关键词: 图像去噪, 中值滤波, 均值滤波, 小波变换

Abstract: Noise reduction is one of the most important parts of image processing.Median filtering is a proven way to remove image noise.To select the appropriate size of the window can maximize to remove image noise on the basis of maintaining the accuracy of the image.On the basis of investigating the application of the median filtering algorithm denoising characteristics，implementing the improved median filtering algorithm denoising is studied.At the same time experiments are done to analyze the differences between the median filtering algorithm and the mean filtering，wavelet transform algorithm.Then the results are compared and the conclusion is given.

Key words: image denoising, median filtering, mean filtering, wavelet transform