Importance

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Abstract

An edge achromatization circuit and method is disclosed wherein, in digital camera signal processing, a signal having a linear characteristic before γ correction is performed to suppress a color component of an edge portion while keeping a luminance. The edge achromatization circuit includes a luminance signal operation matrix circuit for converting R, G, B signals before γ correction is performed therefor into a luminance signal, an edge detection circuit for extracting an edge signal from the luminance signal, an absolute value operation circuit for converting the edge signal into an absolute value, a multiplier for controlling the gain of the absolute value, subtractors for obtaining color difference signals from the R, G, B signals and the luminance signal, multipliers for multiplying the color difference signals and an output coefficient, and subtractors for arithmetically operating results of the multiplication and the R, G, B signals to obtain R′, G′, B′ color signals. The edge achromatization circuit can perform achromatization of an edge of an image without providing a quick variation to the signal.

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First Claim