Towards dynamic camera calibration for constrained flexible mirror imaging
Dunne, Aubrey K. and Mallon, John and Whelan, Paul F. (2008) Towards dynamic camera calibration for constrained flexible mirror imaging. In: OMNIVIS 2008 - The Eighth Workshop on Omnidirectional Vision, 17 October 2008, Marseille, France.
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Flexible mirror imaging systems consisting of a perspective
camera viewing a scene reflected in a flexible mirror can provide direct control over image field-of-view and resolution. However, calibration of such systems is difficult due to the vast range of possible mirror shapes
and the flexible nature of the system. This paper proposes the fundamentals of a dynamic calibration approach for flexible mirror imaging systems by examining the constrained case of single dimensional flexing.
The calibration process consists of an initial primary calibration stage followed by in-service dynamic calibration. Dynamic calibration uses a
linear approximation to initialise a non-linear minimisation step, the result of which is the estimate of the mirror surface shape. The method is
easier to implement than existing calibration methods for flexible mirror imagers, requiring only two images of a calibration grid for each dynamic
calibration update. Experimental results with both simulated and real data are presented that demonstrate the capabilities of the proposed approach.
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