Acta Geodaetica et Cartographica Sinica ›› 2015, Vol. 44 ›› Issue (6): 663-669.doi: 10.11947/j.AGCS.2015.20130452

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A Systemic Algorithm of Elliptical Artificial Targets Identification and Tracking for Image Sequences from Videogrammetry

LIU Xianglei1,2, TONG Xiaohua3, MA Jing4   

  1. 1. School of Geomatics and Urban Information, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
    2. Key Laboratory for Urban Geomatics of National Administration of Surveying, Mapping and Geoinformation, Beijing 100044, China;
    3. College of Surveying and Geo-informatics, Tongji University, Shanghai 200092, China;
    4. Beijing Institute of Geo-engineering and Exploration, Beijing 100048, China
  • Received:2014-04-03 Revised:2015-03-09 Online:2015-06-20 Published:2015-07-28
  • Supported by:

    Foundation of Key Laboratory for Urban Geomatics of National Administration of Surveying, Mapping and Geoinformation (Nos.20131203NY;20131202NZ);Scientific Research Foundation of Beijing University of Civil Engineering and Architecture (No.00331614022)

Abstract:

In order to satisfy the requirement of identification and tracking the elliptical artificial targets fast and accurately for the image sequences from videogrammetric measurement for structural health monitoring, this paper proposes a systemic algorithm to identify and track the elliptical targets using the image block technique. The proposed method extracts the image block from original images to reduce the amount of data processing for the oval targets tracking. The mathematical morphology and elliptical geometric characteristics are integrated to eliminate the non-elliptical edge information to extract the elliptical contour in the range of image block. At last, the sub-pixel center location for elliptical artificial targets is acquired by the least square algorithm. The experimental results show that RMS error of 0.025 pixel can be achieved by the proposed method, furthermore, compared with the random Hough transform and template recognition algorithm, the tracking efficiency is improved over 5 times.

Key words: videogrammetric measurement, image block, ellipse identification, mathematical morphology, least square algorithm

CLC Number: