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NTIRE 2017 Super-Resolution Challenge - Track 1: Bicubic downscaling - x2 Forum

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> Evaluation Criterion

I was wondering whether the PSNR and the SSIM is evaluated on luminance channel only or colour channels are also included for evaluation.

Thank you in advance for clarifying this.

Best regards,
Junjie

Posted by: Jeffery @ March 3, 2017, 11:50 a.m.

PSNR and SSIM are evaluated over all color channels (R, G, B) and not on luminance channel.
SSIM is first computed for each R, G, B color channel and then averaged.

Best,
-Radu

Posted by: Radu @ March 3, 2017, 1:50 p.m.

Thank you!

Posted by: Jeffery @ March 3, 2017, 1:53 p.m.

Thank you for the clarification! Will the PSNR also be averaged or calculated for the 3 channels at once?

Posted by: sharabati @ March 17, 2017, 4:59 p.m.

PSNR is computed over all pixel values.
Here are the Matlab scoring functions:
http://www.vision.ee.ethz.ch/~timofter/software/NTIRE2017_scoring_functions.zip

Posted by: Radu @ March 18, 2017, 8:38 a.m.

Thank you!

Posted by: sharabati @ March 20, 2017, 5:19 a.m.
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