pix[i].blue = 255.0 * b;
}
png_write_row(png_ptr, (png_bytep) pix);
pix[i].red = 255.0 * r;
pix[i].green = 255.0 * g;
pix[i].blue = 255.0 * b;
}
png_write_row(png_ptr, (png_bytep) pix);
}
png_write_end(png_ptr, info_ptr);
fclose(pngfile);
@@ -236,44 +224,41 @@ static int ImageRGBOut(char *filename, float **prow, int nrow)
}


static void Distrib(char *filename,float **prow,int nrow)
{
unsigned int distrib[256][256];
int n;
int x,y;
int max=0;
FILE *df;
static void Distrib(char *filename,float **prow,int nrow) {
unsigned int distrib[256][256];
int n;
int x, y;
int max = 0;
FILE *df;

for(y=0;y<256;y++)
for(x=0;x<256;x++)
distrib[y][x]=0;
for(y = 0; y < 256; y++)
for(x = 0; x < 256; x++)
distrib[y][x] = 0;

for(n=0;n<nrow;n++) {
float *pixelv;
int i;
for(n = 0; n < nrow; n++) {
float *pixelv;
int i;

pixelv=prow[n];
for(i=0;i<CH_WIDTH;i++) {

y=(int)(pixelv[i+CHA_OFFSET]);
x=(int)(pixelv[i+CHB_OFFSET]);
distrib[y][x]+=1;
if(distrib[y][x]> max) max=distrib[y][x];
}
}
df=fopen(filename,"w");
pixelv = prow[n];
for(i = 0; i < CH_WIDTH; i++) {
y = (int)(pixelv[i + CHA_OFFSET]);
x = (int)(pixelv[i + CHB_OFFSET]);
distrib[y][x] += 1;
if(distrib[y][x] > max) max=distrib[y][x];
}
}
df = fopen(filename,"w");

printf("Writing %s\n",filename);
printf("Writing %s\n",filename);

fprintf(df,"P2\n#max %d\n",max);
fprintf(df,"256 256\n255\n");
for(y=0;y<256;y++)
for(x=0;x<256;x++)
fprintf(df,"%d\n",(int)((255.0*(double)(distrib[y][x]))/(double)max));
fclose(df);
fprintf(df,"P2\n#max %d\n",max);
fprintf(df,"256 256\n255\n");
for(y=0;y<256;y++)
for(x=0;x<256;x++)
fprintf(df, "%d\n", (int)((255.0 * (double)(distrib[y][x])) / (double)max));
fclose(df);
}


extern int Calibrate(float **prow, int nrow, int offset);
extern void Temperature(float **prow, int nrow, int ch, int offset);
extern int Ngvi(float **prow, int nrow);
@@ -282,16 +267,13 @@ extern int optind, opterr;
extern char *optarg;
int satnum = 4;

static void usage(void)
{
fprintf(stderr, "atpdec [options] soundfiles ...\n");
fprintf(stderr,
"options:\n-d <dir>\tDestination directory\n-i [r|a|b|c|t]\tOutput image type\n\t\t\tr: Raw\n\t\t\ta: A chan.\n\t\t\tb: B chan.\n\t\t\tc: False color\n\t\t\tt: Temperature\n-c <file>\tFalse color config file\n-s [15|16|17|18|19]\tSatellite number (for temperature and false color generation)\n");
exit(1);
static void usage(void) {
fprintf(stderr, "Aptdec [options] recordings ...\n");
fprintf(stderr, "Options:\n -i [r|a|b|c|t] Output image type\n r: Raw\n a: A channel\n b: B channel\n c: False color\n t: Temperature\n -d <dir> Image destination directory.\n -s [15|16|17|18|19] Satellite number\n -c <file> False color config file\n");
exit(1);
}

int main(int argc, char **argv)
{
int main(int argc, char **argv) {
char pngfilename[1024];
char name[1024];
char pngdirname[1024] = "";
@@ -299,126 +281,124 @@ int main(int argc, char **argv)
float *prow[3000];
char *chid[] = { "?", "1", "2", "3A", "4", "5", "3B" };
int nrow;
int chA,chB;
int chA, chB;
int c;

printf("%s\n", version);

