search for: psychovisu

...n important remark: we can really save 2.5KB in average per .nhw compressed file as the entropy coding schemes are not optimal, especially at extreme compression.I have the fast ideas to improve it.Will have to do it. More at: http://nhwcodec.blogspot.com/ I will have to study a little deeper the psychovisual model I use for extreme compression, because on 5% of the images, certain kinds of images, it is better to switch it off... Again, it would be great if you could consider the NHW Project as furthermore it is royalty-free and ultra-fast, I know it is impossible to compete with VP9,HEVC, AOM AV1,...

Hello, I have (slowly) worked these last couple weeks on the psychovisual model of NHW because some people reproach me that it washes details out... so I restored a little more details but this consumes some bits and actually it turned out that it also decreases neatness, and so when you compare at the same compression ratio, actually I find the current version visuall...

Hello, For those interested, I have released the 0.2.9.6 version of NHW.This new version has a better quantization based on psychovisual fine-tuning. More at: http://nhwcodec.blogspot.com/ As NHW is still extremely fast, I hope in 2023 it could find some interest within niche applications. Cheers, Raphael -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.xiph.org/pipermail/theora/a...

...the nhw_kernel weights.This new version has then more precision and a better visual quality. Normally this new version gains that little extra precision, so normally at -q14 setting, NHW should have a competitive precision, while still keeping its neatness. From -q12 to -q8 settings, there is the psychovisual model, for now this model is optimized for neatness, and it is maybe not totally precision's best friend in its current state... So for now high compression in NHW has a good/competitive precision and very high compression puts more forward neatness... More at: https://nhwcodec.blogspot.com/...

Hi all, I have to compare the theora codec with MPEG and H264. I was googling and I found that the PSNR is a common used parameter. How can I do this with Theora? Thanks -- Leonardo de Paula Rosa Piga Undergraduate Computer Engineering Student LSC - IC - UNICAMP http://www.students.ic.unicamp.br/~ra033956

Derf's from-scratch alternate implementation of the theora codec is now publicly available from our subversion repository. http://svn.xiph.org/experimental/derf/theora-exp/ This exciting new codebase promises superiour performance, and the encoder is capable of higher quality output than the current represenation, taking advantage of the bitstream extension we've added to the

Hi, is there a good concept to lower the quality of a Theora stream without completely reencoding it? For example to make a lower bitrate stream out of a higher bitrate stream on the fly on some sort of proxy server. I am thinking about something like requantization. If you think requantization is also the best (or the only) option for Theora please let me know. Kind regards, Franz

Hi, I was wondering what are this forum's collective thoughts on the best way to support video color fidelity greater than what we have today. I am not a video developer myself. I edit video. A type of problems I come across fairly often, have to do with the limited color depth of the digital video medium. They often manifest themselves as "cartoonish" areas of adjacent flat