DS-DCT: the double-shift DCT image coding for low-bit-rate image transmission

Defu Cai; Yan-Ping Chen

doi:10.1117/12.24276

1 September 1990 DS-DCT: the double-shift DCT image coding for low-bit-rate image transmission

Defu Cai, Yan-Ping Chen

Proceedings Volume 1360, Visual Communications and Image Processing '90: Fifth in a Series; (1990) https://doi.org/10.1117/12.24276
Event: Visual Communications and Image Processing '90, 1990, Lausanne, Switzerland

Abstract

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 .

Citation Download Citation

Defu Cai and Yan-Ping Chen "DS-DCT: the double-shift DCT image coding for low-bit-rate image transmission", Proc. SPIE 1360, Visual Communications and Image Processing '90: Fifth in a Series, (1 September 1990); https://doi.org/10.1117/12.24276

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