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We present a three-dimensional ͑3-D͒ hyperspectral image compression algorithm based on zero-block coding and wavelet transforms. An efficient asymmetric 3-D wavelet transform ͑AT͒ based on the lifting technique and packet transform is used to reduce redundancies in both the spectral and spatial dimensions. The implementation via 3-D integer lifting scheme(More)
We report here a backscattering model of average signal power function (SPF) for laser radar 3D range imagery obtained by arrays of detectors for arbitrary coarse targets. The model relates the average power seen by the receiver with laser pulse, target shape, optical scattering properties of surface material, incidence angle and other factors. The optical(More)
Scattering characteristic of complex targets from sky and ground background radiance plays an important role in engineering fields. Firstly, a 5-parameter BRDF (Bidirectional Reflectance Distributional Function) model is introduced. Then MODTRAN is used to calculate the background radiance in infrared spectrum of 3-5 um and 8-12um bands. Considering the(More)
Multi-band Doppler spectrum of radar clutter at there-dimensional sea surface is calculated in this paper, the Elfouhaily sea spectrum with a direction function is applied to achieving the scattering fields is a classic PO method. Analysis on the spectrum width and shift of multi-band can be done. Larger spectrum width and shift have been seen in larger(More)
Based on the Planck's law and integrality the directional hemisphere reflectivity (DHR) and the Kirchhoffs law. And referred to the Torrance-Sparrow model and the five-parameter semi-empirical model, a new Bidirectional reflection distribution function model (BRDF) is developed in different temperature of material surface, this model will be applicable for(More)
The generalized forward-backward method was used to investigate the scattering characteristics from the sea surface with breaking waves, which gives a preliminary analysis of mechanism of sea spike phenomenon. The integral equation using impedance boundary condition was used for one-dimensional (1-D) PM surface. GFBM increasingly improved the computational(More)
Propagation of THz waves from 0.1THz to 0.8THz in sand-dust are studied using Mie theory and Monte Carlo(MC) simulation. Scattering characteristics of a spherical sand-dust particle illuminated by THz waves are analyzed by Mie theory. The extinction efficiency factor, the asymmetry parameter and scattering intensity versus frequency of incident waves are(More)
A brief introduction of the measuring system and methodology of the laser scattering from target is presented in this paper. The laser scattering characteristics of the reference standard plate (PTFE) and the flat plate with green camouflage paint are measured indoor. By analyzing the measured data, we obtained the directional hemispherical reflectance and(More)