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Proceedings Paper

Automatic positioning method based on feature points matching for ICF target
Author(s): Bing-guo Liu; Guo-dong Liu; Na Gong; Feng-Dong Chen; Zhi-tao Zhuang
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Paper Abstract

This paper persents an laser and target alignment sensor (LTAS) used to automaticlly position for the ICF experimental target. LTAS which is based on optical conjugate principle can locate the targets online with its four imaging measurement systems. For the requirement of automatic positioning, presents a new method which is called offline test and online match method. With the help of target offline test device, the reference image features are provided, online images and reference images are matched in real time based on images point features, SIFT descriptors are used for extracting target feature from image which is invariant features to image scale and rotation. According to image feature, we modify the original feature vectors with 128 dimensions to a feature vectors with 32 dimensions. A fast nearest neighbor algorithm is used for feature match, and the Best-Bin-First (BBF) algorithm is used to search nearest neighbors of points, and then RANSAC algorithm is used to remove the mismatch points, A least-squares solution is used to calculate parameters between the reference image and the online image, according to the matching parameters, the target is automatic adjusted to proper attitude. By matching experiment, the position matching accuracy is within 1 μm, the angle matching accuracy is within 0.1 degree, matching time cost is less than 1 second, and meets the real-time matching requirements.

Paper Details

Date Published: 31 January 2013
PDF: 6 pages
Proc. SPIE 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation, 87591C (31 January 2013); doi: 10.1117/12.2014737
Show Author Affiliations
Bing-guo Liu, Harbin Institute of Technology (China)
Guo-dong Liu, Harbin Institute of Technology (China)
Na Gong, Harbin Institute of Technology (China)
Feng-Dong Chen, Harbin Institute of Technology (China)
Zhi-tao Zhuang, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 8759:
Eighth International Symposium on Precision Engineering Measurement and Instrumentation
Jie Lin, Editor(s)

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