Watermark embedding and detection of a motion image signal

Details Watermark embedding and detection of a motion image signal Watermark embedding and detection of a motion image signal

2004-01-13

2010-11-30

Tucker, Wesley (Department: 2624)

Image analysis

Applications

C382S250000, C382S232000, C713S176000, C380S221000, C380S238000, C380S210000, C380S218000, C348S461000, C348S463000, C348S467000

Reexamination Certificate

active

07844072

ABSTRACT:
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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Jan. 22, 2010 Office Action for Japanese Patent Application No. 2006-500353.

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