NHW Image codec - 2 lower quality settings

[Raphael Canut]

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

[Raphael Canut]

Hello,

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.

Raphael

Post by Raphael Canut
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