Patent ID: 6798836
Filing Date: 2004-09-28
Classification: H04N

Abstract:
A device for transmitting television pictures, comprising:means for dividing each television picture into blocks; means for forming motion vectors for said blocks; means for forming a reference vector and a plurality of difference vectors from the motion vectors of a plurality of contiguous blocks which form a sub-picture, the reference vector being the motion vector of any selected one of said blocks, and each difference vector being the difference between the motion vector of block and the motion vector an immediately adjacent block; and a variable-length encoder for encoding the difference vectors into code words of variable length, the motion vectors of a sub-picture being applied to the variable-length encoder in the form of a series which successively comprises the difference vectors and the reference vector, the variable-length encoder being of a type which allocates a code word of variable length to each sequence of zero values followed by a non-zero value in said series.