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Measurement process control by means of algorithms based on digital image processing

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4 Author(s)
P. Arpaia ; Dipt. di Ingegneria Elettrica, Univ. di Napoli Federico II, Italy ; G. Betta ; A. Langella ; E. Sacco

The real-time verification of the correct functioning of a measurement system is not only seldom performed, but also done using fairly ineffective statistical tools such as traditional Shewhart control charts. By considering measurement results reported in a control chart as a digital image, two digital-image-processing algorithms are proposed for the early fault diagnosis (detection and identification) of measurement processes. The first algorithm exploits a uniform-approximation technique to face mainly problems of the measurement process and/or instrument drifts. The second is based on the Hough transform to approach cyclic phenomena also for low signal-to-noise ratios. Results of the numerical characterisation and experimental validation demonstrate the practical applicability and the effectiveness of the proposed algorithms

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IEE Proceedings - Science, Measurement and Technology  (Volume:146 ,  Issue: 1 )