Patent ID: 8330871

Claim:
A method for detecting motion in an image display device comprising: receiving a plurality of composite video signals having luminance signals and chrominance signals corresponding to a plurality of frames; determining luminance motion factors of the plurality of frames according to the luminance signals of the plurality of composite video signals; determining chrominance motion factors of the plurality of frames according to edge intensities of the plurality of frames and the chrominance signals of the plurality of composite video signals; and determining motion factors of the plurality of frames according to the luminance motion factors and the chrominance motion factors; wherein the step of determining chrominance motion factors of the plurality of frames according to edge intensities of the plurality of frames and the chrominance signals of the plurality of composite video signals further comprises: utilizing a first edge detection unit for determining edge intensity of frames corresponding to a first composite video signal of the plurality of composite video signals; utilizing a second edge detection unit for determining edge intensity of frames corresponding to a second composite video signal of the plurality of composite video signals; utilizing a chrominance difference decision unit for determining difference between chrominance signals of the same phase in the first composite video signal and the second composite video signal; and utilizing a chrominance motion factor decision unit coupled to the first edge detection unit, the second edge detection unit, and the chrominance difference decision unit, for adjusting decision results of the chrominance difference decision unit to determine the chrominance motion factors of the plurality of frames according to the edge intensities determined by the first edge detection unit and the second edge detection unit.