[theora] NHW Image codec - improvement of precision

Raphael Canut nhwcodec at gmail.com
Wed Aug 22 07:40:19 PDT 2012


Just a quick message to let you know that I have improved precision of my
codec (on the encoder and decoder).I have also updated 2 new test images on
my demo page...

I still don't have made an image comparison, but I have re-tested Google
WebP on more images, and WebP is very good.

Don't know what kind of interest projects like mine could have, but however
if you found time to take a quick look, any comment, suggestion,... is
still very welcome.

Many thanks,

2012/7/25 Raphael Canut <nhwcodec at gmail.com>

> Hi again,
> I have improved precision of my codec (on the encoder and decoder).I have
> also improved the -h1 quality setting.-Source code and binaries at
> http://nhwcodec.blogspot.com/ -.
> I am still trying to improve precision of my codec, with keeping my
> low-complexity (fast) approach.
> I do not totally use the reference (and impressive) block prediction with
> different modes + residual coding scheme, but I just apply residual coding
> on the first order wavelet "image" (for example for a 512x512 image, I just
> code the errors on the 256x256 wavelet "high-resolution" part), hence the
> lack of precision.I try to compensate it with a little more neatness of the
> wavelet 5/3 filterbank, but that's right that precision seems visually more
> important.
> Any opinion on this approach or on the codec in general is very welcome.
> Many thanks again,
> Raphael
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