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.
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申请公布号 |
US2006129566(A1) |
申请公布日期 |
2006.06.15 |
申请号 |
US20050542837 |
申请日期 |
2005.07.20 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V. |
发明人 |
VAN LEEST ADRIAN J. |
分类号 |
G06F7/00;G06T1/00;H04N7/08;H04N7/26 |
主分类号 |
G06F7/00 |
代理机构 |
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代理人 |
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地址 |
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