Comments by "Lawrence D’Oliveiro" (@lawrencedoliveiro9104) on "The Problem with JPEG - Computerphile" video.

  1. The term for those artifacts is “mosquitoing”. They are the image equivalent of “ringing” in digital audio.
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  2. Around about 1990, back when hard drives were a lot smaller and people still used floppies a lot, JPEG was an absolute revelation. The idea that you could take a photorealistic image and reduce the file size by a factor of 10 with no perceptible difference in image quality was stunning.
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  3. There is another problem with JPEG, and that is if you push the compression too hard even on images without sharp edges in them, it ends up looking blocky. There is another compression technique, known as “JPEG-2000”, that uses wavelets instead of DCT. Here when you push things too hard, it gets fuzzy rather than blocky, which many people feel is less objectionable.
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  4. 1:00 “High frequencies” i.e. image-processing-speak for “sharp edges”.
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