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Image standardization

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Initially supports flipping and colour inversion
This commit is contained in:
Daniel Drake
2007-10-27 12:07:11 +01:00
parent 0ddfef6c21
commit 9960a7ff34
5 changed files with 75 additions and 0 deletions
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60
libfprint/img.c
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@@ -104,3 +104,63 @@ API_EXPORTED int fp_img_save_to_file(struct fp_img *img, char *path)
return 0;
}
static void vflip(struct fp_img *img)
{
int width = img->width;
int data_len = img->width * img->height;
unsigned char rowbuf[width];
int i;
for (i = 0; i < img->height / 2; i++) {
int offset = i * width;
int swap_offset = data_len - (width * (i + 1));
/* copy top row into buffer */
memcpy(rowbuf, img->data + offset, width);
/* copy lower row over upper row */
memcpy(img->data + offset, img->data + swap_offset, width);
/* copy buffer over lower row */
memcpy(img->data + swap_offset, rowbuf, width);
}
}
static void hflip(struct fp_img *img)
{
int width = img->width;
unsigned char rowbuf[width];
int i, j;
for (i = 0; i < img->height; i++) {
int offset = i * width;
memcpy(rowbuf, img->data + offset, width);
for (j = 0; j < width; j++)
img->data[offset + j] = rowbuf[width - j - 1];
}
}
static void invert_colors(struct fp_img *img)
{
int data_len = img->width * img->height;
int i;
for (i = 0; i < data_len; i++)
img->data[i] = 0xff - img->data[i];
}
API_EXPORTED void fp_img_standardize(struct fp_img *img)
{
if (img->flags & FP_IMG_V_FLIPPED) {
vflip(img);
img->flags &= ~FP_IMG_V_FLIPPED;
}
if (img->flags & FP_IMG_H_FLIPPED) {
hflip(img);
img->flags &= ~FP_IMG_H_FLIPPED;
}
if (img->flags & FP_IMG_COLORS_INVERTED) {
invert_colors(img);
img->flags &= ~FP_IMG_COLORS_INVERTED;
}
}