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Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

Institutional price:	$586.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2005, Volume12

142 pages

DOI: 10.1615/JFlowVisImageProc.v12.i4

Issue price - $154.00

THE THREE-DIMENSIONAL RECONSTRUCTION BY FITTING A STEREO ADAPTER IN FRONT OF THE LENS OF A SINGLE HIGH-SPEED CAMERA AND ITS APPLICATION

C. X. Zhao
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Nengyuan Road, Wushan, 510640, P. R. China; Graduate University of Chinese Academy of Sciences, Beijing, 100039, P.R. China

J. L. Xu
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Nengyuan Road, Wushan, 510640, P. R. China

Y. Zhang
School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M60 1QD, UK

ABSTRACT

The three-dimensional reconstruction from two two-dimensional images was performed by setting a stereo adapter in front of the lens of a single high-speed camera. The stereo adapter consists of four plane mirrors that can be divided into two groups, forming the symmetrical optical structure. When the light from a single object is passing through the two groups of the plane mirrors, two images can be formed; these images are equivalent to those taken by two high-speed cameras. The corresponding matrices were obtained among the three coordinate systems. The three-dimensional reconstruction was acquired with the help of the computer version technique. The calibration process was to obtain intrinsic and extrinsic matrices. The length computed using the proposed hardware has the maximum error of 5.6% compared with its real value. The nonsymmetric behavior of the flapping amplitudes and frequencies of the two wings was obtained for the free turning process of the selected domestic fly. It is found that the flapping frequencies of the two wings are nearly the same, but the flapping amplitudes are different. The flapping trajectories of the two wings have the phase angles. The flapping amplitudes and the phase angles of the two wings are responsible for free turning of the tested fly. The present optical system is identified to be simple and useful, overcoming the limit of the symmetry flapping assumption of the two wings.