Color suppression circuit and electronic camera using it
AssigneeSanyo Electric Co., Ltd.
InventorShinji Ukita
Life of this patent
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Abstract
Based on an output from a CCD, a luminance signal Y1 is extracted from an MTX circuit, and R gain and B gain of white balance information are extracted from a white balance control circuit. A luminance color gain conversion circuit generates a control signal for controlling the color gains of a high-luminance part based on the luminance signal Y1, R gain and B gain and supplies the generated control to a color suppression circuit. The color gains are varied as a color temperature of the high luminance part increasingly deviates from a color temperature associated with ordinary white light. Accordingly, an excellent color suppression characteristic for the high-luminance part is obtained relative to change in color temperature.
Claims7
A color suppression circuit capable of suppressing a high-luminance part of a signal supplied from an imager where color filters are arranged for respective pixels, comprising:
- signal extraction means for processing the signal supplied from said imager to extract a luminance signal and white balance information;
- and
- suppression means for controlling color gains of the high-luminance part of the signal supplied from said imager based on the luminance signal and the white balance information extracted by said signal extraction means such that the color gains are varied as color temperature of the high-luminance part increasingly deviates from a color temperature associated with ordinary white light so as to obtain an improved color suppression characteristic for the high-luminance part.
A color suppression circuit capable of suppressing a high-luminance part of a signal supplied from an imager where color filters are arranged for respective pixels, comprising:
- a signal extraction circuit processing the signal supplied from said imager to extract a luminance signal and white balance information;
- and
- a suppression circuit provided in a stage subsequent to said signal extraction circuit for controlling color gains of the high-luminance part of the signal supplied from said imager based on the luminance signal and the white balance information extracted by said signal extraction circuit such that the color gains are varied as color temperature of the high-luminance part increasingly deviates from a color temperature associated with ordinary white light so as to obtain an improved color suppression characteristic for the high-luminance part.
Dependencies are inferred from the claim text.