초록
본 연구에서는 안개 발생시 휘도에 따른 도로전광표지에 사용되는 색상별 판독거리 모형을 실험을 통하여 개발하였다. 이를 위하여 모의환경을 구축하였고, 휘도를 단계별로 증가시키면서 적색, 녹색, 황색의 판독거리 값을 파악하였다. 실험 결과, 적색은 시정거리 10m에서 휘도 2,000cd/㎡와 20,000cd/㎡ 일 때의 판독거리가 각각 10.2m와 18.8m로 84% 향상되었다. 시정거리 20m에서는 34%, 시정거리 30m에서는 17% 판독거리가 향상되었다. 녹색은 시정거리 10m에서 69%, 20m에서는 63%, 30m에서는 19% 판독거리가 향상되었다. 그리고 황색은 시정거리 10m에서 100%, 20m에서는 47%, 30m에서는 36% 판독거리가 향상되었다. 판독거리 산출 모형은 각 색상별 휘도값과 시정거리를 독립 변수로 하여 개발하였다. 추정된 적색, 녹색, 황색 모형식의 수정 결정계수는 각각 0.982, 0.978, 0.915로 계산되어 모든 모형의 설명력이 매우 높게 나타났다.
This study developed a legibility distance(LD) model for three colors used in VMS according to luminance under foggy conditions through experiments. For this, a simulated environment was created, and LD values of red, green, and yellow color were collected by increasing the luminance. From the test results, the LDs for red at luminance levels of 2,000 cd/㎡ and 20,000 cd/㎡ and a visibility distance of 10m were 10.2m and 18.8m, respectively, which was an improvement of 84%. The LD was improved by 34% and 17% at a visibility distance of 20 m and 30 m, respectively. For green, the LD was improved by 69%, 63%, and 19% at visibility distance of 10m, 20m, 30m, respectively. For yellow, the LD was improved by 100%, 47%, and 36% at visibility distance of 10m, 20m, 30m, respectively. The LD models for three colors were developed by using two independent variables, luminance value and visibility distance. The adjusted coefficients of the red, green, and yellow model equations were calculated as 0.982, 0.978, and 0.915, respectively, and the explanatory power of all models was very high.