An auto-focusing algorithm for accurate azial location of particle
Resolution of particle axial position is lower and uncertainty due to the impact of zero-order image, twin image and depth of focus,which is tens of times more than particle diameter in digital in-line Fresnel holography system. An auto-focusing algorithm based on the most gradient for accurate location of particle was proposed. Because the real gradient direction for the edge of particle may not be the appointed direction, hence the gradients in all possible directions is calculated and chosen the largest gradient as the result. At the same time, in order to improve the precision and stability of auto-focusing algorithm, another threshold parameter is introduced. Through experiments, we find out that the algorithm has the characteristics such as strong single peak feature and good stability.
digital holography depth of focus particle azial location
LI Zhibin ZHENG Gang ZHANG Lixin
School of Optical-Electrical and Computer Engineering College of Power Engineering, University of Sh School of Optical-Electrical and Computer Engineering b College of Power Engineering, University of Faculty of Electric and Automatic Engineering, Shanghai University of Electric Power, Shanghai, Chin
国际会议
第八届国际测试技术研讨会(8th International Symposium on Test and Measurement)
重庆
英文
2938-2941
2009-08-01（万方平台首次上网日期，不代表论文的发表时间）