关键词: 图像去噪, 小波去噪, 多尺度变换, 阈值

Abstract: Wavelet image denoising has become the most widely classical method in image denoising area，and the concomitant emergence of multi-scale denoising method makes it as a hot spot in the current method of image denoising.This paper gives a overall summary on the current status of image denoising and wavelet denoising，also gives a brief description of the multi-scale geometric analysis and its development.And further more，it takes the detailed analysis and summary of image denoising methods based on multi-scale transform.Based on the understanding of the wavelet transform denoising and multi-scale image denoising，it puts forward on some prospects in the multi-scale image denoising.

Key words: image denoising, wavelet denoising, multi-scale transform, thresholding