Residue sampling for image and video compression
Wooshik Kim, Hyun Mun Kim · 2005
The chrominance subsampling has been widely used for the image and video compression. However, this can cause color distortion and image quality degradation. We developed a new sampling method in which the residual image after intra or inter prediction is subsampled instead of the original image subsampling. Since the residual image contains fewer information than the original image does generally, the information loss is reduced when the residual image is downsampled. Also the upsampling procedure is much less sensitive to the filtering methods selected as demonstrated in the experimental results. So we can apply a simple filtering to reduce the complexity. The experimental results show the effectiveness of the proposed sampling method. This sampling method can be further improved by applying adaptively according to the statistics of each block, and can be applied to the RGB image directly without color conversion.