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#include <wand/MagickWand.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#define round(x)((int)((x)+0.5))
#define ThrowWandException(wand) { char *description; ExceptionType severity; description=MagickGetException(wand,&severity); (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); description=(char *) MagickRelinquishMemory(description); exit(-1); }
#define array(i,j,k,l) (array[height*width*i + width*j + k + l])
int nImages;
unsigned long height;
unsigned long width;
int findmax (uint8_t *p, int n) {
int mx = 0, v = p[0];
for (int i = 1; i < n; i++) {
if (p[i] > v) {
v = p[i];
mx = i;
}
}
return mx;
}
int main(int argc, char **argv ) {
char *usage = "derive-background -i <input-list> -o <output-filename>";
char *output_file = NULL;
char *image_list = NULL;
int c;
while ((c = getopt (argc, argv, "i:o:h")) != -1)
switch (c) {
case 'i':
image_list = optarg;
break;
case 'o':
output_file = optarg;
break;
case 'h':
puts(usage);
exit(1);
break;
default:
break;
}
if( image_list == NULL || output_file == NULL ) {
puts(usage);
exit(1);
}
MagickWand *input_wand, *first_wand, *output_wand;
PixelIterator *input_iterator, *output_iterator;
PixelWand **pixels, *p_out;
double green, red, blue;
int i,j, k;
int image = 0;
char filename[256];
char rgb[128];
char *temp;
FILE *input_file;
uint8_t ***output;
MagickWandGenesis();
// open first image in input_file to deterimine the height and width
input_file = fopen( image_list, "r");
if(input_file != NULL) {
fgets(filename, sizeof(filename), input_file);
temp = strchr(filename, '\n');
if (temp != NULL) *temp = '\0';
} else {
printf("could not open file \n");
exit(1);
}
fclose(input_file);
first_wand = NewMagickWand();
if(MagickReadImage(first_wand, filename) == MagickFalse) {
ThrowWandException(first_wand);
}
int height = MagickGetImageHeight(first_wand);
int width = MagickGetImageWidth(first_wand);
if (height == 0 || width == 0) {
puts("height/or width is 0!");
exit(1);
}
first_wand = DestroyMagickWand(first_wand);
printf("height: %d width:%d \n", height, width);
// count number of images we have in the file
input_file = fopen( image_list, "r");
while((fgets(filename, sizeof(filename), input_file)) != NULL) {
nImages++;
}
fclose(input_file);
printf("number of images: %d \n", nImages);
// initialize the storage arrays
uint8_t * array = (uint8_t *)malloc(nImages*height*width*3*sizeof(uint8_t));
output = calloc(height, sizeof(output[0]));
for(i = 0; i < height; i++) {
output[i] = calloc(width, sizeof(output[0][0]));
for(j = 0; j < width; j++) {
output[i][j] = calloc(3, sizeof(output[0][0][0]));
}
}
// store each pixel in the storage array. array(nImages,height,width,{ R, G, B} )
input_file = fopen( image_list, "r");
if(input_file == NULL ) {
printf("error could not open input file");
exit(1);
}
while ((fgets(filename, sizeof(filename), input_file)) != NULL ) {
temp = strchr(filename, '\n');
if (temp != NULL) *temp = '\0';
input_wand = NewMagickWand();
MagickReadImage(input_wand, filename);
input_iterator = NewPixelIterator(input_wand);
printf("Image number:%d Filename: %s \n", image, filename);
for (i=0; i<height; i++) {
pixels = PixelGetNextIteratorRow(input_iterator, &j);
for (j=0; j<width ; j++) {
green = PixelGetGreen(pixels[j]);
blue = PixelGetBlue(pixels[j]);
red = PixelGetRed(pixels[j]);
array(image,i,j,0) = round(red*255);
array(image,i,j,1) = round(green*255);
array(image,i,j,2) = round(blue*255);
// printf("array: (%d, %d,%d,%d,%d,%d) \n", image, i, j, array[image][i][j][0], array[image][i][j][1], array[image][i][j][2]);
}
PixelSyncIterator(input_iterator);
}
PixelSyncIterator(input_iterator);
input_iterator=DestroyPixelIterator(input_iterator);
input_wand = DestroyMagickWand(input_wand);
image++;
}
fclose(input_file);
// calculate histograms
for (j = 0; j < height; j++) {
for (k = 0; k < width; k++) {
uint8_t red_histogram[255] = { 0 };
uint8_t blue_histogram[255] = { 0 };
uint8_t green_histogram[255] = { 0 };
for (i = 0; i < nImages; i++) {
red_histogram[array(i,j,k,0)] += 1;
blue_histogram[array(i,j,k,1)] += 1;
green_histogram[array(i,j,k,2)] += 1;
}
int red_val = findmax(red_histogram, 255);
int blue_val = findmax(blue_histogram, 255);
int green_val = findmax(green_histogram, 255);
output[j][k][0] = (int)red_val;
output[j][k][1] = (int)blue_val;
output[j][k][2] = (int)green_val;
}
}
pixels = NewPixelWand();
p_out = NewPixelWand();
PixelSetColor(p_out,"white");
output_wand = NewMagickWand();
MagickNewImage(output_wand,width,height,p_out);
output_iterator=NewPixelIterator(output_wand);
for(i=0; i<height; i++) {
pixels=PixelGetNextIteratorRow(output_iterator,&j);
for(j=0;j<width;j++) {
sprintf(rgb, "rgb(%d,%d,%d)", output[i][j][0], output[i][j][1], output[i][j][2]);
//printf("write (%d,%d), %s \n", i ,y, rgb);
PixelSetColor(pixels[j],rgb);
}
PixelSyncIterator(output_iterator);
}
output_iterator=DestroyPixelIterator(output_iterator);
MagickWriteImage(output_wand, output_file);
DestroyMagickWand(output_wand);
MagickWandTerminus();
return 0;
}
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