• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.21 no.4
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• pp.190-211
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• 2022

This study investigated the effect of the shape and height of road signs on detection performance when detecting road signs with LiDAR, which is recognized as an essential sensor for autonomous vehicles. For the study, four types of road signs with the same area and material and different shapes were produced, and a road driving test was performed by installing a 32Ch rotating LiDAR on the upper part of the vehicle. As a result of comparing the shape of the point cloud and the NPC according to the shape of the road sign, It is expected that a distance of less than 40m is required to recognize the overall shape of a road sign using 32Ch LiDAR, and shapes such as triangles and rectangles are more advantageous than squares in securing the maximum point cloud from a long distance. As a result of the study according to the height of the road sign, At short distances (within 20m), if the height of the sign is raised to more than 2m, it deviates from the vertical viewing angle of the LiDAR and cannot express the complete point cloud shape. However, it showed a negligible effect compared to the near-field height change. These research results are expected to be utilized in the development of road facilities dedicated to LiDAR for the commercialization of autonomous cooperative driving technology.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.943-945
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• 2005

교통 표지판은 안전하고 효율적인 주행을 위해 운전자에게 여러 가지 정보를 제공한다. 따라서 교통 표지판의 자동인식은 자동운전이나 안전운전 시스템 등에 중요하게 사용될 수 있다. 본 논문은 영상에서 나타난 여러 가지 도로시설물 중 교통 표지판을 인식하는 알고리즘을 제안한다. 제안된 알고리즘은 교통 표지판이 가지고 있는 색상, 밝기, 형태 등의 정보를 이용하여 교통 표지판을 자동으로 인식한다. 일반적인 영상처리에서는 RGB 색상 공간의 처리는 간단하지만 날씨나 조명 상태의 변화에 민감하므로 본 논문에서는 색상과 채도에서 컬러 인지력이 높은 HSI 공간을 활용하여 주변 환경의 영향을 줄였다. 또한 고속 인식을 위하여 영상 모멘트 템플릿 정합을 사용하여 신경 회로망을 구성하였다.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2001.05a
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• pp.117-118
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• 2001

교통지리정보시스템(TGIS:Traffic Geographic Information System)은 지리정보시스템의 서브시스템으로서 도로교통법 상에 규정된 신호기, 노면표시, 도로표지와 중앙분리대, 방호책, 도로 반사경, 기타 시설물과 같이 지상에 설치된 교통안전시설물을 관리한다. 이 연구에서는 교통지리정보를 위하여 교통안전시설물 관리시스템을 설계하고 구현하였다. 아울러 시스템의 구현 방법을 제시하고 구현된 결과르 실제 현상에 적용시켰다.

• Proceedings of the KOR-KST Conference
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• 2007.05a
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• pp.409-413
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• 2007

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.4A
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• pp.216-223
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• 2003

This study concerns implementation of the roadstud traffic-signal system with RF wireless telecommunication. It is used for improving the problem and limit of the roadstud that currently being used simply for leading deceleration of vehicles and indicating center line of roads. With the use of wireless roadstud traffic signal system, not only it is possible to improve the problem and limit of the currently being used roadstud but also it is possible to reduce installing and repairing fee of it.

• Journal of Korean Society of Transportation
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• v.35 no.2
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• pp.129-142
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• 2017

Accident Black Spot Improvement Project is the representative road safety intervention to eliminate environmental risk factors on the roadway by installing road safety facilities. Although it is one of the main road safety projects in Korea, there has been a lack of effort analyzing the traffic accident reduction effects of this project. In this study, therefore, we selected 4,171 road black spots from 2004 to 2013 and investigated the traffic accident reduction effects of 5 road safety facilities by using "Comparison Group(C-G)" method. Through the analysis, it was found that the number of traffic accidents were lowered by 4.45% with traffic islands, 32.17% with road paved markers, and 24.13% with speed cameras, respectively. However, 0.61% with pedestrian fencing and 1.67% with skid resistant pavement were increased on the other hand. In addition, we also analyzed traffic accident reduction facilities' performance on specific types of collision mentioned in manual on road safety facilities by Ministry of Land, Infrastructure and Transport. It was shown that the number of bad weather traffic accidents were reduced by 52.96% with road paved markers, pedestrians accidents were reduced by 62.77% with pedestrian fencing and rear-end collisions were reduced by 26.00% with skid resistant pavement.

• Journal of Korean Society for Geospatial Information Science
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• v.19 no.3
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• pp.91-98
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• 2011

Road signs are part of the traffic facilities intended to guide drivers to their destinations in a safe and comfortable manner. Due to the creation of new routes, changes to the old routes, and the deterioration of road signs, road signs do require efforts to do ongoing field investigations and put the results in a database. The purpose of this study was to propose methodologies to do field investigations and build a database for road signs efficiently. For that purpose, a mobile mapping system was designed for field investigations. The designed mobile mapping system was comprised of three cameras to produce image information about road signs, GPS/IMU/DMI to obtain information about the position and attitude of a vehicle, and a laser scanner to generate information about the locations of road signs and routes. Also proposed in the study was a procedure to automatically detect the areas of road signs in the road signs images and recognize their characters.

• The Journal of the Korea Contents Association
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• v.15 no.8
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• pp.69-76
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• 2015

With Various signs are installed at roadside to display the message which rather confuse the drivers. The technologies using advanced lighting system and LED have improved the visibility at nighttime but the problems with plural signs have yet to be resolved. In order to solve this problem, LED and the prismatic variable message sign have been applied. But, they have been provided limited information by the display limit. This research conducted to study patent and technical trend of the existing variable message signs to understand the present technology. And, we suggested next generation display to improve providing information. Therefore, we conducted to compare the LED and the OLED by technical and economical literature review. Also, this research conducted test of luminance contrast about the LED and the OLED display in order to understand the possibility of replacing road signs.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.1286-1288
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• 2002

본 연구에서는 차세대 교통체계인 첨단교통 시스템(ITS)에서 차량 운전자 및 도로이용자에게 도로 및 교통정보를 제공하기 위하여 설치 및 운영되고 있는 도로전광표지(Variable Message Sign : VMS)의 시인성을 분석하기 위하여, 가장 중요한 기초 변수인 휘도와 색도를 측정하였다. 측정치를 통하여 VMS의 휘도와 색도가 시인성을 판별할 수 있는 성능 인자로써 가능한지를 검토하고, 향후 VMS 시스템의 설치 및 관리 기술에 실무요령의 활용 여부를 검토한다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.1
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• pp.185-194
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• 2014

This study investigates the methodology to evaluate the quantified performance of pavement markings and traffic guide signs using digital images. This methodology is significant to attempt to quantify their performance without large brightness photometer at the nighttime and bad weather. The retroreflective performance of pavement markings are evaluated through the contrast of gray levels of pavements and markings in collected digital images under the case of rain, dampness, and dryness. In addition, the appraisal of retroreflective performance of traffic guide signs are implemented through the comparison between interior illuminated and the existing retroreflective traffic guide signs using the contrast of luminance extracted from the value of RGB of backgrounds and legends in collected digital images according to geometric design, driving lanes, and the distance between the car and the sign. As a result, the retroreflective performance of pavement markings deteriorates about 3.5 times and 2 times under the case of rain and dampness respectively than dryness. Also, the performance of the existing traffic guide signs is significantly influenced by geometric design, driving lanes, and the distance, otherwise interior illuminated traffic guide signs. This methodology can be utilized to construct objective information of performance of traffic safety facilities to select appropriate position of expensive high reflective pavement markings and interior illuminated traffic guide signs considering diverse weather and geometric design.