Measurement of six-degree-of-freedom kinematics of objects from high-speed film and video

John Lindegren; James W. Sherman

doi:10.1117/12.139143

19 January 1993 Measurement of six-degree-of-freedom kinematics of objects from high-speed film and video

John Lindegren, James W. Sherman

Proceedings Volume 1757, Ultrahigh- and High-Speed Photography, Videography, and Photonics; (1993) https://doi.org/10.1117/12.139143
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

Evaluating the aerodynamic design of moving objects, such as ordnance, is often done using high-speed imagery on film or videotape. The imagery must then be analyzed to determine the position and orientation of the object in each frame; from this data, the trajectory, acceleration, and other parameters of motion can be computed. In the past, the object's location was determined by human operators locating a few points or fiducial targets in each frame. A system for analyzing film images was developed based on a high resolution digital camera and a high performance image processing computer which, using a whole-object model, precisely locates objects in six degrees-of-freedom (6 DOF). Model-based image processing has been developed that substantially automates a manual three-dimensional (3-D) visualization process using two- dimensional (2-D), short focal length imagery. The model-based image processing algorithm has seven levels: (1) edge extraction; (2) edge modeling; (3) association of extracted edges with model components and measurement of displacement of edge pixels from them; (4) estimation of straight lines fit to each set of edge pixels; (5) qualification of extracted displacement equations based on self and mutual consistency; (6) estimation of object parameters and error statistics from one image; and (7) estimation of object parameters, trajectory, and error statistics from multiple viewpoints. Examples illustrate these steps of the image processing algorithms.

Citation Download Citation

John Lindegren and James W. Sherman "Measurement of six-degree-of-freedom kinematics of objects from high-speed film and video", Proc. SPIE 1757, Ultrahigh- and High-Speed Photography, Videography, and Photonics, (19 January 1993); https://doi.org/10.1117/12.139143

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KEYWORDS

Image processing

3D modeling

Error analysis

3D image processing

Model-based design

Algorithm development

Statistical modeling

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