Techniques of imperceptibly altering the spectrum of a displayed image in a manner that discourages copying
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United States of America Patent
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Jun 10, 2008
Grant Date -
Apr 29, 2004
app pub date -
Oct 28, 2002
filing date -
Oct 28, 2002
priority date (Note) -
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Abstract
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.
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