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Make sure to take alpha into account when computing PSNR

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Pavel Krajcevski 2012-10-22 19:01:03 -04:00 committed by Pavel Krajcevski
parent 82e51a49cf
commit 1abc54cf21
1 changed files with 7 additions and 5 deletions
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12
Core/src/Image.cpp
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@ -80,15 +80,17 @@ double Image::ComputePSNR(const CompressedImage &ci) const {
const unsigned char *pixelDataRaw = m_PixelData + i;
const unsigned char *pixelDataUncomp = unCompData + i;
double dr = double(sad(pixelDataRaw[0], pixelDataUncomp[0])) * wr;
double dg = double(sad(pixelDataRaw[1], pixelDataUncomp[1])) * wg;
double db = double(sad(pixelDataRaw[2], pixelDataUncomp[2])) * wb;
double rawAlphaScale = double(pixelDataRaw[3]) / 255.0;
double uncompAlphaScale = double(pixelDataUncomp[3]) / 255.0;
double dr = double(sad(rawAlphaScale * pixelDataRaw[0], uncompAlphaScale * pixelDataUncomp[0])) * wr;
double dg = double(sad(rawAlphaScale * pixelDataRaw[1], uncompAlphaScale * pixelDataUncomp[1])) * wg;
double db = double(sad(rawAlphaScale * pixelDataRaw[2], uncompAlphaScale * pixelDataUncomp[2])) * wb;
const double pixelMSE =
(double(dr) * double(dr)) +
(double(dg) * double(dg)) +
(double(db) * double(db));
//fprintf(stderr, "Pixel MSE: %f\n", pixelMSE);
MSE += pixelMSE;
}