| 摘要 |
PURPOSE:To attain excellent picture transmission even in a scene change by detecting and processing the scene change based on a difference between a preceding and a current picture frame. CONSTITUTION:An input picture data is stored in a frame memory 19 and outputted to a subtractor 20 when a succeeding frame is inputted. A difference between a preceding and a current picture is obtained and a scene change detection section 21 detects the production of the scene change from the difference based on a prescribed processing condition. When any scene change is detected, a step size decision section 18 revises step sizes Q1, Q2 at each of quantization circuits 5, 7 by a prescribed amount and applies coding to the result. Thus, it is improved that a defect is caused due to an excess code quantity at the scene change. |
