Title: A novel fuzzy logic approach to online exposure time calculation of line scan cameras in industrial inspection

Authors: Hossein Farid Ghassem Nia; Huosheng Hu; John Q. Gan

Addresses: School of Computer Science and Electronic Engineering, University of Essex, Colchester CO4 3SQ, UK ' School of Computer Science and Electronic Engineering, University of Essex, Colchester CO4 3SQ, UK ' School of Computer Science and Electronic Engineering, University of Essex, Colchester CO4 3SQ, UK

Abstract: Exposure time calculation is an essential issue for digital cameras used in sensitive and secure industrial inspections to capture high quality image and consequently realise reliable performance of image processing algorithms. In this paper, we propose a novel exposure time calculation algorithm for line scan cameras in sensitive industrial inspection to deal with the problems caused by a harsh and dynamic environment. Since failure in capturing high quality images will cause the image processing algorithm to fail, the proposed algorithm will automatically examine whether there is a need to change the exposure time and estimate the optimal exposure time. The median of scanned line and the centre of histogram distribution are input to a fuzzy system to determine the need for exposure time modification and optimise exposure calculation. Experiments were conducted to compare the proposed method with other existing methods, and the results have demonstrated the effectiveness and robustness of the proposed method.

Keywords: industrial inspection; line scan cameras; fuzzy logic; exposure time calculation; digital cameras; image processing; image quality; histogram distribution; exposure calculation; visual inspection.

DOI: 10.1504/IJMIC.2014.059388

International Journal of Modelling, Identification and Control, 2014 Vol.21 No.1, pp.8 - 16

Published online: 07 Jun 2014 *

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