Television – Image signal processing circuitry specific to television – Motion dependent key signal generation or scene change...
Patent
1994-10-26
1996-10-01
Chin, Tommy P.
Television
Image signal processing circuitry specific to television
Motion dependent key signal generation or scene change...
348594, H04N 732
Patent
active
055614779
ABSTRACT:
In a video signal processor including a motion compensated predictive coding data compression system, three adjacent image frames (1, 2, 3) are analyzed to detect a luminance gradient such as is typically associated with image fading. The frames are similarly divided into several segments (A . . . L). The sum of the absolute pixel value differences between corresponding segments from adjacent frames is obtained for each of two pairs adjacent frame segments (DIFF.sub.1-2 ; DIFF.sub.2-3). The ratio of the two frame differences (S) is obtained for each segment. Fading is indicated if the ratio remains substantially constant for all or a predetermined number of regions. If fading is detected, any motion vectors generated by the motion coder are assigned a zero value and are not coded.
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patent: 5162907 (1992-11-01), Keating et al.
patent: 5181111 (1993-01-01), Hedley et al.
patent: 5200820 (1993-04-01), Gharavi
patent: 5245436 (1993-09-01), Alattar
patent: 5363146 (1994-11-01), Saunders et al.
Video Compression Makes Big Gains, by Ang et al., IEEE Spectrum, Oct. 1991.
Au A.
Chin Tommy P.
Herrmann Eric P.
Kurdyla Ronald H.
Thomson Consumer Electronics Inc.
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