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An Improved Method for Image Denoising Based on Wavelet Thresholding

  

  1. 1. College of Computer and Information Engineering, Nanyang Institute of Technology, Nanyang 473000, China;

     2. College of Software, Nanyang Institute of Technology, Nanyang 473000, China
  • Received:2014-12-29 Online:2015-04-27 Published:2015-04-29

Abstract:

Analyzing the characteristics of the wavelet threshold denoising, because that hard threshold denoising makes boundaries fuzzy and soft threshold denoising has
Gibbs phenomenon, an improved threshold function and threshold estimation method is proposed, the new threshold function is continuous differentiable and has variable deviation,
a new threshold estimation method has better adaptive. Experimental results show that the improved method can effectively remove the white noise, no matter from the visual
effect, or the signal-to-noise ratio, the improved method is better than the soft, hard threshold denoising.

Key words: image denoising, wavelet transform, threshold function, threshold estimation, threshold denoising