Image compression via sparse reconstruction
The traditional compression system only considers the statistical redundancy of images. Recent compression works exploit the visual redundancy of images to further improve the coding efficiency. However, the existing works only provide suboptimal visual redundancy removal schemes. In this paper, we propose an efficient image compression scheme based on the selection and reconstruction of the visual redundancy. The visual redundancy in an image is defined by some images blocks, named redundant blocks, which can be well reconstructed by the others in the image. At the encoder, we design an effective optimization strategy to elaborately select redundant blocks and intentionally remove them. At the decoder, we propose an image restoration method to reconstruct the removed redundant blocks with minimum reconstructed error. Encouraging experimental results show that our compression scheme achieves up to 13.67% bit rate reduction with a comparable visual quality compared to traditional High Efficiency Video Coding (HEVC).