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correct PSNR metric

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Cristy
2025-05-02 10:25:36 -04:00
parent f039a8eae2
commit ea6e8e88e2
1 changed files with 3 additions and 2 deletions
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MagickCore/compare.c
+3 -2
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@@ -1254,7 +1254,7 @@ static MagickBooleanType GetPeakSignalToNoiseRatio(const Image *image,
((reconstruct_traits & UpdatePixelTrait) == 0)) ||
(i == CompositePixelChannel))
{
if (distortion[i] <= MagickEpsilon)
if (distortion[i] < MagickEpsilon)
distortion[i]=1.0;
else
if (distortion[i] >= 1.0)
@@ -3701,7 +3701,7 @@ static Image *PSNRSimilarityImage(const Image *image,const Image *reconstruct,
psnr_image=MSESimilarityImage(image,reconstruct,offset,similarity_metric,
exception);
if (*similarity_metric <= MagickEpsilon)
if (*similarity_metric < MagickEpsilon)
*similarity_metric=1.0;
else
if (*similarity_metric >= 1.0)
@@ -3709,6 +3709,7 @@ static Image *PSNRSimilarityImage(const Image *image,const Image *reconstruct,
else
*similarity_metric=10.0*log10(PerceptibleReciprocal(
*similarity_metric))/MagickPSNRDistortion;
*similarity_metric=1.0-*similarity_metric;
return(psnr_image);
}