摘要： 根据指纹图像在局部具有很强的方向性，提出了一种基于块方向预测的无损压缩编码方法。在此方法中，首先将指纹图像分成8×8的图像块，计算出每一块的块方向信息，并根据这个方向信息，对各个块自适应地选择一个预测器；然后通过预测误差的Context模型进一步去除相邻像素之间的相关性；最后采用Rice算法对误差图像进行编码。实验表明，这种方法简单实用，压缩效果好于JPEG无失真模式和JPEG-LS。

关键词: 指纹图像, 无损压缩, 块方向预测, Context, 熵编码

Abstract: In this paper, a lossless image compression based on block direction prediction is presented, according to the strong direction performance of the fingerprint image. In the proposed method, a fingerprint image is firstly partitioned into 8×8 blocks, and the block directions of each image block are calculated. Then a direction predictor is adaptively selected for each block. After that, the context model is applied to further remove the correlation between neighbor pixels. At last, the Rice coderis applied for the residual image coding. The experimental results show that the proposed method is a simple and practical algorithm, and it outperforms over JPEG lossless mode and JPEG-LS.

中图分类号: 

• TN919.81