Chroma-key color range determination
First Claim
Patent Images
1. A method for performing chroma-key processing on images, comprising the steps of:
- (a) receiving a first set of image signals comprising one or more components;
(b) generating a histogram for each of one or more of the components;
(c) generating a chroma-key color range from each histogram of the one or more histograms; and
(d) performing chroma-key processing on a second set of image signals using the chroma-key color range.
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Abstract
Histograms are generated for one or more of the image components. Each histogram is clipped at each end to exclude outlying values and to identify initial minimum and maximum values. Conservatism terms are included in each of the initial minimum and maximum values to generated final minimum and maximum values that are used as thresholds to define the color range used in chroma-key processing. In one embodiment, the first frame of a video sequence is designated as a chroma-key frame that is analyzed to determine the chroma-key color range.
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Citations
10 Claims
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1. A method for performing chroma-key processing on images, comprising the steps of:
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(a) receiving a first set of image signals comprising one or more components; (b) generating a histogram for each of one or more of the components; (c) generating a chroma-key color range from each histogram of the one or more histograms; and (d) performing chroma-key processing on a second set of image signals using the chroma-key color range. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for performing chroma-key processing on images, comprising:
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(a) means for receiving a first set of image signals comprising one or more components; (b) means for generating a histogram for each of one or more of the components; (c) means for generating a chroma-key color range from each histogram of the one or more histograms; and (d) means for performing chroma-key processing on a second set of image signals using the chroma-key color range.
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9. A storage medium encoded with machine-readable program code for performing chroma-key processing on images, comprising:
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(a) means for causing a machine to receive a first set of image signals comprising one or more components; (b) means for causing the machine to generate a histogram for each of one or more of the components; (c) means for causing the machine to generate a chroma-key color range from each histogram of the one or more histograms; and (d) means for causing the machine to perform chroma-key processing on a second set of image signals using the chroma-key color range.
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10. A transparency generator for performing chroma-key processing on images, wherein:
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the transparency generator receives a first set of image signals comprising one or more components; the transparency generator generates a histogram for each of one or more of the components; the transparency generator generates a chroma-key color range from each histogram of the one or more histograms; and the transparency generator performs chroma-key processing on a second set of image signals using the chroma-key color range.
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Specification