【摘要】 从图像本身的统计特性出发,利用小波包对图像进行多层分解,提出适度分层阈值法,并将适度分层阈值法与分层阈值法对相同的图像进行对比实验。结果是,适度分层阈值法有效克服了DCT在图像压缩中存在的“方块效应”,并且比分层阈值法对图像进行压缩更能达到较好的压缩效果。更多还原

【Abstract】 In terms of statistic characteristics of an image,a wavelet package is used in the multi-layer decomposition of image compression,and that brings up a moderate-hierarchical threshold value method.It is compared with the hierarchical threshold method.The result shows that this method not only overcomes DCT shortcomings of square-piece effect in image compression,but also has more compression effect than the hierarchical threshold method.更多还原