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Applied Optics

Applied Optics


  • Vol. 40, Iss. 20 — Jul. 10, 2001
  • pp: 3326–3333

Large-scale three-dimensional object measurement: a practical coordinate mapping and image data-patching method

Wansong Li, Xianyu Su, and Zhongbao Liu  »View Author Affiliations

Applied Optics, Vol. 40, Issue 20, pp. 3326-3333 (2001)

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In a practical three-dimensional (3-D) sensing system, the measurement of a large-scale object cannot be completed in only one operation. A relieflike object is generally divided into several subregions, an optical sensor positioned at each of these locations, and the shape of the whole object obtained by patching together all the 3-D data of the subregions. It is important to have accurate 3-D coordinates (x, y, z) for each subregion. We propose a new phase-to-height mapping algorithm and an accurate lateral coordinate calibration method with which to obtain the 3-D coordinates. After all the subregions are measured, it is necessary to transform the local coordinates into global world coordinates; here we present a new image data-patching method based on a flood algorithm. This method provides the optimal path along which to patch all the subregions into the shape of the entire object. We have measured and successfully patched a large sandy pool (9 m × 5 m), and the reliability and feasibility of our method have been demonstrated by experiment.

© 2001 Optical Society of America

OCIS Codes
(100.3010) Image processing : Image reconstruction techniques
(110.6880) Imaging systems : Three-dimensional image acquisition
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

Original Manuscript: October 10, 2000
Revised Manuscript: March 13, 2001
Published: July 10, 2001

Wansong Li, Xianyu Su, and Zhongbao Liu, "Large-scale three-dimensional object measurement: a practical coordinate mapping and image data-patching method," Appl. Opt. 40, 3326-3333 (2001)

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