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fix issue 9359

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This commit is contained in:
Steven Puttemans 2017-08-14 16:16:04 +02:00
parent 6b2510d312
commit bdcb81e81e
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doc/tutorials/videoio/video-input-psnr-ssim/video_input_psnr_ssim.markdown
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@ -133,7 +133,7 @@ Then the PSNR is expressed as:
\f[PSNR = 10 \cdot \log_{10} \left( \frac{MAX_I^2}{MSE} \right)\f] \f[PSNR = 10 \cdot \log_{10} \left( \frac{MAX_I^2}{MSE} \right)\f]
Here the \f$MAX_I^2\f$ is the maximum valid value for a pixel. In case of the simple single byte image Here the \f$MAX_I\f$ is the maximum valid value for a pixel. In case of the simple single byte image
per pixel per channel this is 255. When two images are the same the MSE will give zero, resulting in per pixel per channel this is 255. When two images are the same the MSE will give zero, resulting in
an invalid divide by zero operation in the PSNR formula. In this case the PSNR is undefined and as an invalid divide by zero operation in the PSNR formula. In this case the PSNR is undefined and as
we'll need to handle this case separately. The transition to a logarithmic scale is made because the we'll need to handle this case separately. The transition to a logarithmic scale is made because the