| 摘要 |
<p>A high definition television signal from a source such as a television camera (1) is applied to three parallel processing branches the operation of each branch being determined by a range of motion. An 80ms branch (3, 4, 5) and a 20ms branch (6, 7, 8) each respectively have a two dimensional low pass filter, a sub-sampler and a line shuffler. A 40ms branch (9,10) only has a two dimensional filter and a sub-sampler. A motion estimator (14) determines the degree of movement of picture blocks and a decision unit (13) decides on the appropriate branch, the motion vectors for the 20ms and 40ms branch and the blocks to which these are applied. This information is applied to a DATV formatting device (15) which produces a menu of motion vectors and codewords for each block. A switch (11) selects the appropriate branch for each block.</p> |
