| 摘要 |
PURPOSE: A fingerprint method and apparatus are provided to overcome the compression system incompatibility of fingerprint systems, not to degrade the inter-field redundancy to a level that requires excessive bit rates to provide a given picture quality. CONSTITUTION: A fingerprint technique is based on the principle of applying very slight local spatial distortion to the pixels in a video image by means of selected warp patterns. A spatial image distortion (SID) fingerprint inserter has properties; displacement of each pixel of the original image by a slight amount unnoticeable to the eye (which may be zero) horizontally and/or vertically. maintaining a given pixel in the fingerprinted image with the same set of contiguous pixels that it had in the original image. A spatial image distortion (SID) fingerprint inserter embodies a slight local spatial image distortion of a video signal which is not visually noticeable and which is electronically detectable. A warp engine prevents the fingerprinted video image from being copied, messages which allow identifying the source and date of an unauthorized copy of the video image, etc.
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