摘要：

结合半调图像纹理特性和小波包更精细的分解方法，通过对小波包系数的扫描方式和阈值函数的选取进行改进，提出对半调图像进行基于最优基的小波包变换压缩编码。根据小波包分解后高低频分量各自的特性，采用不同的编码方法，提高压缩效率。仿真实验结果表明，该算法在获得较好的压缩效果同时，提高了解码图像质量。

关键词: 半调图像, 小波包, 扫描方式, 阈值函数

Abstract:

According to texture of the halftone image. a new wavelet packet halftone image compression is proposed, in which the scan mode of the wavelet packet coefficients and the selection of threshold function are improved. The encoding method of high frequency and low frequency is different. Experimental results show that the new method can get better effect.

Key words: halftone image, wavelet packet, scan mode, threshold function

中图分类号: 

• TN919.81