TELEVISIE-OVERDRACHTSYSTEEM MET HYBRIDE KODEERSCHAKELING.

摘要

In a television transmission system each picture is subjected to a number of picture transforms for limiting the bit rate. In each picture transform the picture is partitioned into sub-pictures of a given size. The sub-picture size is different for the different picture transforms. Each sub-picture is converted into a limited number of predetermined coefficients by means of a sub-picture transform. This number is related to the sub-picture size. With the matrix of coefficients thus obtained for each picture an approximation of the original picture is made by means of an inverse transform and this approximation is subjecrted to one of the said forward transforms. The matrix of coefficients now obtained is subtracted from this matrix of coefficient which is obtained by subjecting the original picture to the same forward transform.