beamlet การใช้

A new multiscale curve coder of binary multimedia based on beamlet
Line detection based on beamlet transform
Advanced mathematical technologies , especially the newly developed wavelet transform and the frame theory , provide a solid foundation for such an effort . the ray - theory based beam - summation method , such as the complex source - generated beam and the gaussian beam methods , and the local phase - space domain ( beamlet domain ) wave field extrapolation methods employing windowed fourier transform ( wft ) or wavelet transform are proposed consequently
In this thesis , we follow the idea of the beamlet - domain wave field extrapolation methods to construct localized propagators . through comparative study of signal decomposition efficiency using different representation schemes , we select two groups of basic functions with simple expressions and good localization properties for wave field decomposition , propagation and imaging
The other is the local cosine bases developed as a kind of orthogonal basis based on the fourier analysis and wavelet - packet theory . in this thesis , theoretical analysis and numerical applications are mainly focused on the beamlet - domain wave field extrapolation using g - d frame propagators . the whole thesis consists of six chapters