opterr = 0;
while ((c = getopt(argc, argv, "c:d:i:s:")) != EOF) {
switch (c) {
case 'd':
strcpy(pngdirname, optarg);
break;
case 'c':
readfconf(optarg);
break;
case 'i':
strcpy(imgopt, optarg);
break;
case 's':
satnum = atoi(optarg)-15;
if (satnum < 0 || satnum > 4) {
fprintf(stderr, "invalid satellite number : must be in [15-19]\n");
exit(1);
}
break;
default:
usage();
if(argc == 1){
usage();
}
while ((c = getopt(argc, argv, "c:d:i:s:")) != EOF) {
switch (c) {
case 'd':
strcpy(pngdirname, optarg);
break;
case 'c':
readfconf(optarg);
break;
case 'i':
strcpy(imgopt, optarg);
break;
case 's':
satnum = atoi(optarg)-15;
if (satnum < 0 || satnum > 4) {
fprintf(stderr, "Invalid satellite number, must be in the range [15-19]\n");
exit(1);
}
break;
default:
usage();
}
}

for (nrow = 0; nrow < 3000; nrow++)
prow[nrow] = NULL;
prow[nrow] = NULL;

for (; optind < argc; optind++) {

chA=chB=0;

strcpy(pngfilename, argv[optind]);
strcpy(name, basename(pngfilename));
strtok(name, ".");
if (pngdirname[0] == '\0') {
strcpy(pngfilename, argv[optind]);
strcpy(pngdirname, dirname(pngfilename));
}

/* open snd input */
if (initsnd(argv[optind]))
exit(1);

/* main loop */
printf("Decoding: %s \n", argv[optind]);
for (nrow = 0; nrow < 3000; nrow++) {
if (prow[nrow] == NULL)
prow[nrow] = (float *) malloc(sizeof(float) * 2150);
if (getpixelrow(prow[nrow]) == 0)
break;
printf("%d\r", nrow);
fflush(stdout);
}
printf("\nDone\n");
sf_close(inwav);
for (; optind < argc; optind++) {
chA = chB = 0;

strcpy(pngfilename, argv[optind]);
strcpy(name, basename(pngfilename));
strtok(name, ".");
if (pngdirname[0] == '\0') {
strcpy(pngfilename, argv[optind]);
strcpy(pngdirname, dirname(pngfilename));
}

/* raw image */
if (strchr(imgopt, (int) 'r') != NULL) {
sprintf(pngfilename, "%s/%s-r.png", pngdirname, name);
ImageOut(pngfilename, "raw", prow, nrow, IMG_WIDTH, 0,NULL);
}
/* open snd input */
if (initsnd(argv[optind]))
exit(1);

/* main loop */
printf("Decoding: %s \n", argv[optind]);
for (nrow = 0; nrow < 3000; nrow++) {
if (prow[nrow] == NULL)
prow[nrow] = (float *) malloc(sizeof(float) * 2150);
if (getpixelrow(prow[nrow]) == 0)
break;
printf("%d\r", nrow);
fflush(stdout);
}
printf("\nDone\n");
sf_close(inwav);

/* Channel A */
if (((strchr(imgopt, (int) 'a') != NULL)
|| (strchr(imgopt, (int) 'c') != NULL)
|| (strchr(imgopt, (int) 'd') != NULL))) {
chA = Calibrate(prow, nrow, CHA_OFFSET);
if (chA >= 0) {
if (strchr(imgopt, (int) 'a') != NULL) {
sprintf(pngfilename, "%s/%s-%s.png", pngdirname, name, chid[chA]);
ImageOut(pngfilename, chid[chA], prow, nrow, CH_WIDTH , CHA_OFFSET,NULL);
/* raw image */
if (strchr(imgopt, (int) 'r') != NULL) {
sprintf(pngfilename, "%s/%s-r.png", pngdirname, name);
ImageOut(pngfilename, "raw", prow, nrow, IMG_WIDTH, 0, NULL);
}
}
}

