Image Enhancement by Thresholding on Wavelet Coefficient
The different wavelet transform-based methods of the image De-noising by thresholding on wavelet coefficients are discussed in this paper. These methods include different ways of adaptive calculating of threshold value and also kinds of thresholdig function. After examining the existing methods, a simple and efficient method based on local features of each pixel has been proposed. At last the proposed method has been compared the other existing methods and it is obtained that the proposed method, despite of the simplicity, has the same efficiency as some of the common complex methods. In addition some times it has better response than the complex methods.