Open-source PSNR/ SSIM C implementation without OpenCV? [closed]

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Is there any open source C implementation for PSNR, SSIM or MSE that doesn't rely on OpenCV?

Thanks.

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IQA provides a C implementation with no dependencies of the following image quality metrics:

• MSE
• PSNR
• SSIM
• MS-SSIM
• MS-SSIM*

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Google's WebM project provides these calculations in the libvpx library. Specifically in the VP8 encoder.

Then there is also NetPBM, FFMPEG and the x264 Project.