Two Stage Demosaicing Algorithm for Color Filter Arrays

This paper proposes an efficient two stage demosaicing method to interpolate color filter array images. The proposed method based on the edge sensing technique improves the interpolation performance by adopting the color difference model for a green channel as well as a red/blue channel. In particular, the green channel interpolation method with a new concept includes the gradient operator, which uses the total amount of slope changes in adjacent color information, and the missing green color estimation, which uses Approximated Directional Line Averages. Comparing with various comparative experiments between the conventional results and the proposed ones, the performances of the proposed method in this paper outperform to existing algorithms in terms of visual performance both in numerical and visual aspects. Our method of demosaicing improves the standard performance by8.927dB on the average in comparison of other methods in MSE(Mean square Error).