METHOD FOR DETERMINING THE EDGE ON THE IMAGE OF CYLINDRICAL OBJECTS IN THE SHADOW METHOD OF DIMENSIONAL CONTROL
S. V. Dvoynishnikov, V. V. Rakhmanov, I. K. Kabardin, V. G. Meledin, D. O. Semenov
Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: diameter measurement, telecentric optics, digital image processing
Abstract
A projection shadow method for measuring the diameter of cylindrical objects under conditions of a limited dynamic range of a photodetector is proposed. The method involves the use of telecentric optics and an incoherent light source. The method is based on determining the position of the edge of the object in the image based on the position of the maximum of the derivative of the intensity dependence. Theoretical and experimental estimates of the error of the proposed method are carried out. The error of measuring the diameter of cylindrical objects at the level of 0.3 * 10⁻⁵ has been achieved. The result obtained confirms the efficiency and prospects of the proposed method.
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