Special Section on Color in Texture and Material Recognition

Computer vision on color-band resistor and its cost-effective diffuse light source design

[+] Author Affiliations
Yung-Sheng Chen

Yuan Ze University, Department of Electrical Engineering, 135 Yuan-Tung Road, Chung-Li, Taoyuan 320, Taiwan

Jeng-Yau Wang

Yuan Ze University, Department of Electrical Engineering, 135 Yuan-Tung Road, Chung-Li, Taoyuan 320, Taiwan

National Chung-Shan Institute of Science and Technology, System Development Center, No. 481, 6th Neighborhood, Section Jia'an, Zhongzheng Road, Longtan, Taoyuan 325, Taiwan

J. Electron. Imaging. 25(6), 061409 (Jul 18, 2016). doi:10.1117/1.JEI.25.6.061409
History: Received February 15, 2016; Accepted June 27, 2016
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Abstract.  Color-band resistor possessing specular surface is worthy of studying in the area of color image processing and color material recognition. The specular reflection and halo effects appearing in the acquired resistor image will result in the difficulty of color band extraction and recognition. A computer vision system is proposed to detect the resistor orientation, segment the resistor’s main body, extract and identify the color bands, as well as recognize the color code sequence and read the resistor value. The effectiveness of reducing the specular reflection and halo effects are confirmed by several cheap covers, e.g., paper bowl, cup, or box inside pasted with white paper combining with a ring-type LED controlled automatically by the detected resistor orientation. The calibration of the microscope used to acquire the resistor image is described and the proper environmental light intensity is suggested. Experiments are evaluated by 200 4-band and 200 5-band resistors comprising 12 colors used on color-band resistors and show the 90% above correct rate of reading resistor. The performances reported by the failed number of horizontal alignment, color band extraction, color identification, as well as color code sequence flip over checking confirm the feasibility of the presented approach.

© 2016 SPIE and IS&T

Citation

Yung-Sheng Chen and Jeng-Yau Wang
"Computer vision on color-band resistor and its cost-effective diffuse light source design", J. Electron. Imaging. 25(6), 061409 (Jul 18, 2016). ; http://dx.doi.org/10.1117/1.JEI.25.6.061409


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