11–20 of 230 posts
Earlier quoted context omitted.
Thank you! I hope you now share my feeling of awe over this technical wonder.
Excellent! :) It would be really cool to further extend it showing actually how the various tiles are encoded and between frames, something along the lines of: http://jvns.ca/blog/2013/10/24/day-16-gzip-plus-poetry-equal... H.265 can even do deltas between blocks in the same frame, IIRC, and is excellent for still image compression too.
Don't know in photoshop, but in Gimp there's a plugin called "wavelet decomposer" that does that.
The fair coin flip is also an example of a process that cannot be compressed well at all because (1) the probably of the same event happening in a row is not as high as for unfair coins (RLE is minimally effective) and (2) the uniform distribution has maximal entropy, so there is no advantage in using different code lengths to represent the events. (Since the process has a binary outcome, there is also nothing to gain in terms of code lengths for unfair coins.)
I wonder if across a lot of videos, the frequency domain representations look similar and if instead of masking in a circle we could mask with other (pre-determined) shapes to keep more information (this would require decoders to know them, of course). Or maybe this article is too high-level and it's not possible to "shape" the frequencies.
Yes, I've dumbed it down in the article to a simple circle to illustrate the point.
This was a good and interesting read. Is h.264 an open standard ?
> H.264 is protected by patents owned by various parties. A license covering most (but not all) patents essential to H.264 is administered by patent pool MPEG LA.[2] Commercial use of patented H.264 technologies requires the payment of royalties to MPEG LA and other patent owners. MPEG LA has allowed the free use of H.264 technologies for streaming internet video that is free to end users, and Cisco Systems pays royalties to MPEG LA on behalf of the users of binaries for its open source H.264 encoder.
I thought I'll learn something special about H.264, but all information here is high level and generic. For example if you replace H.264 with a much older technology like mpeg-1 (from 1993) every sentence stays correct, except this: "It is the result of 30+ years of work" :)
Still, it's a good overview of generic video compression.