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Proceedings Paper

A GPU based real-time image processing for an axis-symmetrical optical laser triangulation system
Author(s): Pedro D. V. Buschinelli; Gabriel A. B. Landeira; Christian Kohler; Armando Albertazzi; Guilherme B Teixeira da Silva
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Paper Abstract

An axis-symmetrical optical laser triangulation system was developed by the authors to measure the inner geometry of long pipes used in the oil industry. It has a special optical configuration able to acquire shape information of the inner geometry of a section of a pipe from a single image frame. It uses a radial light sheet and conical triangulation to measure the inner geometry of pipes in cylindrical coordinates. A set of equally spaced images of 1024 x 1024 pixels is acquired at 50 Hz while the device is moved along the pipe’s axis. The measured geometry is analyzed to identify defects like corrosion damage. A GPU based processing algorithm has been developed to make the system able to process these images and display the geometrical/measurement result in real-time. The algorithm implements an adaptive threshold filter and a light intensity peak search using a graphic processing unit programming architecture (CUDA). Prior to the parallel algorithms (called kernels) a texture data type is used to remap the image, converting from polar to Cartesian coordinates, mapping angular and radial values in a 2D pixel data matrix. Radial lines are only scanned in a limited range (256 pixels) between a minimum and a maximum radius value. The achieved image processing frequency is about 470 frames per second (FPS) using a notebook equipped with a GTX 285m graphics card.

Paper Details

Date Published: 15 October 2012
PDF: 10 pages
Proc. SPIE 8498, Optics and Photonics for Information Processing VI, 849802 (15 October 2012); doi: 10.1117/12.930181
Show Author Affiliations
Pedro D. V. Buschinelli, Federal Univ. of Santa Catarina (Brazil)
Gabriel A. B. Landeira, Federal Univ. of Santa Catarina (Brazil)
Christian Kohler, Univ. Stuttgart (Germany)
Armando Albertazzi, Federal Univ. of Santa Catarina (Brazil)
Guilherme B Teixeira da Silva, Federal Univ. of Santa Catarina (Brazil)


Published in SPIE Proceedings Vol. 8498:
Optics and Photonics for Information Processing VI
Abdul A. S. Awwal; Khan M. Iftekharuddin, Editor(s)

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