A color interpolation scheme based on improved bilinear scheme for Bayer CFA digital cameras

Digital cameras mostly use a color filter array (CFA) to capture the colors of the scene. To render a full-color image, numerous color interpolation algorithms are proposed to recalculate full resolution R, G and B components. Based on the image correlation and simple edge detection, we propose a color interpolation scheme for Bayer CFA digital cameras. In our proposed scheme, an improved edge detection bilinear interpolation algorithm is used to calculate R and B components. Simulation results show that our proposed scheme can prevent from sudden change, flatten, less distortion effectively, and preserve vein and detail as much as possible. In edge areas of the test images, not only the advantage of simpleness in bilinear algorithm is retained, but also the number of pixels involved in the calculation is reduced. Moreover, our proposed scheme can also achieve a higher PSNR compare to three conventional methods.