Progressive DCT-based coder and its comparison to atomic function based image lossy compression

In this paper, a progressive DCT-based coder (PDCTC), which implements a lossy image compression algorithm based on discrete cosine transform (DCT) and provides progressive data reconstruction, is introduced. It is compared to JPEG as well as to discrete atomic compression (DAC) that is an algorithm based on discrete atomic transform (DAT). It is shown that the algorithm proposed provides higher compression ratio (CR) than JPEG with the same quality loss measured by PSNR-metric. Also, it is proved that PDCTC and DAC have almost the same efficiency in terms of rate/distortion curve (dependence of PSNR and compression ratio). Besides, the complexity of these algorithms is analyzed.