Digital video effects system employing a chroma-key tracking technique
First Claim
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1. A tracking system for producing special effects on a television picture, picture comprised of a first picture and a second picture inserted into said first picture, said first and second pictures being represented by first and second video signals respectively, said system comprising:
- means for producing a key signal representing a key frame to be positioned on said first picture;
means responsive to said key signal for producing a position signal representing a position of a circumscribed frame of said key frame;
means responsive to said position signal for producing an imaginary-frame position signal representing an imaginary frame greater than said key frame;
means responsive to said second video signal and said imaginary-frame position signal for producing a compressed second video signal representing a compressed second picture, said compressed second picture being identical in size to said imaginary frame; and
means responsive to said key signal for selectively combining said first video signal and said compressed second video signal, whereby to said special effects are produced.
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Abstract
A chroma-key tracking system for electronically compressing a television picture to predetermined dimensions and for moving the compressed picture to a specified area on the television screen where the compressed picture is inserted into a second picture present on the screen. The chroma-key tracking system advantageously operates in the presence of electrical noise associated with the chroma-key tracking signal.
34 Citations
5 Claims
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1. A tracking system for producing special effects on a television picture, picture comprised of a first picture and a second picture inserted into said first picture, said first and second pictures being represented by first and second video signals respectively, said system comprising:
- means for producing a key signal representing a key frame to be positioned on said first picture;
means responsive to said key signal for producing a position signal representing a position of a circumscribed frame of said key frame;
means responsive to said position signal for producing an imaginary-frame position signal representing an imaginary frame greater than said key frame;
means responsive to said second video signal and said imaginary-frame position signal for producing a compressed second video signal representing a compressed second picture, said compressed second picture being identical in size to said imaginary frame; and
means responsive to said key signal for selectively combining said first video signal and said compressed second video signal, whereby to said special effects are produced. - View Dependent Claims (2, 3, 4, 5)
- means for producing a key signal representing a key frame to be positioned on said first picture;
Specification