3 ) furtherly , an entropy encoder can compress the quantified values losslessly , and give a better overall compression result , too . in this paper , a new adaptive arithmetic coding scheme is given 3 )在熵編碼階段,比較了huffman編碼和算術(shù)編碼的優(yōu)缺點(diǎn),最后選取了一種自適應(yīng)的算術(shù)編碼方案。
First , the coefficients of wavelet are quantized by the threshold formed by the eye ' s sensitivity to it ' s subband . then , wavelet coefficients are encoded by the entropy encoder , with the contexts formed by quantizing their prediction values , which are determined by their neighbors in space and time dimensions 它首先利用人眼視覺模型( hvs )對子帶的系數(shù)進(jìn)行量化;然后利用空間和時(shí)間相鄰的系數(shù)對當(dāng)前系數(shù)進(jìn)行預(yù)測,以預(yù)測值的量化值作為上下文,對系數(shù)進(jìn)行基于上下文的算術(shù)編碼。