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A fast autofocus sharpness function of microvision system based on the Robert function and Gauss fitting 下载免费PDF全文
Xiaopeng Sha Pu Wang Peng Shan Huiguang Li Zhiquan Li 《Microscopy research and technique》2017,80(10):1096-1102
For the microvision system, a new autofocus evaluation function based on the Robert function is proposed by increasing the threshold value. Compared with the traditional evaluation function, the new focus function reduces the local extreme value and increases the steepness of the focusing curve. According to the characteristics of the focusing evaluation function, the focus curve can be divided into two stages: the gentle area and the steep area. In the gentle area, there will be set a large step‐length to realize the fast search. In the steep area, the data will be fitted by Gauss method, and on the basis of the fitting results, the motor of microvision system was directly driven to achieve the focal plane and this method has been improved in real‐time and accuracy. 相似文献
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MEMS三维静动态测试系统 总被引:11,自引:3,他引:8
采用集成频闪成像、计算机微视觉和显微干涉技术,研制了微机电系统(MEMS)三维静动态测试系统。系统可进行MEMS面内刚体运动、表面形貌、垂向变形和离面运动的测量。对于面内运动测量,提出了基于立方样条插值的亚像素步长相关模板匹配算法,从MEMS视觉图中提取面内位移,匹配精度为0.02pixels。对于离面运动测量,采用Hariharan 5步相移干涉(PSI)算法和去包裹算法,离面运动测量分辨率可达1nm。通过对Si微压力传感器膜和Si微陀螺仪的静动态测试,验证了系统的适用性和可靠性。 相似文献
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基于同态滤波的鲁棒多尺度微运动测量算法 总被引:1,自引:1,他引:0
针对光照变化、噪声、运动不连续及大位移量等影响基于计算机微视觉的微运动测量精度的问题,提出一种基于同态滤波的鲁棒多尺度微运动测量算法.首先采用同态滤波增强方法对显微视觉图像亮度不均匀进行了校正,并增强对比度,然后利用双权重函数,自动调节不同残差数据点的权重,去除残差过大的数据点,并采用多尺度金字塔由粗到精逐层迭代,精确地估计运动矢量.实验结果显示,新算法鲁棒性好,能有效地减弱光照不均匀的干扰,同时减少噪声和运动不连续而引起的界外值的影响,微运动测量精度达到0.01个像素. 相似文献
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LI Song AN Bing ZHANG Tong-jun XIE Yong-jun 《半导体光子学与技术》2006,12(3):173-177,210
Advanced testing methods for the dynamics of mechanical microdevices are necessary to develop reliable, marketable microelectromechanical systems. A system for measuring the nanometer motions of microscopic structures has been demonstrated. Stop-action images of a target have been obtained with computer microvision, microscopic interferometry, and stroboscopic illuminator. It can be developed for measuring the in-plane-rigid-body motions, surface shapes, out-of-plane motions and deformations of microstructures.A new algorithm of sub-pixel step length correlation template matching is proposed to extract the in-plane displacement from vision images. Hariharan five-step phase-shift interferometry algorithm and unwrapping algorithms are adopted to measure the out-of-plane motions. It is demonstrated that the system can measure the motions of solder wetting in surface mount technology(SMT). 相似文献
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