Systems and methods for correcting color phase error in video systems
AssigneeTexas Instruments Incorporated
InventorsWeider Peter Chang, Ramesh M. Chandrasekaran
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Abstract
Systems and methods are provided for correcting color phase error in a video decoder system. A demodulator system demodulates the composite input signal and the at least one delayed signal to produce sets of baseband chroma components based on a phase correction value. Color phase correction logic determines the phase correction value for the demodulator system based upon characteristics of the baseband chroma components associated with a series of at least two consecutive frames.
Claims21
A video decoder system, comprising:
- a demodulator system that demodulates a composite video input signal to produce at least baseband chroma components based on a phase correction value;
- and
- color phase correction logic that determines the phase correction value based upon characteristics of the baseband chroma components associated with a series of at least two consecutive frames.
A method for correcting phase error in a video decoder system, comprising:
- demodulating an input signal to provide a first set of chroma components, representing a first frame, and a second set of chroma components, representing a second frame, for each of a plurality of pixels;
- generating a first vector from the first set of chroma components and a second vector from the second set of chroma components;
- selecting a subset of pixels according to at least one selection criteria;
- determining an angular difference between the first vector and the second vector for each of the selected subset of pixels;
- and
- summing the determined angular differences.
A video system, comprising:
- a demodulator system that demodulates a composite video signal to produce a first set of chroma components, representing a first frame, and a second set of chroma components, representing a second frame;
- color phase correction logic that calculates a phase correction value for the demodulator system based upon characteristics of the first and second sets of baseband chroma components;
- and
- a video display, visible to a user, that displays a signal represented by at least the first set of chroma components and an associated luma component.
Dependencies are inferred from the claim text.