초록 ▼

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 possible image, the signature persisting through image transforms that include resizing as well as conversion to print or film and back t

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 possible 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.

대표청구항 ▼

[ We claim:] [1.] A method of processing an image encoded as points, each point having a parameter value, the method comprising:identifying plural points within the image;increasing the parameter value of each of a first group of said identified points, and also increasing the parameter values of a

[ We claim:] [1.] A method of processing an image encoded as points, each point having a parameter value, the method comprising:identifying plural points within the image;increasing the parameter value of each of a first group of said identified points, and also increasing the parameter values of a first patch of points surrounding each such point; anddecreasing the parameter value of each of a second group of said identified points and also decreasing the parameter values of a second patch of points surrounding each such point.