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The non-uniform flow field around high-speed flying vehicle “bends” the ray and imposes an imaging deviation on the imaging plane. This deviation seriously affects the airborne imaging applications. In this study, the factors that influence the imaging deviation are cataloged into two classes: the vehicle-related factors and the flow-field-related factors. Flow density computations are discussed....
Aero-optic imaging deviation characterizes the image position displacement on an imaging plane induced by the nonuniform flow field surrounding a high-speed flying vehicle. It is a kind of aero-optic effect that all the airborne imaging systems will encounter. This paper studies the imaging deviation at high altitudes from 40 to 60 km, with a step length of 5 km. CFD computations are completed by...
The Train-Track-Bridge coupling vibration theory and Boundary Element Method were employed to establish a calculation method for the noise radiated by vibrating bridge. A simply supported concrete U-beam serviced in Chongqing Rail Transit Line 1 in China was selected as a case study. According to the analysis, the vibration of U-beam under moving train mainly located in the frequency range of not...
In this paper, based on the mixed Gaussian modeling and segmentation of moving objects and shadow, we propose an adaptive threshold shadow detection method based on image block statistics. The experiments of the video sequences with the different light and environmental conditions show that the method can remove the shadow of the moving target very well, and it also can choose the threshold adaptively.
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