Motion detector for a video display system

A luma-chroma separation system, comprising:

• a demodulator system that demodulates the composite video signal to produce a baseband chroma signal and at least one delayed baseband chroma signal, a given baseband chroma signal containing chroma information for an associated one of a plurality of video frames comprising the composite signal;
• a motion detector that compares the at least one baseband chroma signal and the at least one delayed baseband chroma signals and generates a motion parameter reflecting the amount of motion between two frames from the plurality of frames comprising the composite signal;
• a two-dimensional (2-D) chroma path that produces a 2-D chroma signal;
• a three-dimensional (3-D) chroma path that produces a 3-D chroma signal;
• and
• a chroma mixer that combines the 2-D chroma signal and the 3-D chroma signal according to the generated motion parameter.

A method for detecting motion within a composite video signal, comprising:

• delaying an original composite video signal by at least one frame, representing a first frame, to produce a first delayed composite signal, representing a second frame;
• demodulating the original composite video signal to produce first and second baseband components;
• demodulating the delayed composite signal to produce third and fourth baseband chroma components;
• comparing the first and third baseband chroma components for a given pixel to quantify the motion in a chroma portion of the composite video signal as a first motion parameter representing the pixel;
• comparing the second and fourth baseband chroma signals for a given pixel to quantify the motion in the chroma portion of the composite video signal as a second motion parameter representing the pixel;
• and
• determining the motion within the composite video signal from the first and second motion parameter.