Wavelet-based color filter array demosaicking

In this paper, a wavelet-based technique for the demosaicking of color filter arrays (CFA) is proposed. Conventional demosaicking techniques perform interpolation of the missing pixels in the YC_rC_b color space, where emphasis is put on an optimal interpolation of the luminance. We make advantage of this by merging the obtained luminance image with interpolated R1G and B images. The merging is performed in a multiresolution way, using the wavelet transform. This postprocessing technique is demonstrated to outperform traditional demosaicking interpolation techniques, visually as well as quantitatively, using two measures, the PSNR and ΔE_ab, which is a measure for the average color distance between original and demosaicked images in the CIELAB color space.