| 摘要 |
In a movement compensation predictive encoder, a vector detector (19) is supplied with a moving picture signal and produces a movement vector signal representative of at least one movement vector for each region of each frame. A picture analyzer (16) serves as a variation detector for detecting a variation in each region to produce a variation signal when the variation exceeds a predetermined threshold in one of the regions. The variation signal is used in giving a predetermined value, such as zero, to the above-mentioned at least one movement vector for that one of the regions. In place of the variation detector, a scene change detector can likewise be used to produce a scene change signal for giving a predetermined value to the movement vectors for a frame for which a scene change is detected. The scene change detector is preferably operable on a summation for each frame of results of evaluation for movement compensated prediction errors rather than, as in prior art, for differences between picture elements of two consecutive frames. |
