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Proceedings Paper

An effective data acquisition system using image processing
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Paper Abstract

The authors investigate a data acquisition system utilising the widely available digital multi-meter and the webcam. The system is suited for applications that require sampling rates of less than about 1 Hz, such as for ambient temperature recording or the monitoring of the charging state of rechargeable batteries. The data displayed on the external digital readout is acquired into the computer through the process of template matching. MATLAB is used as the programming language for processing the captured 2-D images in this demonstration. A RC charging experiment with a time characteristic of approximately 33 s is setup to verify the accuracy of the image-to-data conversion. It is found that the acquired data matches the steady-state voltage value displayed by the digital meter after an error detection technique has been devised and implemented into the data acquisition script file. It is possible to acquire a number of different readings simultaneously from various sources with this imaging method by placing a number of digital readouts within the camera's field-of-view.

Paper Details

Date Published: 6 December 2005
PDF: 8 pages
Proc. SPIE 6051, Optomechatronic Machine Vision, 60511A (6 December 2005); doi: 10.1117/12.649103
Show Author Affiliations
Chung-How Poh, Univ. of South Australia (Australia)
Chung-Kiak Poh, Edith Cowan Univ. (Australia)

Published in SPIE Proceedings Vol. 6051:
Optomechatronic Machine Vision
Kazuhiko Sumi, Editor(s)

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