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Title of Journal: Machine Vision and Applications

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Abbravation: Machine Vision and Applications

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Springer-Verlag

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DOI

10.1002/pat.3581

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1432-1769

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Gamma/Xray linear pushbroom stereo for 3D cargo i

Authors: Zhigang Zhu YuChi Hu Li Zhao
Publish Date: 2008/10/14
Volume: 21, Issue: 4, Pages: 413-425
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Abstract

For evaluating the contents of trucks containers cargo and passenger vehicles by a nonintrusive gammaray or Xray imaging system to determine the possible presence of contraband threedimensional 3D measurements could provide more information than just 2D measurements In this paper a linear pushbroom scanning model is built for such a commonly used gammaray or Xray cargo inspection system Threedimensional 3D measurements of the objects inside a cargo can be obtained by effectively constructing a pushbroom stereo system using two such scanning systems with different scanning angles A simple but robust calibration method is proposed to find the important parameters of the linear pushbroom sensors Then a fast stereo matching algorithm is developed to obtain 3D measurements of the objects under inspection This algorithm is fully automatic based on freeform deformable registration An interactive user interface is designed for 3D visualization of the objects of interest Using the interactive tool the automatic algorithm is also compared with a very simple semiautomatic algorithm based on point correlation Experimental results of sensor calibration stereo matching 3D measurements and visualization of a 3D cargo container and the objects inside are presented

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