This paper chief focuses on the application of wavelet analysis in the ECG signal as well as CT image denoising.

Text image denoising based on higher-order cumulant;

Adaptive image denoising algorithm based on multiwavelets transform;

Subband-adaptive image denoising based on contourlet transform;

Wavelet-based image de-noising algorithm;

A improved Muti-thresholding image de-noising method based on wavelet transform;

Image de-noising method based on multi-wavelet transform and synthesis threshold;

Study on Algorithm of Image Denosing Based on Multiwavelet Transform;

Algorithm of multi-transform domain HMT image denosing

Image denoise based on inter-scale correlations of Contourlet transform;

Anisotropic diffusion equation is a nonlinear image processing methods by using Partial Differential Equation(PDE),with the nonlinear diffusion coefficient,it can restrain noise fairly good,reserve original edge and texture,especially for image denoise.

classic image denoise method includs low-pass filter,median filter and most effective wavelet denoise filter.

For its good real-time characteristics and easy realization,it has been adopted by new image de-noise.

<Abstrcat> This paper briefly introduces the theory of wavelet analysis, and explains the wavelet transform s typical application in image processing by example, that contains image compression, image de-noise, image engancement and image merging.