Patent ID: 6373974
Filing Date: 2002-04-16
Classification: G06T

Abstract:
A method for embedding and extracting visually imperceptible indicia in an image, comprising; embedding a visually imperceptible indicia in an original image;generating a pseudo random sequence, including using a one-way deterministic function, to a single parameter and using the single parameter as a seed to generate an independent identical distribution pseudo random sequence; testing a test image for an embedded visually imperceptible indicia; and extracting the visually imperceptible indicia from the test image to determine if the test image is a copy of the original image, wherein said embedding and said extracting include dividing an image into segments, and wherein said extracting includes making use of neighboring watermark bits to detect the current bit, for an image that has been subject to different levels of signal processing; and wherein said extracting further includes adaptively selecting a number of segments for watermark detection as a function of the level of signal processing.