作者: Gordon W. Braudaway , Karen A. Magerlein , Frederick C. Mintzer
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摘要: A system for placing a visible "watermark" on digital image is disclosed, wherein an of the watermark combined with image. The pixels are examined, and each pixel whose value not specified "transparent" value, corresponding original modified by changing its brightness but chromaticities. This results in mark which allows contents to be viewed clearly, discourages unauthorized use