As early as 1929, Ray Davis Kell described a form of video compression and was granted a patent for it. He wrote, "It has been customary in the past to transmit successive complete images of the transmitted picture. [...] In accordance with this invention, this difficulty is avoided by transmitting only the difference between successive images of the object." Although it would be many years before this technique would actually be used in practice, it is still a cornerstone of many video compression standards today. It's the reason why video using MPEG can be compressed roughly a factor of 10 better than JPEG-compressed still images.
What technique can provide another magnitude of improvement in video compression?
My prediction is that we need to change focus from optimizing for best peak signal to noise performance to optimizing for psycho-visual perception. I.e. "how good do the compressed images look" instead of looking at minimizing the mathematical difference between the original and compressed imagery.
March 4, 2008
Perfect pixel patent
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2 comments:
Are you now talking about compression artifacts removal or a total new compression technology?
Perhaps you can talk to Roel Pieper, he supposed to have a nice device.
I believe new video compression standardization efforts should move away from using PSNR as their quality metric. PSNR is not a good predictor of the perceived video quality that a human experiences.
I can recommend the book "De Broncode" by Eric Smit, where the whole story behind the device that compresses a whole movie to 8KB is outlined. It's a great read and fascinating to see that so many smart and high level people got fooled.
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