DS-DCT: the double-shift DCT image coding for low-bit-rate image transmission
Defu Cai, Yanping Chen · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1990
Traditional block transform coding scheme would generate the artifact called blocking effects near block boundaries which degrate the low bit rate coded images. In this paper; the Double Shift DCT ( DS-DCT ) image coding scheme is to be presented. The pixels in spatial and coefficients domain has been shifted according to the equal-pitch principle before DCT transformation. Finally; the blocking effects will be reduced to a very low level. At the mean time; the energy with in subblocks will be more compacted. Therefore; the benefits of more data compression will be accompanied with the reducing blocking effects. The DS-DCT results in smaller image reconstruction errors; better signal to noise ratio and more data compression than the adaptive DCT image coding scheme from Chen1 .