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Thus, a general construction method for a class of threshold functions is introduced, and sufficient conditions are given to ensure that the threshold functions are continuous, first-order differentiable and higher-order differentiable. It makes an existing class of improved threshold functions a particular case and enables the construction of other needed threshold functions based on this general approach. Experiments have shown that using the new threshold functions yields better denoising results for images containing salt and pepper noise, Gaussian noise and speckle noise. Moreover, as the smoothness of the threshold function is enhanced, the denoising effect is also improved. The improved wavelet coefficients estimation model can effectively boost the quality of image denoising, further enhancing the accuracy and effectiveness of computer vision algorithms.<\/jats:p>","DOI":"10.1142\/s0219691324500061","type":"journal-article","created":{"date-parts":[[2024,1,27]],"date-time":"2024-01-27T04:04:55Z","timestamp":1706328295000},"source":"Crossref","is-referenced-by-count":1,"title":["An improved model for wavelet coefficients estimation and its application to image denoising"],"prefix":"10.1142","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-1417-8579","authenticated-orcid":false,"given":"Xueqing","family":"Li","sequence":"first","affiliation":[{"name":"School of Science, Harbin University of Science and Technology, Harbin 150080, P. R. 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