Share Email Print
cover

Proceedings Paper

Efficient detection and recognition algorithm of reference points in photogrammetry
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

In photogrammetry, an approach of automatic detection and recognition on reference points have been proposed to meet the requirements on detection and matching of reference points. The reference points used here are the CCT(circular coded target), which compose of two parts: the round target point in central region and the circular encoding band in surrounding region. Firstly, the contours of image are extracted, after that noises and disturbances of the image are filtered out by means of a series of criteria, such as the area of the contours, the correlation coefficient between two regions of contours etc. Secondly, the cubic spline interpolation is adopted to process the central contour region of the CCT. The contours of the interpolated image are extracted again, then the least square ellipse fitting is performed to calculate the center coordinates of the CCT. Finally, the encoded value is obtained by the angle information from the circular encoding band of the CCT. From the experiment results, the location precision of the CCT can be achieved to sub-pixel level of the algorithm presented. Meanwhile the recognition accuracy is pretty high, even if the background of the image is complex and full of disturbances. In addition, the property of the algorithm is robust. Furthermore, the runtime of the algorithm is fast.

Paper Details

Date Published: 29 April 2016
PDF: 10 pages
Proc. SPIE 9896, Optics, Photonics and Digital Technologies for Imaging Applications IV, 989612 (29 April 2016); doi: 10.1117/12.2225416
Show Author Affiliations
Weimin Li, Univ. of Science and Technology of China (China)
Gang Liu, Univ. of Science and Technology of China (China)
Lichun Zhu, National Astronomical Observatory (China)
Xiaofeng Li, Univ. of Science and Technology of China (China)
Yuhai Zhang, Univ. of Science and Technology of China (China)
Siyu Shan, Univ. of Science and Technology of China (China)


Published in SPIE Proceedings Vol. 9896:
Optics, Photonics and Digital Technologies for Imaging Applications IV
Peter Schelkens; Touradj Ebrahimi; Gabriel Cristóbal; Frédéric Truchetet; Pasi Saarikko, Editor(s)

© SPIE. Terms of Use
Back to Top