search for: 5ko

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 9,10,11,1...

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 int...

...> results start to be not good and lack of precision.So for now, I > recommend > > to use -l4 setting on well-defined, good quality images. > > > > I have also "simply" increased the wavelet coeff threshold of the > dead-zone > > for -l5 setting (to save -5Ko), but the quality drop is too big for > now.The > > other codecs (above) don't have that drop in quality from -l4 to -l5 > > compression.So apparently, there needs to be more smartness to pass from > -l4 > > to -l5 with the NHW codec.I'll try to work on this, but it&...

Hello, I have improved a little the NHW codec.I have improved the dequantization in the wavelet HH band, and little improved the -l2 (and lower) quality setting.I have also added a -l3 lower quality setting (-15Ko, exp), I have increased the quantization for this other setting, and I start to remove higher wavelet coefficients, but this is not optimal... The artifacts start to be noticeable for some images at -l3 setting (even if the neatness would be still good...), really need to better modelise the wavele...

...rred images where there is no neatness to enhance, the results start to be not good and lack of precision.So for now, I recommend to use -l4 setting on well-defined, good quality images. I have also "simply" increased the wavelet coeff threshold of the dead-zone for -l5 setting (to save -5Ko), but the quality drop is too big for now.The other codecs (above) don't have that drop in quality from -l4 to -l5 compression.So apparently, there needs to be more smartness to pass from -l4 to -l5 with the NHW codec.I'll try to work on this, but it's extremely complex, for me...For ex...

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):

...and lack of precision.So for now, I >> > recommend >> > to use -l4 setting on well-defined, good quality images. >> > >> > I have also "simply" increased the wavelet coeff threshold of the >> > dead-zone >> > for -l5 setting (to save -5Ko), but the quality drop is too big for >> > now.The >> > other codecs (above) don't have that drop in quality from -l4 to -l5 >> > compression.So apparently, there needs to be more smartness to pass from >> > -l4 >> > to -l5 with the NHW codec.I'l...