| 摘要 |
The invention relates to the application of identifying codes to stationary images, for example images of fine art, using a process known as watermarking, by means of which coded identification data are incorporated into proprietary visual images. A system is described whereby the identification codes remain detectable in, and retrievable from, watermarked images, even where the images have been changed or modified as a result of operations such as resizing, cropping and rotation. The system combines a reference code with an identification code and embeds the combined codes into a still image, and a scanning process, which may automatically switch between coarse and fine modes, is used to detect the reference code and to decode as an identification code, data located in conjunction with a detected reference code, utilizing respective modules for (a) modification detection, (b) image resumption and (c) decoding.
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