/* Channel B */
if ((strchr(imgopt, (int) 'b') != NULL)
|| (strchr(imgopt, (int) 'c') != NULL)
|| (strchr(imgopt, (int) 't') != NULL)
|| (strchr(imgopt, (int) 'd') != NULL)) {
chB = Calibrate(prow, nrow, CHB_OFFSET);
if (chB >= 0) {
if (strchr(imgopt, (int) 'b') != NULL) {
sprintf(pngfilename, "%s/%s-%s.png", pngdirname, name, chid[chB]);
ImageOut(pngfilename, chid[chB], prow, nrow, CH_WIDTH , CHB_OFFSET ,NULL);
/* Channel A */
if (((strchr(imgopt, (int) 'a') != NULL)
|| (strchr(imgopt, (int) 'c') != NULL)
|| (strchr(imgopt, (int) 'd') != NULL))) {
chA = Calibrate(prow, nrow, CHA_OFFSET);
if (chA >= 0 && strchr(imgopt, (int) 'a') != NULL) {
sprintf(pngfilename, "%s/%s-%s.png", pngdirname, name, chid[chA]);
ImageOut(pngfilename, chid[chA], prow, nrow, CH_WIDTH , CHA_OFFSET, NULL);
}
}
}
if (chB > 3) {
Temperature(prow, nrow, chB, CHB_OFFSET);
if (strchr(imgopt, (int) 't') != NULL) {
sprintf(pngfilename, "%s/%s-t.png", pngdirname, name);
ImageOut(pngfilename, "Temperature", prow, nrow, CH_WIDTH, CHB_OFFSET, (png_color*)TempPalette);

/* Channel B */
if ((strchr(imgopt, (int) 'b') != NULL)
|| (strchr(imgopt, (int) 'c') != NULL)
|| (strchr(imgopt, (int) 't') != NULL)
|| (strchr(imgopt, (int) 'd') != NULL)) {
chB = Calibrate(prow, nrow, CHB_OFFSET);
if (chB >= 0 && strchr(imgopt, (int) 'b') != NULL) {
sprintf(pngfilename, "%s/%s-%s.png", pngdirname, name, chid[chB]);
ImageOut(pngfilename, chid[chB], prow, nrow, CH_WIDTH , CHB_OFFSET ,NULL);
}
if (chB > 3) {
Temperature(prow, nrow, chB, CHB_OFFSET);
if (strchr(imgopt, (int) 't') != NULL) {
sprintf(pngfilename, "%s/%s-t.png", pngdirname, name);
ImageOut(pngfilename, "Temperature", prow, nrow, CH_WIDTH, CHB_OFFSET, (png_color*)TempPalette);
}
}
}
}
}

/* distribution */
if (chA && chB && strchr(imgopt, (int) 'd') != NULL) {
sprintf(pngfilename, "%s/%s-d.pnm", pngdirname, name);
Distrib(pngfilename, prow, nrow);
}
/* distribution */
if (chA && chB && strchr(imgopt, (int) 'd') != NULL) {
sprintf(pngfilename, "%s/%s-d.pnm", pngdirname, name);
Distrib(pngfilename, prow, nrow);
}

/* color image */
if (chA==2 && chB==4 && strchr(imgopt, (int) 'c') != NULL) {
sprintf(pngfilename, "%s/%s-c.png", pngdirname, name);
ImageRGBOut(pngfilename, prow, nrow);
}
/* color image */
if (chA == 2 && chB == 4 && strchr(imgopt, (int) 'c') != NULL) {
sprintf(pngfilename, "%s/%s-c.png", pngdirname, name);
ImageRGBOut(pngfilename, prow, nrow);
}

/* GVI image */
if (chA==1 && chB==2 && strchr(imgopt, (int) 'c') != NULL) {
Ngvi(prow, nrow);
sprintf(pngfilename, "%s/%s-c.png", pngdirname, name);
ImageOut(pngfilename, "GVI", prow, nrow, CH_WIDTH, CHB_OFFSET, (png_color*)GviPalette);
}
/* GVI image */
if (chA == 1 && chB == 2 && strchr(imgopt, (int) 'c') != NULL) {
Ngvi(prow, nrow);
sprintf(pngfilename, "%s/%s-c.png", pngdirname, name);
ImageOut(pngfilename, "GVI", prow, nrow, CH_WIDTH, CHB_OFFSET, (png_color*)GviPalette);
}
}
exit(0);
}

+ 2
- 2
offsets.h Visa fil

@@ -1,7 +1,7 @@
#define SYNC_WIDTH 39
#define SPC_WIDTH 47
#define SPC_WIDTH 47
#define TELE_WIDTH 45
#define CH_WIDTH 909
#define CH_WIDTH 909
#define CH_OFFSET (SYNC_WIDTH+SPC_WIDTH+CH_WIDTH+TELE_WIDTH)
#define IMG_WIDTH 2080
#define CHA_OFFSET (SYNC_WIDTH+SPC_WIDTH)


