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SSIM measurement is usually the smallest SSIm index, so report that instead of MSSIM, but if the user wants SSIM we can do that, too.

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This commit is contained in:
Pavel Krajcevski 2013-10-11 13:06:29 -04:00
parent 2d8c291107
commit 855683983c
3 changed files with 23 additions and 6 deletions
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2
Base/include/Image.h
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@ -106,7 +106,7 @@ namespace FasTC {
}
double ComputePSNR(Image<PixelType> *other);
double ComputeMSSIM(Image<PixelType> *other);
double ComputeSSIM(Image<PixelType> *other, double *mssim = 0);
// Function to allow derived classes to populate the pixel array.
// This may involve decompressing a compressed image or otherwise

22
Base/src/Image.cpp
View File

@ -238,7 +238,7 @@ static Image<PixelType> FilterValid(const Image<PixelType> &img, uint32 size, do
}
template<typename PixelType>
double Image<PixelType>::ComputeSSIM(Image<PixelType> *other) {
double Image<PixelType>::ComputeSSIM(Image<PixelType> *other, double *mssim) {
if(!other) {
return -1.0;
}
@ -361,7 +361,11 @@ double Image<PixelType>::ComputeSSIM(Image<PixelType> *other) {
}
}
double mssim = 0.0;
double minSSIM = 1.0;
if(mssim) {
*mssim = 0.0;
}
for(uint32 j = 0; j < h; j++) {
for(uint32 i = 0; i < w; i++) {
double m1sq = static_cast<float>(mu1_sq(i, j));
@ -372,13 +376,23 @@ double Image<PixelType>::ComputeSSIM(Image<PixelType> *other) {
double s2sq = static_cast<float>(sigma2_sq(i, j));
double s1s2 = static_cast<float>(sigma12(i, j));
mssim +=
double ssim =
((2.0 * m1m2 + C1) * (2.0 * s1s2 + C2)) /
((m1sq + m2sq + C1) * (s1sq + s2sq + C2));
if(mssim) {
*mssim += ssim;
}
minSSIM = ::std::min(ssim, minSSIM);
}
}
return mssim / static_cast<double>(w * h);
if(mssim) {
*mssim /= static_cast<double>(w * h);
}
return minSSIM;
}
// !FIXME! These won't work for non-RGBA8 data.

5
Base/test/TestImage.cpp
View File

@ -164,5 +164,8 @@ TEST(Image, ComputeMSSIM) {
}
}
EXPECT_EQ(img.ComputeMSSIM(&img), 1.0);
double MSSIM;
double SSIM = img.ComputeSSIM(&img, &MSSIM);
EXPECT_EQ(SSIM, 1.0);
EXPECT_EQ(MSSIM, 1.0);
}