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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
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| 출원번호 | US-0923841 (1992-07-31) |
| 발명자 / 주소 |
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| 출원인 / 주소 |
|
| 대리인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 633 인용 특허 : 0 |
A method and system for embedding signatures within visual images in both digital representation and print or film. A signature is inseparably embedded within the visible image, the signature persisting through image transforms that include resizing as well as conversion to print or film and back to
A method and system for embedding signatures within visual images in both digital representation and print or film. A signature is inseparably embedded within the visible image, the signature persisting 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 an original image. The pixel values of the signature points and surrounding pixels are adjusted by an amount detectable by a digital scanner. The adjusted signature points form a digital signature which is stored for future identification of subject images derived from the image. In one embodiment, a signature is embedded within an image by locating relative extrema in the continuous space of pixel values and selecting the signature points from among the extrema. Preferably, the signature is redundantly embedded in the image such that any of the redundant representations can be used to identify the signature. Identification of a subject image includes ensuring that the subject image is normalized with respect to the original image or the signed image. Preferably, the normalized subject image is compared with the stored digital signature.
[ We claim:] [1.] A method of image signature processing of an original image having pixels with pixel values, the pixel values including a plurality of pixel values intermediate to minimum and maximum pixel values, comprising:locating a plurality of candidate points from among the pixels of the ori
[ We claim:] [1.] A method of image signature processing of an original image having pixels with pixel values, the pixel values including a plurality of pixel values intermediate to minimum and maximum pixel values, comprising:locating a plurality of candidate points from among the pixels of the original image;selecting a first plurality of signature points from among the candidate points;forming a signature by adjusting the pixel values of the signature points within the original image, thereby resulting in a signed image that includes the signature and pixel values of the original image that have not been adjusted to form the signature, the signed image including a plurality of pixel values intermediate to the minimum and maximum pixel values; anddigitally storing the signature in a database for future identification.
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