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Proceedings Paper

Shape inspection system with real-time adaptation to the luminance of the objects
Author(s): Daniel F. Garcia; Ruben Usamentiaga; Ignacio Marin; Juan A. Gonzalez; Nicolas de Abajo
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Paper Abstract

This work presents an automated shape inspection system for 2D objects with variable luminance. The system installed in the steel industry, captures linear images of plates at high temperature (700 - 1200 degree(s)C) while they are moving on a roll path. The main objective of the system is to capture the shape of the head and tail of the plates. These shapes are used to optimize the rolling parameters of the plate mill in order to minimize waste. The radiation generated by the plates in the visible and infrared zones of the spectrum (largely dependent on their temperature) is directly captured by the linear camera of the system with no additional artificial illumination. While most of the research work has been focused on obtaining the optimal illumination for the objects inspected, this work deals with the particular case of objects which irradiate their own light. This system automatically adapts itself to acquire images of plates with different levels of luminance using a mechanisms that calculates the proper exposure time to acquire each image. The mechanism integrates two basic actions: a feedforward control and an adaptive feedback control loop.

Paper Details

Date Published: 4 April 2001
PDF: 12 pages
Proc. SPIE 4301, Machine Vision Applications in Industrial Inspection IX, (4 April 2001); doi: 10.1117/12.420914
Show Author Affiliations
Daniel F. Garcia, Univ. of Oviedo (Spain)
Ruben Usamentiaga, Univ. of Oviedo (Spain)
Ignacio Marin, Univ. of Oviedo (Spain)
Juan A. Gonzalez, Aceralia Steel Corp. (Spain)
Nicolas de Abajo, Aceralia Steel Corp. (Spain)


Published in SPIE Proceedings Vol. 4301:
Machine Vision Applications in Industrial Inspection IX
Martin A. Hunt, Editor(s)

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