Methods for marking images
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
N/A
app pub date -
Mar 26, 2002
filing date -
Apr 25, 1996
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An image is marked by making slight changes to pixel values. These changes are essentially imperceptible on human scrutiny, but detectable by computer analysis. Such markings have applications in identifying ownership of images (including video), and also in device control (e.g., triggering a 'do not copy' response in suitably configured hardware and software systems).
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