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introduce WebPPlaneDistortion to compute plane distortion

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Make WebPPictureDistortion() only compute distortion on A/R/G/B planes, not Y/U/V(A).
(not just for SSIM, but PSNR too).

This is to avoid problems with using SSIM on U/V channels.
If Y/U/V distortion is needed, one can always use WebPPlaneDistortion() individually.

Change-Id: If8bc9c3ac12a8d2220f03224694fc389b16b7da9
This commit is contained in:
Pascal Massimino
2016-10-19 09:12:13 +02:00
parent 0104d730bf
commit 2f51b614b0
3 changed files with 92 additions and 92 deletions
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23
examples/cwebp.c
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@ -1093,20 +1093,6 @@ int main(int argc, const char *argv[]) {
if (print_distortion >= 0) { // print distortion
static const char* distortion_names[] = { "PSNR", "SSIM", "LSIM" };
float values[5];
if (picture.use_argb != original_picture.use_argb) {
// Somehow, the WebPEncode() call converted the original picture.
// We need to make both match before calling WebPPictureDistortion().
int ok = 0;
if (picture.use_argb) {
ok = WebPPictureYUVAToARGB(&original_picture);
} else {
ok = WebPPictureARGBToYUVA(&original_picture, WEBP_YUV420A);
}
if (!ok) {
fprintf(stderr, "Error while converting original picture.\n");
goto Error;
}
}
if (!WebPPictureDistortion(&picture, &original_picture,
print_distortion, values)) {
fprintf(stderr, "Error while computing the distortion.\n");
@ -1114,13 +1100,8 @@ int main(int argc, const char *argv[]) {
}
if (!short_output) {
fprintf(stderr, "%s: ", distortion_names[print_distortion]);
if (picture.use_argb) {
fprintf(stderr, "B:%.2f G:%.2f R:%.2f A:%.2f Total:%.2f\n",
values[0], values[1], values[2], values[3], values[4]);
} else {
fprintf(stderr, "Y:%.2f U:%.2f V:%.2f A:%.2f Total:%.2f\n",
values[0], values[1], values[2], values[3], values[4]);
}
fprintf(stderr, "B:%.2f G:%.2f R:%.2f A:%.2f Total:%.2f\n",
values[0], values[1], values[2], values[3], values[4]);
} else {
fprintf(stderr, "%7d %.4f\n", picture.stats->coded_size, values[4]);
}