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Proceedings Paper

High-resolution method for locating round objects in large-distortion image
Author(s): Zhanghua Huang; Hao Zhang; Meng Li; Huaiyu Cai
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Paper Abstract

Accurate object location is a key problem in image measurement system and the basis of other image processing procedures. In our project, we aim to locate some chromatic round objects in a large field. In this paper, the regions where the objects lie are isolated firstly from the original image using their color information, in which the edges of objects are detected. A novel fast method for fitting an ellipse to the edge points in the region is presented, by which the geometric distortion is calibrated by the ellipse model calculated linearly according to the position of the region. And the position of object with the precision of one pixel is obtained through edge fitting. Finally the accurate data in 1/5 pixel result from subpixel subdivision.

Paper Details

Date Published: 5 September 2002
PDF: 5 pages
Proc. SPIE 4921, Optical Manufacturing Technologies, (5 September 2002); doi: 10.1117/12.481738
Show Author Affiliations
Zhanghua Huang, Tianjin Univ. (China)
Hao Zhang, Tianjin Univ. (China)
Meng Li, Tianjin Univ. (China)
Huaiyu Cai, Tianjin Univ. (China)


Published in SPIE Proceedings Vol. 4921:
Optical Manufacturing Technologies
Yimo Zhang; Wenyao Liu; Harvey M. Pollicove, Editor(s)

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