Video difference key generator

Details Video difference key generator Video difference key generator

H - Electricity

04

N

350/53

H04N 5/275 (2006.01) H04N 9/75 (2006.01)

Patent

CA 1314097

- 9 - Abstract of the Disclosure A video difference key generator has stored reference video image. An input video image is compared with the reference video image by an absolute difference circuit which subtracts 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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