[theora] NHW Image codec - 2 lower quality settings

Raphael Canut nhwcodec at gmail.com
Sun Jun 9 09:09:31 PDT 2013


Just a quick message to let you know that I have improved my algorithm.Now,
I apply the post-processing function of the decoder on the 512x256 wavelet
image (half wavelet synthesis) rather than on the whole 512x512
reconstructed Y comp.Results (on all quality settings) seem to be visually
better, more neatness and more precision (this is also -slightly- confirmed
with PSNR).

So after few tests, I have updated the demo page with this new version.Any
comment is welcome.


2013/5/29 Raphael Canut <nhwcodec at gmail.com>

> Hello,
> I have finally added 2 lower quality settings for the NHW codec: -l1
> (-5Ko) and -l2 (-10Ko).I use a quantization of 0.935 and 0.88 (kind of
> quantization), and I decrease residual coding on the first order wavelet
> image.
> I have updated the demo page: http://nhwcodec.blogspot.com/ .
> These 2 lower quality settings are still experimental.If you could find
> time, would be interested in any opinion on this approach, and if it could
> be acceptable or not? Because lower quality settings seem quite difficult
> with my algorithm... -I prefer not remove higher wavelet coeffs for these 2
> settings...-
> Many thanks,
> Raphael
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