排序方式： 共有13条查询结果，搜索用时 62 毫秒
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将一正弦条纹分别投影到参考物体和待测物体表面,得到参考物体的变形条纹图像和待识别物体的变形条纹图像。以此变形条纹作为联合变化相关的输入图像,通过联合变换相关,得到自相关和互相关输出,最后根据输出的相关峰大小即可判别不同的物体。用Matlab软件编程实现三维物体联合变换相关识别,并且验证了联合变换相关识别物体具有平移不变性。 相似文献
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A distributed optical fiber disturbance detection system consisted of a Sagnac interferometer and a Mach-Zehnder interferometer
is demonstrated. Two interferometers outputs are connected to an electric band-pass filter via a detector respectively. The central frequencies of the two filters are selected adaptively according to the disturbance
frequency. The disturbance frequency is obtained by either frequency spectrum of the two interferometers outputs. An alarm
is given out only when the Sagnac interferometer output is changed. A disturbance position is determined by calculating a
time difference with a cross-correlation method between the filter output connected to the Sagnac interferometer and derivative
of the filter output connected to the Mach-Zehnder interferometer. The frequency spectrum, derivative and cross-correlation
are obtained by a signal processing system. Theory analysis and simulation results are presented. They show that the system
structure and location method are effective, accurate, and immune to environmental variations. 相似文献
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龙芬 《武汉职业技术学院学报》2013,12(1):90-92
提出了一个互相关的传感器系统的信号处理仿真。它是在LabVIEW虚拟仪器的基础上建立的,主要适用于主动声纳和雷迭系统相关接收器信号处理仿真,也可用于信号分析和教学中。并给出了实验过程及仿真结果。 相似文献
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运用传统的绝对地震定位方法, 结合波形互相关技术的相对定位方法(双差地震定位法), 对华北地区(110°~ 120°E, 35°~ 42°N)1993-2004和2007-2012年间发生的17 315次地震进行地震重定位研究.经过两次定位后得到11 453个地震的震源参数, 重定位后震中分布形态更加清晰, 向活动断裂两侧收缩, 与区域构造呈现出更加密切的关系.重定位后的地震震源深度主要集中在3~18 km范围内, 约占地震总数的88%, 表明华北地区的发震层主要位于中上地壳.约有97.6%的地震震源深度分布在0~23 km, 由此推测华北地区地震活动的下界面约为23 km.新河地区地震重定位后震中位置清晰地呈现出NNE向条带状分布, 与新河断裂的走向一致, 在垂直于新河断裂走向的剖面上, 地震震源呈现上陡下缓的"铲状"形态.在唐山地区地震重定位后地震分布表现为唐山、滦县和迁安3个震群, 在唐山断裂北段呈现出2条明显的断层, 东边断层比西边略深. 相似文献
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AN Ping ZHANG Zhao-yang School of Communication Information Engineering Shanghai University Shanghai China 《上海大学学报(英文版)》2000,(Z1)
1 IntroductionAfter many years of relative Obscurity,three-dimensional displays have recently become bothincreasingly pOPular and practical in the computerethics community. One way of shmulating 3Dperception is tO use a stereo paid, tWo images of the same.scene acquired horn different perspectives[']. There is ahigh degree of cross-correlation between the right and leftimages. For stereo images/video, the data cO~ssion isalso necessary, and the coding efficiency can be furtherimproved by ex… 相似文献
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Marius Sommer Charlotte Häger Louise Rönnqvist 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(1):1-16
The purpose of this study was to evaluate possible effects of synchronized metronome training (SMT) on movement dynamics during golf-swing performance, as captured by kinematic analysis. A one-group, between-test design was applied on 13 male golfers (27.5 ± 4.6 years old, 12.7 ± 4.9 handicap) who completed 12 sessions of SMT over a four-week period. Pre- and post-assessments of golf swings with three different clubs (4-iron, 7-iron, and pitching wedge) were performed using a three-dimensional motion capture system. Club velocity at three different swing phases (backswing, downswing, and follow-through) was measured and cross-correlation analysis of time-series signals were made on joint couplings (wrist–elbow–shoulder) of both arms, and between joints and the club, during the full golf swing. There were significantly higher cross-correlations between joint-couplings and concomitant changes of the associated phase-shift differences, as well as reduced phase-shift variability at post-test. No significant effect of SMT was found for the club velocities. We suggest that domain-general influences of SMT on the underlying brain-based motor control strategies lead to a more coordinated movement pattern of the golf-swing performance, which may explain previous observations of significantly improved golf-shot accuracy and decreased variability after SMT. 相似文献
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管道运输在现代社会生活中的作用日益显著,而管道泄漏的现象造成了资源的严重浪费,也污染了环境,因此,管道泄漏检测技术得到越来越多的重视。本文阐述了用相关原理进行管道泄漏检测的原理,给出了漏点定位的算法,并编写了相关程序,从理论上实现了对管道漏损位置的定位并实现了基于现代信号处理和自动化装置的检漏。 相似文献