| 摘要 |
This coding process makes it possible to reduce the information quantity of a television picture. A coding device comprises: a device for detecting the high brightness gradient points; a device detecting, from among the blocks formed from among four consecutive picture points so-called high gradients blocks containing at least one high gradient point; a device for coding points of the high gradient blocks, which carries out a differential coding of the brightness values and a quantification in accordance with a first non-linear scale; a device for coding points of low gradient blocks, which carries out a differential coding and a quantification in accordance with a second non-linear scale, the coding only being carried out for alternate points of the low gradient blocks, a device for decoding points of the high gradient blocks, and a device for decoding points of the low gradient blocks, the brightness values of the uncoded points of the low gradient blocks being reconstituted by linear interpolation on the basis of the decoded brightness values of adjacent points.
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