Removing noise from the image frame remained a difficult task for researchers. Image denoising is an important issue in image processing and computer vision. A good image denoising model should completely eliminate noise and preserve edges. There are several existing methods for denoise image. Each method has its advantages and disadvantages. In this paper a review of some important works done in the field of image denoising is presented. This paper also contains a comparative study of different image denoising techniques.

Denoising; Wavelet transforms; Gaussian noise; Speckle noise; linear filters; Thresholding

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