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#include <stdlib.h>
#include <glib.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <math.h>
int
main(int argc, char *argv[])
{
char *file;
GdkPixbuf *input;
GdkPixbuf *match_tmp, *match;
int x, y, i, j;
int x1, y1, mwidth, mheight, width, height;
gint stride, nch;
guchar *pix, *row;
g_type_init();
if (argc < 5)
exit(EXIT_FAILURE);
file = argv[1];
x1 = atoi(argv[2]);
y1 = atoi(argv[3]);
mwidth = atoi(argv[4]);
mheight = atoi(argv[5]);
input = gdk_pixbuf_new_from_file(file, NULL);
if (!input)
exit(EXIT_FAILURE);
match_tmp = gdk_pixbuf_new_subpixbuf(input, x1, y1, mwidth, mheight);
match = gdk_pixbuf_copy(match_tmp);
g_object_unref(match_tmp);
struct match_interval {
gint min, max;
} interval[3];
nch = gdk_pixbuf_get_n_channels(match);
stride = gdk_pixbuf_get_rowstride(match);
gint s = mwidth * mheight;
gint middle[3] = { 0, 0, 0 };
for (y = 0, row = gdk_pixbuf_get_pixels(match);
y < mheight; ++y, row += stride) {
for (x = 0, pix = row; x < mwidth; ++x, pix += nch) {
for (i = 0; i < 3; ++i)
middle[i] += pix[i];
}
}
for (i = 0; i < 3; ++i)
middle[i] /= s;
gint sigma[3] = { 0, 0, 0 };
for (y = 0, row = gdk_pixbuf_get_pixels(match);
y < mheight; ++y, row += stride) {
for (x = 0, pix = row; x < mwidth; ++x, pix += nch) {
for (i = 0; i < 3; ++i)
sigma[i] +=
(pix[i] - middle[i]) *
(pix[i] - middle[i]);
}
}
for (i = 0; i < 3; ++i)
sigma[i] = sqrt(sigma[i] / (s - 1));
printf("middle: %3d, %3d, %3d\n", middle[0], middle[1], middle[2]);
printf("sigma: %3d, %3d, %3d\n", sigma[0], sigma[1], sigma[2]);
for (i = 0; i < 3; ++i) {
interval[i].min = middle[i] - 2 * sigma[i];
interval[i].max = middle[i] + 2 * sigma[i];
printf("interval %d: [%3d - %3d]\n",
i, interval[i].min, interval[i].max);
}
nch = gdk_pixbuf_get_n_channels(input);
stride = gdk_pixbuf_get_rowstride(input);
width = gdk_pixbuf_get_width(input);
height = gdk_pixbuf_get_height(input);
for (y = 0, row = gdk_pixbuf_get_pixels(input);
y < height; ++y, row += stride) {
for (x = 0, pix = row; x < width; ++x, pix += nch) {
int H = 1;
for (i = 0; i < 3; ++i) {
if (!(pix[i] >= interval[i].min &&
pix[i] <= interval[i].max))
H = 0;
}
if (H)
pix[0] = pix[1] = pix[2] = 0;
}
}
gdk_pixbuf_save(input, "output_roi.tiff", "tiff", NULL, NULL);
g_object_unref(input);
g_object_unref(match);
}
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