发明名称 |
WATERMARK EMBEDDING AND DETECTION OF A MOTION IMAGE SIGNAL |
摘要 |
Methods and arrangements are disclosed for embedding and detecting a watermark in a cinema movie, such that the watermark can be detected in a copy made by a handheld video camera. The watermark embedder divides each image frame into two areas. A watermark bit '+1' is embedded in a frame by increasing the luminance of the first part and decreasing the luminance of the second part. A watermark bit '-1' is embedded by decreasing the luminance of the first part and increasing the luminance of the second part. It is achieved with the invention that the embedded watermark survives ' de-flicker' operations that are often used to remove flicker caused by the different frame rates of cinema projection equipment and consumer camcorders. |
申请公布号 |
KR20050091094(A) |
申请公布日期 |
2005.09.14 |
申请号 |
KR20057013398 |
申请日期 |
2005.07.20 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V. |
发明人 |
VAN LEEST ADRIAAN J.;LINNARTZ JOHAN P.M.G. |
分类号 |
G06T1/00;H04N7/08;H04N7/26;(IPC1-7):H04N5/913 |
主分类号 |
G06T1/00 |
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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