| 摘要 |
<p>PURPOSE:To improve encoding efficiency by giving a scan order generating the string of invalid data which is sufficiently long for a signal including the discontinuous point of an edge and the like in a picture signal in subband encoding. CONSTITUTION:Respective frequency bands are not separately encoded but they are sample point-scanned. The sample points in respective frequency bands have hourly or spatial positions which the signal expresses on an original signal. Down sampling circuits 200-203 and a scanner 400 are provided for scanning the sample points expressing the same position or the adjacent position on the original signal so that they can continue as much as possible. In a part excluding the velocity of the discontinuous point of the edge signal and the like, a part which hardly affects decoding picture quality continues even if encoding is executed near a zero level by scanning, and therefore encoding is efficiently encoded by a run length signal converter 610 and an encoder 320.</p> |