+ 72
- 77
reg.c Visa fil

@@ -1,6 +1,6 @@
/* ---------------------------------------------------------------------------

Polynomial regression, freely adapted from :
Polynomial regression, freely adapted from:
NUMERICAL METHODS: C Programs, (c) John H. Mathews 1995
Algorithm translated to C by: Dr. Norman Fahrer
@@ -10,36 +10,33 @@
E-mail address: in%"mathews@fullerton.edu"
*/

#include<math.h>
#include <math.h>

#define DMAX 5 /* Maximum degree of polynomial */
#define NMAX 10 /* Maximum number of points */

#define DMAX 5 /* Maximum degree of polynomial */
#define NMAX 10 /* Maximum number of points */
static void FactPiv(int N, double A[DMAX][DMAX], double B[], double Cf[]);
void
polyreg(const int M, const int N, const double X[], const double Y[],
double C[])
{
int R, K, J; /* Loop counters */
double A[DMAX][DMAX]; /* A */
void polyreg(const int M, const int N, const double X[], const double Y[], double C[]) {
int R, K, J; /* Loop counters */
double A[DMAX][DMAX]; /* A */
double B[DMAX];
double P[2 * DMAX + 1];
double x, y;
double p;


/* Zero the array */
for (R = 0; R < M + 1; R++)
B[R] = 0;
B[R] = 0;

/* Compute the column vector */
for (K = 0; K < N; K++) {
y = Y[K];
x = X[K];
p = 1.0;
for (R = 0; R < M + 1; R++) {
B[R] += y * p;
p = p * x;
}
for (K = 0; K < N; K++) {
y = Y[K];
x = X[K];
p = 1.0;
for (R = 0; R < M + 1; R++) {
B[R] += y * p;
p = p * x;
}
}

/* Zero the array */
@@ -49,31 +46,30 @@ polyreg(const int M, const int N, const double X[], const double Y[],

/* Compute the sum of powers of x_(K-1) */
for (K = 0; K < N; K++) {
x = X[K];
p = X[K];
for (J = 1; J <= 2 * M; J++) {
P[J] += p;
p = p * x;
}
x = X[K];
p = X[K];
for (J = 1; J <= 2 * M; J++) {
P[J] += p;
p = p * x;
}
}

/* Determine the matrix entries */
for (R = 0; R < M + 1; R++) {
for (K = 0; K < M + 1; K++)
A[R][K] = P[R + K];
for (K = 0; K < M + 1; K++)
A[R][K] = P[R + K];
}

/* Solve the linear system of M + 1 equations : A*C = B
/* Solve the linear system of M + 1 equations: A*C = B
for the coefficient vector C = (c_1,c_2,..,c_M,c_(M+1)) */
FactPiv(M + 1, A, B, C);
} /* end main */
} /* end main */


/*--------------------------------------------------------*/
static void FactPiv(int N, double A[DMAX][DMAX], double B[], double Cf[])
{
int K, P, C, J; /* Loop counters */
int Row[NMAX]; /* Field with row-number */
static void FactPiv(int N, double A[DMAX][DMAX], double B[], double Cf[]) {
int K, P, C, J; /* Loop counters */
int Row[NMAX]; /* Field with row-number */
double X[DMAX], Y[DMAX];
double SUM, DET = 1.0;
int T;
@@ -81,64 +77,63 @@ static void FactPiv(int N, double A[DMAX][DMAX], double B[], double Cf[])

/* Initialize the pointer vector */
for (J = 0; J < N; J++)
Row[J] = J;
Row[J] = J;

/* Start LU factorization */
for (P = 0; P < N - 1; P++) {

/* Find pivot element */
for (K = P + 1; K < N; K++) {
if (fabs(A[Row[K]][P]) > fabs(A[Row[P]][P])) {

/* Switch the index for the p-1 th pivot row if necessary */
T = Row[P];
Row[P] = Row[K];
Row[K] = T;
DET = -DET;
}
} /* End of simulated row interchange */
if (A[Row[P]][P] == 0) {
/* The matrix is SINGULAR ! */
return;
}

/* Multiply the diagonal elements */
DET = DET * A[Row[P]][P];

