发明名称 |
System and method for antipiracy using frame rate dithering |
摘要 |
<p>A method and system of displaying an image sequence containing a plurality of image frames to inhibit an unauthorized duplication thereof by a camera. The method includes steps of generating a pseudo-random noise sequence, and displaying the image sequence at a frame rate which is varied for successive pairs of the image frames in dependence upon the pseudo-random noise sequence. The frame rate is varied within a predetermined range about a nominal frame rate for the image sequence such that the variations are imperceptible by a human observer. The system includes a pseudo-random sequence generator (30) which generates the pseudo-random noise sequence, and a display device (36) to display the image sequence at a frame rate which is varied in dependence upon the pseudo-random noise sequence. <IMAGE></p> |
申请公布号 |
EP0851678(A1) |
申请公布日期 |
1998.07.01 |
申请号 |
EP19960120754 |
申请日期 |
1996.12.23 |
申请人 |
HE HOLDINGS, INC. DBA HUGHES ELECTRONICS |
发明人 |
MEAD, DONALD C. |
分类号 |
H04N5/913;H04N7/167;H04N21/258;(IPC1-7):H04N5/913 |
主分类号 |
H04N5/913 |
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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