Digital chromakey apparatus
First Claim
1. A digital chromakey system for combining a first digital color-television composite signal representing a first picture frame and a second digital color-television composite signal representing a second picture frame to be inserted into a desired portion of said first picture frame, said system comprising:
- (a) a digital filter for separating out a color signal component from said first digital color television composite signal;
(b) means coupled to said digital filter for generating a chromakey signal from said color signal component and a reference color signal;
(c) means coupled to said digital filter and said chromakey signal generating means for generating a first weighted signal from said first digital color-television composite signal, said color component, and said chromakey signal, such that said first weighted signal is weighted according to said chromakey signal and is substantially equivalent to said first digital color-television composite signal without said color component;
(d) means coupled to said chromakey signal generating means for generating a second weighted signal from said second digital color-television composite signal and said chromakey signal such that said second weighted signal is also weighted according to said chromakey signal and is substantially equivalent to said second digital color-television composite signal; and
(e) means coupled to said first and second weighted signal generating means for adding said first and second weighted signals to generate a combined digital color-television composite signal representing an image having said second picture frame is inserted into said first picture frame.
1 Assignment
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Accused Products
Abstract
The digital chromakey system filters out a color signal from a first digital color-television signal and produces a chromakey signal which is combined with the first digital color-television signal to cancel out the color portion. The chromakey signal is also combined with a second color-television signal so that the second color television signal can be inserted into the first color-television signal whose color portion was cancelled.
38 Citations
7 Claims
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1. A digital chromakey system for combining a first digital color-television composite signal representing a first picture frame and a second digital color-television composite signal representing a second picture frame to be inserted into a desired portion of said first picture frame, said system comprising:
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(a) a digital filter for separating out a color signal component from said first digital color television composite signal; (b) means coupled to said digital filter for generating a chromakey signal from said color signal component and a reference color signal; (c) means coupled to said digital filter and said chromakey signal generating means for generating a first weighted signal from said first digital color-television composite signal, said color component, and said chromakey signal, such that said first weighted signal is weighted according to said chromakey signal and is substantially equivalent to said first digital color-television composite signal without said color component; (d) means coupled to said chromakey signal generating means for generating a second weighted signal from said second digital color-television composite signal and said chromakey signal such that said second weighted signal is also weighted according to said chromakey signal and is substantially equivalent to said second digital color-television composite signal; and (e) means coupled to said first and second weighted signal generating means for adding said first and second weighted signals to generate a combined digital color-television composite signal representing an image having said second picture frame is inserted into said first picture frame. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of combining a first digital color-television composite signal representing a first picture frame with a second digital color-television composite signal representing a second picture frame to be inserted into a desired portion of said first picture frame, said method comprising the steps of:
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(a) separating out a color signal component from said first digital composite signal; (b) generating a chromakey signal from said color signal component and from a reference signal; (c) generating a first weighted signal weighted according to said chromakey signal and substantially equivalent to said first digital composite signal without said color component; (d) generating a second weighted signal weighted according to said chromakey signal and substantially equivalent to said second digital composite signal; and (e) combining said first and second weighted signals to form a combined composite signal.
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Specification