/* Form multiplier */
for (K = P + 1; K < N; K++) {
A[Row[K]][P] = A[Row[K]][P] / A[Row[P]][P];

/* Eliminate X_(p-1) */
for (C = P + 1; C < N + 1; C++) {
A[Row[K]][C] -= A[Row[K]][P] * A[Row[P]][C];
}
}
/* Find pivot element */
for (K = P + 1; K < N; K++) {
if (fabs(A[Row[K]][P]) > fabs(A[Row[P]][P])) {
/* Switch the index for the p-1 th pivot row if necessary */
T = Row[P];
Row[P] = Row[K];
Row[K] = T;
DET = -DET;
}
} /* End of simulated row interchange */
if (A[Row[P]][P] == 0) {
/* The matrix is SINGULAR! */
return;
}

/* Multiply the diagonal elements */
DET = DET * A[Row[P]][P];

/* Form multiplier */
for (K = P + 1; K < N; K++) {
A[Row[K]][P] = A[Row[K]][P] / A[Row[P]][P];

/* Eliminate X_(p-1) */
for (C = P + 1; C < N + 1; C++) {
A[Row[K]][C] -= A[Row[K]][P] * A[Row[P]][C];
}
}
} /* End of L*U factorization routine */
DET = DET * A[Row[N - 1]][N - 1];

/* Start the forward substitution */
for (K = 0; K < N; K++)
Y[K] = B[K];
Y[0] = B[Row[0]];
Y[K] = B[K];
Y[0] = B[Row[0]];
for (K = 1; K < N; K++) {
SUM = 0;
for (C = 0; C <= K - 1; C++)
SUM += A[Row[K]][C] * Y[C];
Y[K] = B[Row[K]] - SUM;
SUM = 0;
for (C = 0; C <= K - 1; C++)
SUM += A[Row[K]][C] * Y[C];
Y[K] = B[Row[K]] - SUM;
}

/* Start the back substitution */
X[N - 1] = Y[N - 1] / A[Row[N - 1]][N - 1];
for (K = N - 2; K >= 0; K--) {
SUM = 0;
for (C = K + 1; C < N; C++) {
SUM += A[Row[K]][C] * X[C];
}
X[K] = (Y[K] - SUM) / A[Row[K]][K];
} /* End of back substitution */
SUM = 0;
for (C = K + 1; C < N; C++) {
SUM += A[Row[K]][C] * X[C];
}
X[K] = (Y[K] - SUM) / A[Row[K]][K];
} /* End of back substitution */

/* Output */
for (K = 0; K < N; K++)
Cf[K] = X[K];
Cf[K] = X[K];
}

+ 1
- 3
satcal.h Visa fil

@@ -104,7 +104,5 @@ const struct {
}
};


const float c1=1.1910427e-5;
const float c2=1.4387752;

const float c2=1.4387752;

+ 1
- 1
temppalette.h Visa fil

@@ -1,4 +1,4 @@
unsigned char TempPalette[256*3]= {
unsigned char TempPalette[256*3] = {
"\376\376\376\376\376\376\375\375\376\374\375\376\374\375\375\374\373\375"
"\373\373\375\372\373\375\372\373\374\372\372\374\371\372\374\371\371\375"
"\370\371\374\367\370\375\367\370\374\367\367\374\366\367\373\366\366\373"


+ 1
- 1
version.h Visa fil

@@ -1,2 +1,2 @@
char version[]="Atpdec CVS version (c) 2004-2005 Thierry Leconte F4DWV";
char version[] = "Aptec CVS version (c) 2004-2005 Thierry Leconte F4DWV";


