| 摘要 |
With known methods for predictive decorrelation this decorrelation only applies to one or more previously scanned elements of the same picture line. In accordance with the invention a picture to be scanned is divided into sub-pictures wherein a number of picture lines equal to the number of lines comprised in a sub-picture is intermediately stored in shift registers, a processing circuit being connected to the last stages of these shift registers, which processing circuit multiplies the values of the picture elements of one sub-picture with the same number of coefficients stored in the processing device and which adds the products. In a preferred embodiment the difference values obtained in this manner are also decorrelated in a second stage, the matrix of the difference values being divided into difference value sub-pictures which are shifted, preferably diagonally, relative to the original sub-pictures. A considerably larger surrounding area of each picture element is thus involved in the prediction.
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