2016 Volume 136 Issue 11 Pages 1532-1540
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.
The transactions of the Institute of Electrical Engineers of Japan.C
The Journal of the Institute of Electrical Engineers of Japan