AUTOMATIC INSPECTION OF DRILL-HOLES AND THREADS

C. Eitzinger, J. Kastner

Abstract

Due to the cylindrical shape of drill-holes and inner threads the acquisition of high-resolution images has not yet been solved satisfactorily. Different possibilities for taking pictures from the inside of a drilled hole are reviewed and evaluated with respect to the quality of the images. Results show, that a ring-shaped CMOS-Sensor works best for the purpose of automatic inspection.<BR />Additionally, the analysis of these images requires a special algorithmic approach, which is able to take care of the cylindrial shape of the object. To achieve this, the use of the Z-transformation is recommended for processing of such images, and it is shown to be superior to other image processing operators.

Keywords

automatic inspection, inner threads, technical diagnostic

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IMEKO-WC-2000-TC14-P365.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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