2009 Volume 129 Issue 6 Pages 1010-1015
In this paper, the authors propose a method for thresholding a gray-scaled image. In the method, a threshold for a coordinate is set by an iteration that is composed of the pixels detection from neighboring area and a calculation of a candidate threshold using the detected pixels. The candidate threshold settles down to a value, because the detected pixels finally become invariable. Therefore, the method can set the threshold which follows up a light changing and a contrast changing. The proposed method and the conventional methods were tested, using a preceding car images of the inside and outside of a tunnel. We compared the method with other methods by an estimation based on a correlation on the thresholding. The result showed that the proposed method was stable relatively and set the good threshold continuously.
The transactions of the Institute of Electrical Engineers of Japan.C
The Journal of the Institute of Electrical Engineers of Japan