similar to: NHW Image codec - advice

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):

Hello, Ok that's right HEVC and AOM AV1 are better than the NHW codec, even at mid compression.I only tested my codec with quite neat images, hence the good results, but on more blurred, more compressed images, HEVC and AOM AV1 are definitely better, they are also exceptionnal at high compression. So, yes that's right, the NHW codec has very little chance to penetrate the market, it is

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 -

Hi again, I have improved precision of my codec (on the encoder and decoder).I have also improved the -h1 quality setting.-Source code and binaries at http://nhwcodec.blogspot.com/-. I am still trying to improve precision of my codec, with keeping my low-complexity (fast) approach. I do not totally use the reference (and impressive) block prediction with different modes + residual coding scheme,

Hello, I have re-tested -l4 high compression setting and it's clear that it lacks of precision on degraded, rather blurred images. So I don't know if it is a good idea to base the other lower quality settings (-l5,-l6,...) on -l4 setting.I have tested the NHW codec against x265, x264, Daala, WebP, Rududu, DLI and it's clear that at high compression these very good codecs have more

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

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

Hello, I am progressively getting back to the NHW Project development (but it is not that easy, I am a little depressed currently...). I realize what is needed for the NHW codec is more HF energy preservation, but as all the HF energy seems to require lot of bits, I wanted to select specifically the HF energy around blurred edges, in order not to have edges with aliasing.Is it possible to

Hello, I don't have worked on the NHW Project this past week (I also have to work on an other project) but I found time today to make an "extensive" testing of x265 (HEVC) and the NHW codec at high compression (-l7 setting). That's right that x265 is a very good codec! Really impressive.The NHW Project is not as good, it can only compete with x265 (HEVC) on quite high quality

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 all, It's me again.Just a quick message to tell that I finally do not agree that HEVC (don't have tested AOM AV1 for now) is better than the NHW codec at mid compression. Last night, I dowloaded 30 images of Star Wars Rogue One on the web and I made another comparison with x265 (HEVC) for mid compression (-l2 to h2 settings for the NHW codec). Visually, I prefer the results of NHW

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 interested in any

Hello, I am slowly working on the NHW codec. I have re-tested the post-processing function in the NHW decoder that was supposed to remove aliasing but that doesn't work at all, and after several tests I still find this post-processing useful.I find that it gives some good results, rebalances the image (but it is very slight).I know that this kind of post-processing must be taken very

Hello, Just a quick message to let you know that I have improved -l6 quality setting. This high compression quality setting is now competitive with x265 (HEVC).Actually I prefer -l6 high compression setting compared to x265 on many images (not blurred)... Update at: http://nhwcodec.blogspot.com/ Else, do some of you could test the NHW Project under Linux? Many thanks! Cheers, Raphael

Hello, Ok, I will post them in a folder on Google Drive and will give the link on my blog page, -because among other things, on my blog page, I can not display 2 bitmap 512x512 images side by side-... Hope it is ok! Cheers, Raphael 2018-07-15 1:41 GMT+02:00 J.B. Nicholson <jbn at forestfield.org>: > Raphael Canut wrote: > >> I downloaded 20 images from the Internet with

---------- Forwarded message ---------- From: Raphael Canut <nhwcodec at gmail.com> Date: 2017-11-30 14:22 GMT+01:00 Subject: Re: [theora] NHW Project - speed comparison with x265 To: fboehm <fboehm at aon.at> Hi Franz, Many thanks for your answer!!! > I appreciate your enthusiastic work on such a complex project like writing a video codec Yes, for now the NHW codec is more an

Hello, Just a quick message to let you know that I get back to NHW Project currently. I downloaded 20 images from the Internet with rather good quality (mainly faces), I compressed them at high compression -l7 setting with the NHW Project, and on 19 images out of 20, I visually prefer the results of NHW compared to x265 (HEVC)!!! -I can make available these 20x3=60 512x512 24bit bitmap images

Hello, Just a quick message to correct what I have said in my previous post.It finally seems not that easy to code small wavelet coefficients to have a good precision, and SPIHT is certainly a very good algorithm for that, -and I know there are SPIHT experts that can make very good SPIHT-based codecs-.I have chosen a new and different approach, the multistage residual coding, so I will try to

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 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