基于改进小波阈值函数的指纹图像去噪

摘要

针对指纹图像的特点，在分析了传统的软、硬阈值函数去噪原理的基础上，提出了一种新的小波阈值函数。新阈值函数克服了软、硬阈值函数存在的不足。通过选择不同的参数，可适应不同的图像。仿真实验表明，新阈值函数较传统阈值函数具有更好的视觉效果和更高的峰值信噪比（PSNR）。%Focusing on the fingerprint’s features, a new wavelet threshold function based on the traditional soft and hard threshold function is presented. The new threshold function overcomes the weaknesses of soft and hard threshold func-tions. It can adapt to different images by selecting different parameters. Simulation results show that, compared with tradi-tional threshold function, the new threshold function has better visual effects and PSNR.