Qdesign Usa, Inc.

Jason A Lesperance

Sergiy Bilobrov

Richard J Beaton

Ronald H Gerhards

Hongfei Ma

David Jacques Vaisey

Albert Chau

Copying of visual images by electronic devices is discouraged by metamerically altering the relative weights of the color components forming the visual images in a manner that is not perceptible to the human eye but which is perceptible in the copy. In a preferred technique, the visual images are represented by more than three primary color components whose relative values are varied in this manner. A primary application is to discourage copying by video cameras of movies displayed on theater movie screens, by causing the copies to contain unacceptable spatial or temporal variations in colors perceived by the human eye.

Techniques of imperceptibly altering the spectrum of a displayed image in a manner that discourages copying

In order to discourage compression of video and other visual image signal data that accompanies unauthorized reproduction, distribution and storage of such data, the signal data is modified in a manner to be essentially imperceptible but which, when compressed and then decompressed, causes the signal quality to be unacceptable. In one approach, the visual signal is modified directly. In another approach, the signal is first transformed into the same domain where a compression-decompression algorithm encodes and decodes the data, and then the transformed signal is modified so that the quality of the visual signal when decompressed and displayed is unacceptably degraded.

Anti-compression techniques for visual images

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Vancouver, Canada

Jason A Lesperance