Color Interpolation with Variable Color Ratio and High Frequency Based on the External Divide

Color interpolation scheme is necessary to acquire color images of good quality with a digital still camera in which a single CCD image sensor is equipped. Since a color filter array is adopted, we need to interpolate missing color values in the red, green and blue channels at each pixel location. Inappropriate color interpolation causes color artifacts resulting in degraded color resolution. In this paper, a color interpolation scheme with variable color ratio is proposed by incorporating cross-channel correlation. With the proposed scheme, we have achieved improvements in the image quality especially along the edges and in the detail of the image by removing color artifacts. The superiority of the proposed scheme is demonstrated in the experimental results.