Y.S. Han and M.G. Kang (Korea)
Demosaicking, color interpolation, digital video camera, complementary color filter array.
Complementary color filter array (CCFA) is widely used in consumer-level digital video cameras, since it has high sen sitivity and good signal-to-noise ratio in low-light condi tion. However, the full-color images obtained from CCFA suffer from some artifacts such as false color and zipper ef fects. These artifacts can be removed with edge-adaptive demosaicking (EAD) approaches which are generally used in primary color filter array (PCFA). Unfortunately, the unique array pattern of CCFA makes it difficult that CCFA adopts EAD approaches. Therefore, to apply EAD ap proaches suitable for CCFA to demosaicking is one of the major issues to reconstruct the full-color images. In this paper, we propose a new EAD algorithm for CCFA. To es timate an edge direction precisely and enhance the quality of the reconstructed image, a function of spatial variances is used as a weight and new color conversion matrices are presented for considering various edge directions. Experi mental results indicate that the proposed algorithm outper forms the conventional method with respect to both objec tive and subjective criteria.
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