14 April 2010 Pincushion distortion correction in x-ray imaging with an image intensifier
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Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 75223T (2010) https://doi.org/10.1117/12.851232
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore
Abstract
Image intensifier is widely used in X-ray imaging system for both radiography and tomography internal defects/structure inspections. A typical image intensifier comprises of a vacuum tube and a CCD camera. It is the combination of the CCD' s zoom function and the tube's dual-field capability that enables the device to achieve variable field-of-view and resolution. However, it is also because of this feature, it becomes difficult to correct the pincushion distortion of the image that is caused by the curvature of the input window of the tube. This paper will present a method that can dynamically correct this kind of distortion in a commercially available X-ray inspection system. With this method, the curvature of the tube input window is first calibrated with a calibration unit. Then with each image, three edge points of the input window are detected, from which both the radius and centre of the field of view are determined in pixel. These parameters are then used to map the distorted image into a correct image by establishing the transform relationship between them. This method can be fully automatic, therefore, it is able to be implemented on the existing system to directly display the distortion-corrected image of an object.
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Tong Liu, Tong Liu, A. A. Malcolm, A. A. Malcolm, Jian Xu, Jian Xu, } "Pincushion distortion correction in x-ray imaging with an image intensifier", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75223T (14 April 2010); doi: 10.1117/12.851232; https://doi.org/10.1117/12.851232
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