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The transport of intensity equation (TIE) has established the relationship between the phase of an optical field and the variation of its intensity along the direction of propagation. In this paper, a new method based on TIE used for two-wavelength phase retrieval has been proposed. The TIE is solved by employing the regularized Fourier-transform-based-approach under two separate wavelengths, gaining...
Referring to low designed freedom and high cost of conventional optical element, a method of realizing programmable diffractive optical elements which are based on liquid crystal spatial light modulator is studied. Firstly, liquid crystal spatial light modulator with pixels structured characteristics analyzed; secondly, the phase modulation functions of diffractive optical elements are encoded by...
This paper presents a 6-way power combining amplifier based on a 3-way traveling-wave waveguide combiner and waveguide-microstrip double probes. According to the reactive measure results, the input and output return loss (RL) of the 6-way dividing/combining networks are more than 17dB from ×3.5 GHz to ×5.5 GHz.The insert loss (IL) of the back-to-back is about 1.5dB, the combining loss is about 0.65dB...
SDS becomes more and more popular, and several companies have announced their product. But the generic standard still has not appeared, most products are only appropriate for their devices and SDS just can integrate a few storages. In this thesis, we will use the Open Stack to build and manage the cloud service, and use software to integrate storage resources include Hadoop HDFS, Ceph and Swift on...
At present, there are mainly two types of methods in cross-terms suppression of time-frequency distribution: one is improving of Cohen class kernel functions, the other is combination with linear time-frequency analysis. Their advantages and disadvantages are analyzed with examples respectively in this paper, and then time-frequency image features are analyzed. By introducing edge detection and ridge...
In this paper, we investigate an important but understudied problem, gender classification from human gaits. And we have proved the ability of using GEI (Gait Energy Image) as a representation of human gait for arbitrary view angles. Using GEI as a discriminative feature, we construct angle classifiers and gender classifiers from different approaches. Experiments show that our system achieved a good...
In modern Web Applications, how to design a flexible and changeable report is always one of the key problems to web software designers and developers. Here by analysis the web report tasks and its characteristics, based on the research of the software bus technologies, component technologies and template technologies, with software bus and template technologies illustrates a task driven based generic...
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