Fix map alignment when using crop noise

The crop noise effect shifts the enetire image in memory, however when applying a map this shift did not get taken into account.

src/dsp.c

@@ -238,9 +238,9 @@ int getpixelrow(float *pixelv, int nrow, int *zenith, int reset) {
 	lcorr = fir(&pixelv[2], Sync, SyncFilterLen - 2);
 	FreqLine = 1.0+((ecorr-lcorr) / corr / PixelLine / 4.0);
 
-	// Find the point in which ecorr and lcorr intercept
-	if(fabs(lcorr - ecorr) < minDoppler && fabs(fabs(lcorr - ecorr) - previous) < 10){
-		minDoppler = fabs(lcorr - ecorr);
+	double val = fabs(lcorr - ecorr)*0.25 + previous*0.75;
+	if(val < minDoppler && nrow > 10){
+		minDoppler = val;
 		*zenith = nrow;
 	}
 	previous = fabs(lcorr - ecorr);

src/image.c

@@ -279,7 +279,7 @@ void flipImage(image_t *img, int width, int offset){
 }
 
 // Calculate crop to reomve noise from the start and end of an image
-void cropNoise(image_t *img){
+int cropNoise(image_t *img){
 	#define NOISE_THRESH 180.0
 
 	// Average value of minute marker
@@ -324,6 +324,8 @@ void cropNoise(image_t *img){
 
 	// Ignore the noisy rows at the end
 	img->nrow = (endCrop - startCrop);
+
+	return startCrop;
 }
 
 // --- Temperature Calibration --- //

src/image.h

@@ -5,5 +5,5 @@ void linearEnhance(float **prow, int nrow, int offset, int width);
 int calibrate(float **prow, int nrow, int offset, int width) ;
 void denoise(float **prow, int nrow, int offset, int width);
 void flipImage(image_t *img, int width, int offset);
-void cropNoise(image_t *img);
+int cropNoise(image_t *img);
 void temperature(options_t *opts, image_t *img, int offset, int width);

src/main.c

@@ -178,7 +178,7 @@ static int processAudio(char *filename, options_t *opts){
 
 	// Crop noise from start and end of image
 	if(CONTAINS(opts->effects, Crop_Noise)){
-		cropNoise(&img);
+		img.zenith -= cropNoise(&img);
 	}
 
 	// Denoise