-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Hi Steinar, Thomas,
I saw your new constrained low pass filter draft for Thor and decided to start experimenting with it. Putting the filter in Daala, I saw a PSNR bd-rate improvement around 2.1% in the 0.05 bpp to 0.1 bpp range over our ntt-short1 test set (I disabled our deringing filter for this comparison to avoid the interactions). However, I was unable to see improvements of 4-7% like you are reporting in the draft. Of course, it's quite likely that I messed up the implementation or the adaptation to Daala. It's also possible that somehow Daala cannot benefit from the CLP as much as Thor does. This is the code I wrote for filtering a small block of pixels: https://pastebin.mozilla.org/8850049 I've had to do some adaptation since the Daala pixels are shifted up by 4 at the point where we're applying the filter. Does this look correct to you? The other experiment that would be nice to try is using the Daala deringing filter in Thor. In Daala, our deringing filter is improving PSNR bd-rate by about a 6.5% in the 0.05 bpp to 0.1 bpp range. The deringing filter is documented in this IETF draft: https://tools.ietf.org/html/draft-valin-netvc-deringing-00 or (for those who don't like ASCII equations) in this pdf: http://jmvalin.ca/notes/dir_dering.pdf I uploaded some still image examples at: http://jmvalin.ca/video/deringing_examples/ Any interest in trying the Daala deringing filter in Thor? Cheers, Jean-Marc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJWJ/6NAAoJEJ6/8sItn9q9vUMIALcD8AZ2D7HM02qTYGMphnBx 4MG8J3s5eZmRahp1+pSy3soXS95fmJAbj1k4m/PmL3MrvxIlna7fLsLSygbD6MVs k3dlYRVDg/blCVGVA1GreynvQNpaGYmUphRyvFgAzZdx8g6/nU+2uhGQ+vY6qk1a yjniHvysne6m72r05hJIXk5gFj3HxaXtSC4phz43tWQ5EVwrMva+cM1JfST4fOxP 1KxlJ445GtJW6T+gu3PcAWtU4MuZ5H93rVm32+icv+485fCVh/xVBTjwdyskbSk5 iLtQL05WXShe8O81/LgqUQMdc7QMmvmlUgRYAGt52FzZ47G0LWA9bkcSn/oiMaE= =ooSR -----END PGP SIGNATURE----- _______________________________________________ video-codec mailing list [email protected] https://www.ietf.org/mailman/listinfo/video-codec
