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A theory of constructing locally supported radial wavelet frame and its application

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Abstract

A new method for constructing locally supported radial wavelet frame or basis, which is different from the multiresolution analysis, is proposed. A continuously differentiable radial function with a local, support is chosen at first. Then a radial wavelet is obtained by the first and second derivatives of the radial function. If the radial function is both locally supported and infinitely differentiable, so is the radial wavelet. It is shown that the radial wavelet is a multidimensional dyadic one. I. Daubechies’ wavelet frame Theorem is extended from one dimension ton dimensions. It is proven that the family generated by dilations and translations from a single radial wavelet can constitute a frame inL 2(ℝn). Consequently, it is concluded that the radial wavelet family generated by dilations and translations combined with their linear combination can constitute an orthonormal basis inL 2(ℝn). Finally, an example of the radial wavelet, which is inseparable and with a local support and infinitely high regularity, is given based on the framework given here. As an application, a class of wavelet network for image denoising is designed, and an underrelaxation iterative fastlearning algorithm with varied learning rate is given as well.

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Authors and Affiliations

  1. Department of Computer Science, Xiamen University, 361005, Xiamen, China

    Cuihua Li

  2. Institute of Artificial Intelligence and Robotics, Xi’an Jiaotong University, 710049, Xi’an, China

    Nanning Zheng

Authors
  1. Cuihua Li
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  2. Nanning Zheng
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Additional information

Project supported by the National Natural Science Foundation of China (Grant No. 69735010) and Doctorate Foundation of Xi’an Jiaotong University.

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Li, C., Zheng, N. A theory of constructing locally supported radial wavelet frame and its application. Sci. China Ser. E-Technol. Sci. 42, 584–594 (1999). https://doi.org/10.1007/BF02916994

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  • DOI: https://doi.org/10.1007/BF02916994

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