Optimized discrete wavelet transforms in the cubed sphere with the lifting schemeimplications for global finitefrequency tomography
نویسندگان
چکیده
Sébastien Chevrot,1 Roland Martin2 and Dimitri Komatitsch3 1IRAP, CNRS UMR 5277, Université Toulouse 3 Paul Sabatier, Observatoire Midi-Pyrénées, 14 avenue Edouard Belin, F-31400 Toulouse, France. E-mail: [email protected] 2GET, CNRS UMR 5563, Université Toulouse 3 Paul Sabatier, Observatoire Midi-Pyrénées, 14 avenue Edouard Belin, F-31400 Toulouse, France 3LMA, CNRS UPR 7051, Université Aix-Marseille, Centrale Marseille, F-13402 Marseille Cedex 20, France
منابع مشابه
Fixing of Cycle Slips in Dual-Frequency GPS Phase Observables using Discrete Wavelet Transforms
The occurrence of cycle slips is a major limiting factor for achievement of sub-decimeter accuracy in positioning with GPS (Global Positioning System). In the past, several authors introduced a method based on different combinations of GPS data together with Kalman filter to solve the problem of the cycle slips. In this paper the same philosophy is used but with discrete wavelet transforms. For...
متن کاملOptimization of Energy Consumption in Image Transmission in Wireless Sensor Networks (WSNs) using a Hybrid Method
In wireless sensor networks (WSNs), sensor nodes have limited resources with regard to computation, storage, communication bandwidth, and the most important of all, energy supply. In addition, in many applications of sensor networks, we need to send images to a sink node. Therefore, we have to use methods for sending images in which the number and volume of packets are optim...
متن کاملAn Lifting-Based Discrete Wavelet Transform and Discrete Wavelet Packet Processor with Support for Higher Order Wavelet Filters
The major challenge in the wavelet transforms is that there exist different classes of wavelet filters for different kinds of applications. In this chapter, we propose a generalized lifting-based wavelet processor that can perform various forward and inverse Discrete Wavelet Transforms (DWTs) and Discrete Wavelet Packets (DWPs) that also supports higher order wavelet filters. Our architecture i...
متن کاملAN INTELLIGENT FAULT DIAGNOSIS APPROACH FOR GEARS AND BEARINGS BASED ON WAVELET TRANSFORM AS A PREPROCESSOR AND ARTIFICIAL NEURAL NETWORKS
In this paper, a fault diagnosis system based on discrete wavelet transform (DWT) and artificial neural networks (ANNs) is designed to diagnose different types of fault in gears and bearings. DWT is an advanced signal-processing technique for fault detection and identification. Five features of wavelet transform RMS, crest factor, kurtosis, standard deviation and skewness of discrete wavelet co...
متن کاملFlexible Wavelet Transforms Using Lifting
Roger L. Claypoole, Jr. and Richard G. Baraniuk, Rice University Summary We introduce and discuss biorthogonal wavelet transforms using the lifting construction. The lifting construction exploits a spatial{domain, prediction{error interpretation of the wavelet transform and provides a powerful framework for designing customized transforms. We discuss the application of lifting to adaptive and n...
متن کامل