PS-CCDにおける相関判別色分離方式

概要

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A correlative directional interpolation that realizes improvements of luminance signal resolution and pseudocolor reduction is proposed for progressive scan CCD (PS-CCD) with Bayer color filter array, which consists of checkered G filters and line-alternated R and B filters. First, a correlative direction on a target pixel is detected by calculating horizontal and vertical correlations between a target pixel and its adjacent pixels. Next, according to the correlative directions, two primary color signals that are not the target pixel's color signal are interpolated as follows. The one on the correlative directional line is interpolated using fact that the color-difference signal for the target pixel is almost the same as averaged color-difference signal on the target line in the correlative direction. The other one not on the correlative directional line is interpolated using fact that the color-difference signal gradually changes toward any direction, even a direction with no correlation. Performance of this methodology is verified by software simulation. Result of software simulation indicates that this method has better transient characteristics and less pseudo-color than conventional method. These superior efficiencies have been performing this method a mainstream of signal processing for color video camera with a Bayer-filtered PS-CCD.
2001-01-20