A novel interpolation scheme for quincunx-subsampled images

Image interpolation tries to produce a higher-resolution image from an original image with a lower resolution. In this paper, we introduce a frequency-domain zero-masking technique to set a sufficient number of high-frequency transformed coefficients of an image block to zero, based on which an image interpolation scheme for the quincunx sub-sampling lattice is derived. This interpolation scheme finds solid support from the human visual system that is less sensitive to high frequencies than to low frequencies. Its superiority over other existing schemes has been examined under various circumstances where no coding is applied to the original image or the original image is coded at a (very) low bit-rate