| 摘要 |
The present invention is related to video and still-image compression systems. It addresses the problem of the occur-rence blurry edges in images exposed to conventional decod-ing and coding process. The present invention provides a method allowing some 'leakage' of edges and high-frequency content from the full-resolution luma-channel into the low-resolution chroma channels. It is adjusted to operate on parts of a image to be decoded (blocks, lines etc), to in-vestigate the conformity between the available decimated chroma-information with decimated luma-information. If a good fit can be found, i.e. appropriate parameters can be determined to express decimated chroma values with deci-mated luma values, those parameters are applied on the full-resolution luma values for obtaining estimated full-resolution chroma values instead of interpolation. If a good fit cannot be found, the full-resolution chroma values will gradually deteriorate to a standard fallback method interpolation method. This process is repeated for the en-tire picture and for each chroma-channel. |
