| 摘要 |
<p>Improved RGB to YUV conversion with chroma downsample process that happens at the first stage of many (most) image and video compression techniques provides a measurably better quality than the standard conversion by exploiting the fact that decompressors saturate the output RGB values back into their allowed ranges to thereby optimize the intermediate lower resolution color values. Example non- limiting implementations output results equal or nearly equal to the standard conversion when the latter performs well, has a computation cost that is less than a few times the standard conversion's computation cost so as to allow its implementation in similar hardware, reaches a quality level close to that of the full brute force optimization, and applies to all quasi affine colorspace conversions with chroma downsampling.</p> |
