search for: 10ko

..., and SPIHT is certainly a very good algorithm for that, -and I know there are SPIHT experts that can make very good SPIHT-based codecs-.I have chosen a new and different approach, the multistage residual coding, so I will try to keep it and get the best of it. I estimate that I need an additional 10Ko in average to code low contrast information (and avoid artifacts).So I will need to remove 10Ko of information in high contrast and give it to low contrast.I think in a first time, I will only use residual coding for the low contrast area errors.I will try to do this next month if I can find time,...

Hello, Just a very quick message to let you know that I have added a higher quality setting (-h2, +10Ko) and I have added now residual coding on the 512x256 wavelet image for the higher settings.Precision is a little better.-I also still apply the post-processing function on the 512x256 wavelet image for now.- Here is the link for the binaries (as I can not link them in my blog for now): https://doc...

Hello, I was testing quickly some other lower quality settings -l3, -l4 because high compression is what really lacks to the NHW codec. In fact I can remove -5Ko of residual coding on Y,U,V comps for -l3 and I can remove -10Ko always of residual coding for -l4, and -l3, -l4 settings will be really better than the current ones implemented. I can also increase the wavelet coefficients threshold (of the dead zone), currently it is 8, can increase to 9,10,11,12,... according to the compression wanted.The problem with this o...

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 o...

...tropy coding scheme be required to encode the prediction residuals effectively, as my codec does not use it? Many thanks, Raphael 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 > t...