| 摘要 |
<p>PROBLEM TO BE SOLVED: To keep quality of an image obtained by applying compression coding to borders of plural scenes in timewise direction. SOLUTION: When no scene change takes place in edit video data, predicted difficulty data D'16 -D'30 are calculated based on generated real difficulty data D1 -D15 and object data quantity, is calculated. On the occurrence of a scene change, A coefficient based on a ratio of values of real difficulty data for each picture type is multiplied with first real difficulty data D15 of a last scene and a constant denoting a margin to expect increase in a data amount of a B picture is added and a total sum of difficulty data is predicted and the object data quantity is calculated. Moreover, based on the real difficulty data of the B picture obtained newly, the constant above is corrected. Finally the object data quantity is calculated in a stage that a prescribed number of real difficulty data is obtained by returning to the same method as the case with no scene change.</p> |
