An Embedded Image Coding Method Based on DCT
Jia Wang · Jisuanji gongcheng · 2004
A mean-subtract embedded DCT coding method(MSEDCT) based on the similar wavelet zerotree structure is proposed. The method rearranges coefficients of block DCT in some ways and reduces high correlation between DC coefficients by a simple mean-subtract method. Then based on the wavelet zerotree quantizer and its arithmetic entropy encoder, an image is compressed effectively with high PSNR at high compression ratios. The bitstream by this method is rate-scalable, suitable for image progressive transmission or robust transmission over wireless channels or Internet.