小波域图像降噪是图像处理中一个引人注目的研究方向，为了使人们对小波域图像降噪有一概括了解，在对小波域图像降噪相关文献进行分析和理解的前提下，首先给出了小波变换的特性，同时阐述了小波去噪的最优准则和对图像进行小波变换时小波基的选取原则，然后评述了用于图像降噪的方法，并分析了利用小波系数建模的常用方法，最后探讨了小波域图像降噪的发展方向。

Wavelet domain image denoising has been a striking research problem in image processing. In order to give people a summary knowledge of wavelet domain image denoising, based on many literatures of wavelet domain image denoising, this paper attempts to make a survey of wavelet domain image denoising. First, it gives the characteristics of wavelet transformation, and gives the optimization criterion of wavelet domain image denoising, the selection of wavelet basis. Then, describes the methods of image denoising, and analyzes the building model methods capitalized on wavelet coefficients. At the end, the future trend of wavelet domain image denoising is pointed out.