Video Difference key generator
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United States of America Patent
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-
Jan 24, 1989
Grant Date -
N/A
app pub date -
Oct 24, 1986
filing date -
Oct 24, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A video difference key generator has a stored reference video image. An input video image is compared with the reference video image by an absolute difference circuit which substracts corresponding pixels of the two video images, the smaller from the larger, to produce a difference video image. The difference video image may be filtered, and then is input to a transfer function circuit to produce an output which may be used as a key signal for compositing video images.
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Cited Art Landscape
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