SHAPE CORRECTION ALGORITHM BY COMPARING SHAPE SILHOUETTE-LINES WITH A SINOGRAM

Trung Vuong Pham, Yutaka Ohtake, Yukie Nagai, Hiromasa Suzuki

Abstract

In industrial X-ray CT application, there is an increasing demand for achieving accurate surface reconstruction of measured objects for dimensional inspection of mechanical parts since the performance of industrial X-ray CT scanners is considerably improved. In this paper, we propose a novel method that reuses X-ray projection images, or a sinogram, to improve the accuracy of the reconstructed surface mesh by correcting the CT values, which is done by fitting silhouette- lines of the mesh to the sinogram. The sinogram is conventionally used only for obtaining a CT volume data, or a tomogram. Since it has become capable to extract the silhouette-lines correctly regardless of beam hardening etc., reusing the sinogram has the potential application for improving the accuracy of the reconstructed mesh.

Keywords

X-ray computed tomography, shape silhouette-lines, shape correction

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DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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