|
|
|
| Visibility Detection Algorithm Based on Optimization of Squared Differences upon Apparent Luminance of Roads |
| Wu Wei Li Bo Yang Xian Duan Jin-ming Chen Qi-mei |
| School of Electronic Science and Engineering, Nanjing University, Nanjing 210046, China |
|
|
|
|
Abstract In order to solve the deficiency of existing visibility detection methods, this paper presents a novel algorithm by working out the least square calculated from apparent luminance of roads. First, on the basis of camera self-calibration, the region of interest with constant height and even illumination is extracted. Then apparent luminance values of roads are figured out as real reference values. After that, an initial value of extinction coefficient is selected properly, with which a series of apparent luminance values are calculated according to Koschmieder theory. Finally, the objective function of extinction coefficient optimization is established based on the least square between calculated values and reference values of apparent luminance. Experimental results show that the proposed visibility detection algorithm has high accuracy, fast speed, fine robustness and broad application prospects.
|
|
Received: 07 November 2013
|
|
|
|
Corresponding Authors:
Wu Wei
E-mail: wuwei_0730@yeah.net
|
|
|
|
|
|
|
2014, Vol. 36 
