Television – Image signal processing circuitry specific to television – Motion dependent key signal generation or scene change...
Patent
1995-06-19
1997-04-01
Au, A.
Television
Image signal processing circuitry specific to television
Motion dependent key signal generation or scene change...
348419, 348415, H04N 736
Patent
active
056171501
ABSTRACT:
A video bit rate control method. SUBGOPs are defined as sets of two to four frames in a GOP. For example, if the GOP comprises IBBPBBPBBPBB frames, each of the SUBGOPs is defined as a set of the IBBP or BBP frames. Before bit assignment is performed with respect to frames to be coded, it is checked whether a scene change is present with respect to frames in successive ones of the SUBGOPs. If it is checked that the scene change is not present, a bit rate is controlled in a conventional manner. In the case where the scene change is present, a smaller bits than that in the conventional manner is assigned to frames with no scene change and a relatively large bit amount is assigned to a frame with the scene change. Therefore, according to the present invention, the video bit rate control method has the effect of preventing a degradation in a picture quality due to the scene change.
REFERENCES:
patent: 5231484 (1993-07-01), Gonzales et al.
patent: 5506686 (1996-04-01), Auyeung et al.
patent: 5532746 (1996-07-01), Chang
"A Bit Rate Control Approach for Hybird DPCM/DCT Video Coding." Limin Wang.
"Video Coding with Adaptive Quantization and Rate Control." C. Horne and A. Puri, SPIE, vol. 1818 Visual Communications and Image Processing '92. pp. 798-806.
Ahn Chie T.
Lee Young S.
Nam Jae Y.
Park Sang G.
Au A.
Electronics and Telecommunication Research Institute
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