IEEJ Transactions on Electronics, Information and Systems
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
<Speech and Image Processing, Recognition>
Research on Resistor Value Identification Using Image Recognition
—Method for Reducing the Effect of Specular Highlights Superimposed on Color-Code Image—
Shinsuke ShikamaHiroki Sugihara
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2016 Volume 136 Issue 11 Pages 1532-1540

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Abstract

Specular highlight, which is a direct reflection component of illumination light, is known to be an obstacle when reading color-codes of resistors using image recognition. We propose a method for avoiding the influence of specular highlight through image processing. We have set plural strip-shaped areas on color-codes and extract the color by selecting areas of smaller influence of reflection. We have implemented an algorithm of reading color-codes and conducted reading experiments of resistors having various angle of rotation, which have changing areas of specular highlights. As a result, we have confirmed an identification rate of 99%. We also discuss the changes of the influence of specular highlights due to the rotation of the resistors.

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© 2016 by the Institute of Electrical Engineers of Japan
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