ELECTRONIC WATERMARK DETECTOR, VIDEO REPRODUCING DEVICE, VIDEO DUPLICATING DEVICE AND ELECTRONIC WATERMARK DETECTION PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an electronic watermark detector capable of improving the detection accuracy of a watermark pattern embedded in video information by various electronic watermark systems.

SOLUTION: The electronic watermark detector 100 comprises: a means 120 for extracting a pattern from the video information; a means 160 for storing cumulative information for each kind and the respective numbers of times of accumulation; a means 130 for calculating the strength of the correlation of the cumulative information and the extracted watermark pattern; a cumulative means 150 for accumulating the extracted watermark pattern to the cumulative information for which the strength of the correlation is maximum and equal to or more than a threshold; and a configuration means 180 for configuring an electronic watermark value from the cumulative information with the larger number of times of the accumulation.

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