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> It's why video compression is very different from image compression. Is it? I was under the impression that I-Frames in current video compression formats are
by dahauns 10y ago
> It's why video compression is very different from image compression.
Is it? I was under the impression that I-Frames in current video compression formats are encoded rather similarily to current still image formats. (JPG's comparable lack of sophistication notwithstanding, but c'mon, it's old. :) )
- willvarfar 10y agoIndeed! The current trend is to compress still images as single-frame movies, e.g. webp.
- sp332 10y agoUsually I-frames are a small minority of the frames. Most frames encode motion information. So the decoder takes picture data from previous frames and moves it according to the motion vectors. Then, if the result was deemed too inaccurate by the encoder, there will be a little more picture data for the current frame. Having accurate motion vectors is more important than having perfect color reproduction.