## Abstract The Rician distribution of noise in magnitude magnetic resonance (MR) images is particularly problematic in low signalβtoβnoise ratio (SNR) regions. The Rician noise distribution causes a nonzero minimum signal in the image, which is often referred to as the rectified noise floor. True
Construction of Real-Valued Wavelets by Symmetry
β Scribed by D.X. Zhou
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 259 KB
- Volume
- 81
- Category
- Article
- ISSN
- 0021-9045
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β¦ Synopsis
A construction of orthogonal wavelet bases in (L_{2}\left(R^{d}\right)) from a multiresolution analysis is given when the scaling function is skew-symmetric about an integer point. These wavelets are real-valued when the scaling function is real-valued. As an application, orthogonal wavelets generated by polyharmonic (B)-splines are obtained. We also present an example to show that the center of a skew-symmetric scaling function may not be in (Z^{d} / 2). 1995 Academic Press. Inc.
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Vibration signals from machining processes contain very useful information and o!er excellent possibilities for in-process condition monitoring. Signi"cant and natural frequencies in vibration signals re#ect the inherent property of the system. Any change in the condition will result in the change i
## Abstract In this paper we are concerned with the threeβdimensional homogeneous isotropic elastostatic boundaryβvalue problem. Global basis vector fields are shown to be constructive structures for approximating the solution. The theoretical tool is a regularity condition developed from the class