Line-scan system for all-round inspection of objects

Anastasios N. Zographos; J. Paul Owain Evans; Simon X. Godber; Max Robinson

doi:10.1117/12.279789

7 July 1997 Line-scan system for all-round inspection of objects

Anastasios N. Zographos, J. Paul Owain Evans, Simon X. Godber, Max Robinson

Proceedings Volume 3174, Videometrics V; (1997) https://doi.org/10.1117/12.279789
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

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.

Citation Download Citation

Anastasios N. Zographos, J. Paul Owain Evans, Simon X. Godber, and Max Robinson "Line-scan system for all-round inspection of objects", Proc. SPIE 3174, Videometrics V, (7 July 1997); https://doi.org/10.1117/12.279789

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