Video Difference key generator
First Claim
Patent Images
1. A video difference key generator comprising:
- means for storing a predetermined reference video image;
means for enabling the storing means to receive the reference video image, the reference video image being provided via an input selector; and
means for comparing the reference video image from the storing means with an input video image from an input bus to produce a desired key output.
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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.
131 Citations
5 Claims
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1. A video difference key generator comprising:
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means for storing a predetermined reference video image; means for enabling the storing means to receive the reference video image, the reference video image being provided via an input selector; and means for comparing the reference video image from the storing means with an input video image from an input bus to produce a desired key output. - View Dependent Claims (2, 3, 4, 5)
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Specification