The MS-SSIM calculation of the video compression track

[li ming]

Dear Organizer,  

i noticed that the evaluation metric of the video compression track is MS-SSIM, but it doesn't provide more specific calculation of MS-SSIM.

Is the original PNG and reconstructed PNG of Y,U and V components used to calculate MS-SSIM? Could you please provide the script of MS-SSIM calculation?

Best regards,

gang

[Lucas Theis]

Hi Gang,

I attached the code that's used to evaluate submissions. The function `evaluate()` in `metrics.py` receives two dictionaries containing paths to the target PNGs and decoded PNGs. In the video challenge, these are the PNGs representing Y, U, and V channels. One thing to note is that the MS-SSIM is weighted by the number of pixels, so Y is weighted more strongly than U or V.

Lucas

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