Patent ID: 6826302
Filing Date: 2004-11-30
Classification: G06T,H04N

Abstract:
An image signal processing device for producing luminance signals from image signals output from a solid-state image-sensing device having a plurality of types of color filters arranged one for each of pixels thereof, comprising:an image signal accumulator for accumulating, for each of the types of color filters provided for the pixels of the solid-state image-sensing device, signal levels of image signals output from those of the pixels which are sensing a low color saturation region in which color saturation is low; a transmitted light amount corrector for producing, based on correction constants set one for each of the types of color filters provided for the pixels of the solid-state image-sensing device, corrected image signals by correcting image signals output from the pixels of the solid-state image-sensing device in order to counterbalance, for each of the types of color filters, amounts of light transmitted through the color filters; a correction constant calculator for setting, based on the signal levels of the image signals accumulated for each of the types of color filters in the image signal accumulator, the correction constants one for each of the types of color filters and feeding the thus set correction constants to the transmitted light amount corrector; a first luminance signal generator for smoothing a corrected image signal currently being fed thereto from the transmitted light amount corrector as obtained from a currently targeted pixel and corrected image signals obtained from a plurality of pixels located in neighborhood of the currently targeted pixel in order to produce a luminance signal for the currently targeted pixel; and a second luminance signal generator for newly producing a luminance signal for the currently targeted pixel based on the corrected image signal fed thereto from the transmitted light amount corrector as obtained from the currently targeted pixel and the luminance signal fed thereto from the first luminance signal generator as produced for the currently targeted pixel.