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Machine Vision and Applications

, Volume 21, Issue 4, pp 413–425 | Cite as

Gamma/X-ray linear pushbroom stereo for 3D cargo inspection

  • Zhigang Zhu
  • Yu-Chi Hu
  • Li Zhao
Original Paper

Abstract

For evaluating the contents of trucks, containers, cargo, and passenger vehicles by a non-intrusive gamma-ray or X-ray imaging system to determine the possible presence of contraband, three-dimensional (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 gamma-ray or X-ray cargo inspection system. Three-dimensional (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 free-form 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 semi-automatic 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.

Keywords

Pushbroom imaging Automatic 3D measurements Stereo matching Cargo inspection Homeland security 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Department of Computer ScienceThe City College of New York/CUNYNew YorkUSA
  2. 2.PhD Program in Computer ScienceThe CUNY Graduate CenterNew YorkUSA
  3. 3.Department of Medical PhysicsMemorial Sloan-Kettering Cancer CenterNew YorkUSA
  4. 4.PhD Program in EconomicsThe CUNY Graduate CenterNew YorkUSA

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