Innovision Labs

Paul J Weihs

David Medin

A method and system for separating chrominance and luminance information from a composite spectral signal is disclosed. The method and system comprises demodulating the composite signal prior to separation of the chrominance or luminance information to provide a first U subcomponent and a first V subcomponent and then processing and filtering the first U subcomponent and the first V subcomponent to provide a second U subcomponent and a second V subcomponent, respectively. The method and system also includes combining the second U subcomponent and the second V subcomponent to provide the remodulated chrominance information. In so doing chrominance information is provided in which artifacts are substantially attenuated. Accordingly, by 'bypassing' the encoded space to provide 'clean U and V' signals directly from the composite signal, the chrominance information or component has no inherent phase (hue) sensitivity to its simultaneously demodulated U and V subcomponents as it does when utilizing conventional comb filtering techniques. Therefore, artifacts in the subcomponents is attenuated. Hence, the artifacts within the remodulated chrominance and extracted luminance information are also substantially attenuated.

System and method for separating chrominance and luminance components of

A system and method for reducing flicker in a display system using a flicker reduction circuit. The display includes a series of scan lines, each of which includes a set of pixels. The display is controlled by a video signal, which includes a series of video lines containing control variables that control the intensity of the pixels in the corresponding scan line. In one embodiment of the flicker reduction circuit, the flicker reduction circuit receives two of the video lines as input, and delays one of the one video lines using a memory, such that its control variables are synchronized in time with the other undelayed video line. The difference between the intensity of the synchronized pairs of control variables is determined, and the difference is fed into a look-up table. Based on the difference, the look-up table provides a control value that is then applied to one of the original synchronized control variables to provide a modified control variable that reduces flicker on the display screen.

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Sunnyvale, CA, United States of America

Paul J Weihs