发明名称 |
System for coding a video signal in the presence of an image intensity gradient |
摘要 |
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 (DIFF1-2; DIFF2-3). 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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申请公布号 |
US5561477(A) |
申请公布日期 |
1996.10.01 |
申请号 |
US19940329553 |
申请日期 |
1994.10.26 |
申请人 |
THOMSON CONSUMER ELECTRONICS, INC. |
发明人 |
POLIT, PETER P. |
分类号 |
H04N11/04;G06T9/00;H03M7/36;H04N5/14;H04N7/26;H04N7/32;H04N7/36;H04N7/50;(IPC1-7):H04N7/32 |
主分类号 |
H04N11/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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