Demosaicing of images obtained from single-chip imaging sensors in YUV color space

Single sensor color digital cameras use color filter arrays (CFAs) for capturing an image. Color interpolation is then applied to the captured data for reconstructing the full color image. In this paper we present techniques for interpolating the CFA data in the YUV color space to obtain the full color image. The resulting color images could be directly used in the DCT based JPEG compression scheme. We have also used the concept of sub-band DCT computation for interpolating the individual components of color images in the DCT domain. Based on a simple strategy for computing the Y, U, and V components, several modifications are also proposed for improving the quality of the reconstructed images. We have observed that median filtering of the chrominance components improves the visual quality of the interpolated color image. The results are also compared with some of the well known interpolation algorithms and are found to have competitive advantages considering the speed of computations, quality of the image reconstruction, storage requirements, and false color suppression.