| 摘要 |
PROBLEM TO BE SOLVED: To reduce an encoded data amount to be transmitted by adaptively significance-judging motion compensation residual signals and to control the encoded data amount to be transmitted to be fixed at all times by performing feedback buffering. SOLUTION: As for input image data, motion vector is detected by a block unit by block matching for instance with the locally decoded images of a frames in the past. By the motion vector of the block unit, motion compensation is performed to a previous frame, predicted images are prepared and a difference with the input image data is calculated. For the predicted residual, significance judgement is performed for respective blocks and the residual signals of the block judged as a significant block are quantized, then variable length encoded and supplied to a buffer circuit 11. A hierarchical branch to perform transmission is appropriately selected from the residual amount of the buffer circuit 11. |
