IEEE Transactions on Consumer Electronics
Demosaicing: image reconstruction from color CCD samples
IEEE Transactions on Image Processing
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This paper presents a new color interpolation method for Color Filter Array that is commonly used in a single-sensor digital camera. We propose a spatial directional interpolation scheme that makes use of the local geometric information extracted from the surrounding pixels. Based on the image model that R, G, B channels are highly correlated, the weighting-based interpolation is performed in the color difference domain instead of in the original pixel domain. The weights, determined based on the approach of directional-based signal distance, are capable of adapting to the local image structure. Experimental results indicate the proposed method can reconstruct the missing pixel values better and preserve the sharp edge information at the same time without color-bleeding artifacts. Both subjective visual evaluation and objective performance measurement show the proposed method outperforms many existing methods.