This project presented a joint demosaicking–zooming scheme for single-chip digital color imaging devices. The proposed method well exploits the high spectral correlation existed in the images of natural scenes. The R–G and B–G color difference images are first estimated and they are used to recover the green channel. As an anchor to reconstruct the red/blue channel, the green image is enlarged by using an edge direction guided interpolation scheme. Instead of directly enlarging the red/blue channels, we interpolated the R–G and B–G images because they are much smoother than the original color images. Adding the interpolated color difference images to the already enlarged green channel produces the red and blue images. The proposed joint demosaicking–zooming scheme was compared with other methods and the experimental results showed that it performs well in both visual perception and PSNR measurement.
Zhang, Lei, and David Zhang. “A joint demosaicking–zooming scheme for single chip digital color cameras.” Computer Vision and Image Understanding 107.1-2 (2007): 14-25.