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Proceedings Paper

Line-scan system for all-round inspection of objects
Author(s): Anastasios N. Zographos; J. Paul Owain Evans; Simon X. Godber; Max Robinson
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Paper Abstract

Sensor choice is critical in all object inspection imaging systems and the suitability of different types of sensor must be thoroughly assessed before a decision is made. Despite its wide use, a television type camera may not represent the best choice for certain object inspection applications. Specifically, when inspection of an object that has a degree of cylindrical symmetry is required, a line-scan camera is a viable alternative to the television type and, in general, any matrix camera, offering a number of unique advantages. By applying rotational motion to the object of interest and using a line-scan device, an 360 degree(s) view of the object is obtained. The cylindrical surface of the object is effectively unfolded into a planar 2D one, allowing for the efficient inspection of the entire surface of the object from a single, continuous image. To allow accurate object space co-ordinate measurement, a line-scan camera calibration technique has been developed, catering for both interior and exterior parameter calibration. The former accounts for the lens effective focal length, the pierce-pixel value and the timing of the line-scan camera, while the latter yields the relative position and orientation of the camera with respect to a reference object space co-ordinate system.

Paper Details

Date Published: 7 July 1997
PDF: 9 pages
Proc. SPIE 3174, Videometrics V, (7 July 1997); doi: 10.1117/12.279789
Show Author Affiliations
Anastasios N. Zographos, Nottingham Trent Univ. (United Kingdom)
J. Paul Owain Evans, Nottingham Trent Univ. (United Kingdom)
Simon X. Godber, Nottingham Trent Univ. (United Kingdom)
Max Robinson, Nottingham Trent Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 3174:
Videometrics V
Sabry F. El-Hakim, Editor(s)

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