Raphael Canut
2018-Mar-17 22:09 UTC
[theora] NHW Project - quality improvement - proper subband quantization
Hello, I have improved quality for -l1->-l4 settings.I have properly set up the wavelet coeff threshold of the dead-zone according to the different wavelet subbands, I have then saved another 1Ko per .nhw files without noticeable difference and so I have raised again the quantization.The reconstructed images have now a better precision and still a good neatness. Update at: http://nhwcodec.blogspot.com/ Else I realize that JPEG XR (2009) and WebP (2011) are quite good codecs, they are backed furthermore by big companies Microsoft and Google, they claim and guarantee that their codecs are royalty-free, and so if at the moment of their release in 2009 and 2011, they didn't succeed in replacing JPEG, I can not see why today the NHW codec that is globally on par with them will succeed in doing so.Could be even seen as unfair... So it is nearly impossible for the NHW Project to penetrate the market, except maybe for devices that have a microcontroller, low power processor <400Mhz, and where speed is a critical and imperative need, because the NHW codec is very faster than these codecs.I will maybe look on this side in the next days... If you have time, let me know about the quality improvement! Cheers, Raphael -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.xiph.org/pipermail/theora/attachments/20180317/2e347f00/attachment.html>