摘要
针对传统的阈值函数在图像去噪中存在硬阈值函数不连续、软阈值函数会产生恒定误差的不足,在多层小波变换的基础上,对阈值选取方法进行了改进,并改变了传统软阈值函数。实验结果表明,该方法无论在视觉效果还是在信噪比定量指标上均优于传统硬阈值法和软阈值法。
The traditional threshold functions have some deficiencies in image de-noising. Hard threshold function is discontinuous and soft threshold function will cause constant deviation. In view of this situation, it improves the threshold selection method and the traditional threshold function based on the multi-analysis wavelet transform. The simulation results show that this method is better than the traditional hard and soft threshold de-nosing methods in the PSNR and subjective visual effects.
出处
《重庆理工大学学报（自然科学）》
CAS
2013年第2期93-95,125,共4页
Journal of Chongqing University of Technology：Natural Science
基金
2011年运城学院院级项目(YQ-2011076)
关键词
阈值函数
小波变换
图像去噪
峰值信噪比
threshold function
wavelet transform
image de-nosing
peak signal-to-noise ratio
