【摘要】 提出了一种基于小波变换的图像压缩编码方法 ,充分利用图像分解后所得小波系数与原始图像的关系、各个子图像象素之间的相关性、各子图像方向上的相关性以及与人眼视觉特性 (HVS)的关系 ,做到充分利用图像的统计冗余与视觉冗余。为了得到高的压缩比和好的图像质量 ,精确保留对图像质量影响大的系数 ,而对图像质量影响小的系数进行粗略量化。同时 ,在对小波系数的组织和编码上 ,也做到了具有普遍适用性。结果表明 ,此方法计算简单、计算量小 ,编解码时间少 ,在压缩比较高的情况下获得了较好的图像质量。更多还原

【Abstract】 The paper proposes an image compression and coding scheme based on discrete wavelet transform (DWT), which makes the best of the relativities among original image and coefficients of wavelet, the relativities among pixels of subimages, the relativities among directions of subimages. Human visual specialities were considered, so the compression scheme leads up to make full use of the statistical redundancy and visual redundancy of image. To get high compression ratio and good quality of image, the coefficients of image working on the quality of image greatly were reserved accurately, but the coefficients of image working on the quality of image slightly were quantified roughly. Also, the regrouping and coding of the coefficients could be used universally. The experimental results show that the compression method is provided with simply calculating, little time for coding and decoding and satisfying quality companied with high compression ratio.更多还原