<div dir="ltr"><div>Hello,</div><div> </div><div>Definitely not any (constructive) comments on the NHW Image codec?</div><div> </div><div>According to my tests, it can compare good with reference codecs like x264 intra and WebP.</div>
<div> </div><div>Yes, the codec is still experimental and is optimized for visual (subjective) evaluation, not PSNR.Its main feature is again that it would have a little more neatness/sharpness and a little less precision (residual coding is applied on "sub" wavelet images or orders and I take advantage then of the neatness the wavelet 5/3 filterbank can have).The entropy coding schemes for each parts: wavelet coefficients, residuals, are also near optimal as with the best (binarization +) context modeling + arithmetic coders, except for the DC parts where the compression scheme is not optimal, can win 0.7Ko per file in average with the best arithmetic coders.</div>
<div> </div><div>The NHW codec is also (really) faster in return, -it also uses a "direct" discrete wavelet 5/3 transform which is very fast, also associated with a fast segmentation algorithm-.</div><div> </div>
<div>So I would have been really interested to have some opinion about the performance and limitations of the NHW algorithm? Any comment from the Xiph core members on the NHW algorithm? If you could find time, do you plan to study the NHW algorithm deeper, or not? -I would also understand that you could not find time and/or could not go further with it, would also help me to know if I put it on pause for now-.</div>
<div> </div><div>Many thanks again,</div><div>Raphael</div><div> </div><div> </div></div>