A daptive Normal Image Coding Scheme Basedon DCT Spectrum Distribution and H-Order
Fan Shu-xin · 中国邮电高校学报：英文版 · 1999
In this paper according to the results of DCT spectrum disfribution analysis. we propose an adaptivenormal image coding scheme and image pre treatment, which use multi-scale adaptive sub-blocks in h-order anddecompose direct current component Dc into both components. Redundancy in one of both components can beremoved by multi-direction in h-order, the other component can be quantified finitely in loss. with less influence onthe quality of the reconstructed image. A new method combining quart-tree and template matching is used to extractnon-zero data from the coefficient matrix,the ideal result has been achieved from the coding scheme. The newscheme is called ANQS (adaptive normal quantification scheme ). Experiments prove that ANQS is much betterthan JPEG in the same image. With ANQS excellent quality of reconstruction is obtained at data rate as low as 0.0625 bpp and their PSNR as high as 30.31 dB, respectively but JPEG method is only obtained at data rate: 0.180 bppand PSNR: 32. 19 dB.