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浏览/检索结果: 共4条，第1-4条 帮助 限定条件 内容类型：会议论文     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 A new modeling method for gray feature 会议论文 Shanghai, China, April 9, 2014 - April 10, 2014 作者:  Li, Ming;  Chen, Chao 收藏  |  浏览/下载：2/0  |  提交时间：2020/11/15 Algorithms  Information technology  Models  Robustness (control systems)  Complex background  Complex environments  Gray features  Mean shift  Mean shift algorithm  Model method  Suitability  Tracking effects   A New Modeling Method for Gray Feature 会议论文 作者:  Li, Ming;  Chen, Chao 收藏  |  浏览/下载：7/0  |  提交时间：2019/11/15 target tracking  gray feature  modeling  Mean-Shift  suitability  robustness   The movement estimation of target and background by fourier phase spectrum difference (EI CONFERENCE) 会议论文 2010 6th International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2010, September 23, 2010 - September 25, 2010, Chengdu, China Wu Y.; Zhang S.; Wang J.; Jia J.; Yu Q.; Zhang X. 收藏  |  浏览/下载：11/0  |  提交时间：2013/03/25 An algorithm for estimating displacement of the moving target and background by shift theory of Fourier transform is presented. According to the relation between the change and the Fourier transform of image sequence  the method employs the displacement value of the moving target and background by the difference of Fourier phase spectrum. The algorithm estimates the movements from the whole field of the image with excellent global property. This paper provides the calculus and experiments of the algorithm which show the accuracy of 1 pixel. 2010 IEEE.   Thermal difference analysis and athermalization design of infrared optical system (EI CONFERENCE) 会议论文 Optical Design and Testing IV, October 18, 2010 - October 20, 2010, Beijing, China Ai X.-Q.; Liu B.; Zhang X.; Jia H. 收藏  |  浏览/下载：25/0  |  提交时间：2013/03/25 When infrared optical system works in a large temperature range  the thermal effect of optical lens and optical tube will produce image plane shift and lead to imaging quality deterioration. In order to eliminate the thermal aberration  the athermalization design principles of infrared optical system were introduced  and some commonly used methods of thermal difference compensation were described. Proceeding from single lens  the thermal difference caused by temperature changing was analyzed  and the relationship between temperature and focus shift was obtained. Considering optical tube thermal expansion  a set of equations to estimate the thermal difference of lens group was given. Finally  an infrared optical imaging system that can work under the temperature range of -40C to 60C was design according to athermal technique  in which a new mechanical passive temperature compensation was proposed. Through simulation  the athermalization design could make imaging plane shift the smallest. The simulation results coincided with the theoretical formula  and the design had reference value in engineering. 2010 Copyright SPIE - The International Society for Optical Engineering.