Picture encoding method, picture encoding apparatus, picture tra

Details Picture encoding method, picture encoding apparatus, picture tra Picture encoding method, picture encoding apparatus, picture tra

1996-12-27

2000-05-02

Tung, Bryan

Television

Image signal processing circuitry specific to television

Motion dependent key signal generation or scene change...

348699, 348416, H04N 514

Patent

active

060578939

ABSTRACT:
A picture encoding method in which an input picture signal is encoded in a pre-set sequence by one of a plurality of encoding modes including at least the intra-frame coding and forward predictive coding for generating encoded data including intra-frame coded picture and forward predictive-coded picture. The scene changes in the input image signals are detected, the forward predictive-coded image directly after a detected scene change is changed to an intra-frame coded image, while at least one of intra-frame coded pictures before and after the detected scene change is changed to a forward predictively coded image. This prohibits the picture from becoming degraded in quality due to scene change. In addition, the intra-frame coded picture with a significant amount of the encoding bits may be prevented from being increased in number so that the amount of the transmission of the information may be prevented from being increased thereby improving the picture quality with minimum effect on bit allocation such as variable rate bit allocation.

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