System for detecting a video signal image intensity gradient

Details System for detecting a video signal image intensity gradient System for detecting a video signal image intensity gradient

1994-10-26

1996-03-19

Chin, Tommy P.

Television

Image signal processing circuitry specific to television

Motion vector generation

348700, H04N 728

Patent

active

055006892

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.

REFERENCES:
patent: 4779131 (1988-10-01), Matsumoto et al.
patent: 5162907 (1992-11-01), Keating et al.
patent: 5200820 (1993-04-01), Gharavi
patent: 5245436 (1993-09-01), Alattar
Video Compression Makes Big Gains, by Ang et al., IEEE Spectrum, Oct. 1991.

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