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by newpavlov
1771 days ago
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It makes sense not only from biological point of view as noted in the article, but also from technological as well. Almost all color cameras use Color Filter Arrays [1], meaning that for WxH resolution you don't get WxHx3 pixel values as you would expect from RGB images which you usually consume, but only WxH (i.e. 2/3rds of RGB image data is generated, not measured). With 4:4:4 sampling you have 12 values per 2x2 block, even though only 4 values have been measured by camera for it. Meanwhile with 4:2:0 sub-sampling you have 6 values, which is still bigger than 4, but quite convenient for processing in Y-based color spaces. [1]: https://en.wikipedia.org/wiki/Color_filter_array |
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