Method and system for sharpening the luma and the chroma signals

摘要

A video processing system may be operable to utilize multi-band sharpening to process luma signals for image signals. The luma signal may be decomposed into a plurality of frequency band components, wherein each component may be processed separately using different sharpening gains and/or offsets. The multi-band processed components may be combined to generate sharpened output luma signals. The multi-band sharpening may be performed utilizing peaking processing, and the input luma signal and/or LTI sharpened luma signals may be combined with the multi-band peaking sharpened signals to generate the sharpened output luma signals. Corresponding chroma signals may also be adjusted to generate sharpened output chroma signals. Luma and/or chroma sharpening operations may be further adjusted based on coring, clipping avoidance, luma statistics, color region detections, and/or curve control parameters. Sharpened output image signals may be generated based on the sharpened output luma signals and the sharpened output chroma signals.

主权项

1. A method, comprising:
decomposing an input luma signal for an image signal into a plurality of frequency band components using a plurality of vertical filtering functions and at least one horizontal filtering function, each one of the vertical filtering functions being applied in series with one of the at least one horizontal filtering function; separately adjusting each of said plurality of frequency band components to generate a sharpened output luma signal, wherein separately adjusting comprises applying peaking processing by extracting a high frequency component of said input luma signal, multiplying said extracted component by a first gain to provide a first result, and combining the first result with said input luma signal; grouping the separately adjusted frequency band components into a plurality of subsets using a cross bar circuit, based at least in part on one or more criteria, for further separate adjustment of each of the subsets to generate the sharpened output luma signal; adjusting a corresponding input chroma signal for said image signal to generate a sharpened output chroma signal; and generating a sharpened output image signal based at least in part on said sharpened output luma signal and said sharpened output chroma signal.