similar to: NHW Project - lower quality settings

I don't mind at all. I imagine there are more people like me out there who have been following your work, but haven't said anything. I agree that a series of pages explaining how things work may lead to more contributions. At the very least it would lead to more people being better educated on how wavelets work in image compression. But, this is your project, if you don't have the

Hi David! Many thanks for your very encouraging and kind feedback!!! (Hope you don't mind that I made your post public on the Theora channel). I try to be the more sincere as I can in my posts.Some people suggested me to make demo pages to explain how the codec works step by step, and I realize that it would be good, because certainly it will show that the NHW codec is not that complex and

Hello, So thanks to helpful forum feedbacks, I know now that I have to create a website for the NHW Project, make demo pages of the technology, and all that with good visual design.It won't be such easy for me... For example, I can easily supply a description, explanation of the different steps of the algorithm, I can supply images encoded at mid-compression with NHW, x265, WebP, JPEG,...

Hello all, Finally find some time to get back to the NHW Project.I was thinking about making a technology demo, and I wanted to highlight the uniqueness of the NHW codec that is neatness/sharpness preserving or enhancement.With my eyes, I can see that the NHW codec has more neatness/sharpness than the other codecs (x265, x264, WebP, Rududu, JPEG,...), but for a demo there must be objective

Hello, In my last post, I seemed to say that there were no directional wavelet transforms that would give improvement to the NHW codec, but are directional wavelets an active research field today? I have also seen some recent patents on advanced and improved SPIHT, and I am a little surprised that there is no "up-to-date" state-of-the-art wavelet codec.Rududu in April 2008 was the last

Hello, I have just tested new next lower quality settings (-l3 and -l4), I can diminish residual coding but if I increase wavelet coeffs threshold there is more aliasing.And even in the current mid quality settings there is some aliasing, this is the big drawback of the NHW codec. SPIHT algorithm is good for that as for example Rududu codec doesn't have aliasing at all at mid compression and

Hello, I would like to thank very much the Theora channel community for their support and help!!! And even recently a Theora channel member proposed me to freely host on his server the NHW Project website, to present the codec on the embedded processors, MCU forums that he knows well, another member forked my GitHub repository!!! Really thank you very much!!! It makes me think that maybe the NHW

Hello, With -l5 quality setting, I have learned that I can increase wavelet coeff threshold to 12 in the HH band without noticeable difference in the reconstructed images.With this processing, I win in average 1Ko in the compressed .nhw files, and so I can raise the quantization for -l1->-l4 settings (0.935->0.955,0.88->0.9,0.87->0.89) and so these settings are now better, there is a

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

Hello Ken, Many thanks for your reply! Yes, I very need to adapt the NHW codec to any image size.But actually it is the least interesting part, I don't think that it is that difficult (compared to creating high compression settings) but it is very boring, annoying... Really not the part that I prefer... For now, as I am jobless, my aim is to have "pleasure" with the NHW Project and

Hello Spork, > If you want though, when I find some time, I can work on supporting a better command line parsing. Yes that would be great as my command line parsing is not good at all. > Does your codec compile under Linux? If not, that's something I can try to work on as well. I never tested my codec under Linux )-:, and so it would be also great to compile it under Linux.I think

Hello, Just a quick message to let you know that I have really improved very high compression of the NHW Project from -l8 to -l13 quality settings, and we can still save 2.5KB per .nhw compressed file. Actually I am new to very high compression, it is just 3 months that I am working on it (I put on pause the NHW Project from August 2013 to February 2018 )... And I realize that very high

Hello, I don't have really advanced on -l5 and -l6 high compression settings, but I know what bits to remove while still keeping a good image neatness/sharpness, I just need to translate these ideas into lines of code, which is not that easy... I realize now that the NHW Project was really lacking high compression settings, and now that I have started to add high compression, it really gives

Hello, For those interested, I have added a -l4 high compression setting to the NHW codec ( http://nhwcodec.blogspot.com/ ).This setting is very experimental, I have boosted the sharpness for this one, but it can lack of precision on low contrast areas. This setting still maintains a good neatness and when it will be validated, I will then make a new 0.1.4 version for the NHW Project. High

Hello, I've found some time to get back to the NHW Project.In fact a Xiph forum member told me that even if I will start a new job, he hopes that I will still continue to develop a little the NHW Project, on my spare time.I told him that I would furthermore spend my spare time on the NHW Project if a community around the project could emerge... and he told me that certainly the best way for

Hello, I would like to discuss a little about the NHW codec and its state after nearly 5 years on the Xiph forums. I also know that if I would like to discuss I'd better go to the great Doom9 and Encode.ru forums but for now I find that my codec is too experimental for these professional forums: - the codec is only for fixed 512x512 size, just a test tool. - there is only mid compression -

Hello, I have some progress for the NHW codec. I recently talked with a researcher that has some interest in the NHW codec.He has studied several directional wavelet transforms (notably HWD directional transform), and he came to the conclusion that directional transforms will bring marginal improvement, not significant in the case of my compression codec.This also confirms what I have read from

Hello, Definitely not any (constructive) comments on the NHW Image codec? According to my tests, it can compare good with reference codecs like x264 intra and WebP. 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

Hello, I have improved quality for -l3,-l4,-l5 settings.I have diminished residual coding and I have raised again quantization.These settings are now better. Update at: http://nhwcodec.blogspot.com/ The NHW Project with this version starts to be competitive at high compression with x265. Any feedback welcome! Cheers, Raphael -------------- next part -------------- An HTML attachment was

Hello, Yes, that's right, I had the remark that if I say that the NHW codec would have more neatness/sharpness, this must be also accompanied with objective measure.But the neatness/sharpness measure is quite complex to define, and implement. But at classical visual review step, I would find that the NHW codec would be less blurred (maybe PSNR would like blur?...) with more