Because coefficients match Laplacian distribution after classification based on their acitivity prediction, a context based classification and adaptive quantizer(CBCAQ) is used to them.

• 由于小波分解后的系数经活动性预测分类后具有拉普拉斯分布的性质 ；因此可对其采用预测分类的自适应量化方法进行编码 .