| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and system for encoding a signature into a digital image and auditing a digital subject image to determine, whether it has been derived from the encoded image. SOLUTION: A method and system for embedding signatures inside visual images in both digital representation and print or film. A signature is inseparably embedded within the visible image, and persists through image transforms, that include resizing as well as conversion to print or film and back to digital form. Signature points are selected from among the pixels of original image. The pixel values of the signature points and surrounding pixels are adjusted by an amount that is detectable with a digital scanner. The adjusted signature points form a digital signature, which is stored for future identification of subject images derived from the image. The signature is embedded inside an image, by locating the relative extrema in the continuous space of pixel values and selecting the signature points from among the extrema. COPYRIGHT: (C)2007,JPO&INPIT |
