Digitization of witness pack plates
conference paper
In order to replace the laborious task of estimating the area of holes in witness pack plates manually, an attempt is made to apply digital image processing to count all the holes, determine their position and measure their size from a single recording of a plate, made by a digital camera. Processing all the plates of a pack enables one to estimate indirectly the fragment mass and velocity of behind armour debris. This paper describes the set-up and calibration procedure, for obtaining the correct area and position of the holes. Corrections are made for the shading effect of the camera optics as well as for the inhomogeneous light distribution of the light table above which the plates are positioned. Acalibration plate is designed to be used as a reference object to convert measured grey values to hole diameters. Finally the results are given of calculations performed on a real plate.
TNO Identifier
183647
Source title
19th International Symposium on Ballistics, Interlaken, Switzerland, 7-11 May 2001
Pages
953-951 (VM10)
Files
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