+ 44
- 49
w32util.c Visa fil

@@ -1,60 +1,57 @@
#include <stdio.h>
#include <string.h>
char * basename (const char *filename)
{
const char *p = filename + strlen (filename);
while (p != filename)
{
p--;
if (*p == '/' || *p == '\\')
return ((char *) p + 1);
}
return ((char *) filename);
char * basename (const char *filename) {
const char *p = filename + strlen (filename);
while (p != filename) {
p--;
if (*p == '/' || *p == '\\')
return ((char *) p + 1);
}
return ((char *) filename);
}
char *dirname(const char *path)
{
static char bname[1024];
register const char *endp;
char *dirname(const char *path) {
static char bname[1024];
register const char *endp;
/* Empty or NULL string gets treated as "." */
if (path == NULL || *path == '\0') {
(void)strncpy(bname, ".", sizeof bname);
return(bname);
}
/* Empty or NULL string gets treated as "." */
if (path == NULL || *path == '\0') {
(void)strncpy(bname, ".", sizeof bname);
return(bname);
}
/* Strip trailing slashes */
endp = path + strlen(path) - 1;
while (endp > path && *endp == '\\' )
endp--;
/* Strip trailing slashes */
endp = path + strlen(path) - 1;
while (endp > path && *endp == '\\')
endp--;
/* Find the start of the dir */
while (endp > path && *endp != '\\' )
endp--;
while (endp > path && *endp != '\\')
endp--;
/* Either the dir is "/" or there are no slashes */
if (endp == path) {
(void)strncpy(bname, *endp == '\\' ? "\\" : ".", sizeof bname);
return(bname);
(void)strncpy(bname, *endp == '\\' ? "\\": ".", sizeof bname);
return(bname);
} else {
do {
endp--;
} while (endp > path && *endp == '\\');
do {
endp--;
} while (endp > path && *endp == '\\');
}
if (endp - path + 2 > sizeof(bname)) {
return(NULL);
return(NULL);
}
strncpy(bname, path, endp - path + 2);
return(bname);
}
int opterr = 1, /* if error message should be printed */
optind = 1, /* index into parent argv vector */
optopt, /* character checked for validity */
optreset; /* reset getopt */
char *optarg; /* argument associated with option */
int opterr = 1, /* if error message should be printed */
optind = 1, /* index into parent argv vector */
optopt, /* character checked for validity */
optreset; /* reset getopt */
char *optarg; /* argument associated with option */
#define BADCH (int)'?'
#define BADARG (int)':'
@@ -64,17 +61,16 @@ char *optarg; /* argument associated with option */
* getopt --
* Parse argc/argv argument vector.
*/
int
getopt(nargc, nargv, ostr)
int getopt(nargc, nargv, ostr)
int nargc;
char * const *nargv;
const char *ostr;
{
# define __progname nargv[0]
static char *place = EMSG; /* option letter processing */
char *oli; /* option letter list index */
#define __progname nargv[0]
static char *place = EMSG; /* option letter processing */
char *oli; /* option letter list index */
if (optreset || !*place) { /* update scanning pointer */
if (optreset || !*place) { /* update scanning pointer */
optreset = 0;
if (optind >= nargc || *(place = nargv[optind]) != '-') {
place = EMSG;
@@ -85,7 +81,7 @@ getopt(nargc, nargv, ostr)
place = EMSG;
return (-1);
}
} /* option letter okay? */
} /* option letter okay? */
if ((optopt = (int)*place++) == (int)':' ||
!(oli = strchr(ostr, optopt))) {
/*
@@ -100,13 +96,13 @@ getopt(nargc, nargv, ostr)
(void)printf("%s: illegal option -- %c\n", __progname, optopt);
return (BADCH);
}
if (*++oli != ':') { /* don't need argument */
if (*++oli != ':') { /* don't need argument */
optarg = NULL;
if (!*place)
++optind;
}
else { /* need an argument */
if (*place) /* no white space */
else { /* need an argument */
if (*place) /* no white space */
optarg = place;
else if (nargc <= ++optind) { /* no arg */
place = EMSG;
@@ -117,12 +113,11 @@ getopt(nargc, nargv, ostr)
"%s: option requires an argument -- %c\n",
__progname, optopt);
return (BADCH);
}
else /* white space */
} else /* white space */
optarg = nargv[optind];
place = EMSG;
++optind;
}
return (optopt); /* dump back option letter */
return (optopt); /* dump back option letter */
}

+ 6
- 6
w32util.h Visa fil

@@ -1,12 +1,12 @@
extern char * basename (const char *filename);
extern char * basename(const char *filename);
extern char *dirname(const char *path);
extern int opterr, /* if error message should be printed */
optind , /* index into parent argv vector */
optopt, /* character checked for validity */
optreset; /* reset getopt */
extern char *optarg; /* argument associated with option */
extern int opterr, /* if error message should be printed */
optind , /* index into parent argv vector */
optopt, /* character checked for validity */
optreset; /* reset getopt */
extern char *optarg; /* argument associated with option */
extern int getopt(int nargc, char * const *nargv, const char *ostr);

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