• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.21 no.5
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• pp.135-140
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• 2021

In this paper, we propose an on-line mechanism that simultaneously detects cracks and profiling pavement blocks to detect the displacement of ground surface adjacent to the excavation in the urban area. The proposed method utilizes a 2D laser to profile the information about pavement blocks including the depth and distance among them. In particular, it is designed to enable the detection of cracks and portholes at runtime. For the experiment, real data was collected through Gocator, and trainng was carried out using Faster R-CNN. The performance evaluation shows that our detection precision and recall are more than 90% and the pavement blocks are profiled at the same time. Our proposed mechanism can be used for monitoring management to quantitatively detect the level of excavation risk before a large-scale ground collapse occurs.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.01a
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• pp.265-268
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• 2011

본 논문은 시각 장애인 및 보도 보행에 어려움을 갖는 사람들에게 안전한 보도 보행을 돕기 위한 보도 및 차도 영역 추출을 위해 보도 및 차도의 라인검출 기법을 제안한다. 사람의 눈높이에서 영상을 취득, 자연영상에서 입력된 잡음 및 노이즈를 제거하고, 캐니 에지 맵 추출, 허프 변환을 통해 보도/차도의 라인을 추출한다. 추출된 라인은 본 논문에서 제안한 방법으로 유효라인을 얻게 되며, 얻어진 유효 라인의 교점을 통해 소실점 영역을 생성, 이후 추출되는 라인의 기준이 된다. 제안된 방법은 자연영상의 보도 위치에서 보도와 차도의 올바른 라인을 추출하는데 강인함을 실험을 통해 검증하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2010.07a
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• pp.121-124
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• 2010

본 논문은 시각 장애인 및 보도 보행에 어려움을 갖는 사람들에게 안전한 보도 보행을 돕기 위한 보도 및 차도 영역 추출을 위해 보도 및 차도의 라인검출 기법을 제안한다. 사람의 눈높이에서 영상을 취득, 자연영상에서 입력된 잡음 및 노이즈를 제거하고, 캐니 에지 맵 추출, 허프 변환을 통해 보도/차도의 라인을 추출한다. 추출된 라인은 본 논문에서 제안한 방법으로 유효라인을 얻게 되며, 얻어진 유효 라인의 결합으로 삼각 표본을 생성하여 보도의 영역을 추출 하게 된다. 제안된 방법은 자연영상의 보도 위치에서 보도와 차도의 올바른 라인을 추출하는데 강인함을 실험을 통해 검증하였다.

• Journal of Institute of Control, Robotics and Systems
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• v.18 no.1
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• pp.62-68
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• 2012

In this paper, a detection method of a pedestrian safety road marking was proposed. The proposed algorithm uses laser range and reflectivity of a range finder (LRF). For a detection of crosswalk marking and stop line, the DFT (Discrete Fourier Transform) of reflectivity and cross-correlation method between the reference replica and the measured reflectivity are used. A speed bump is detected through measuring an altitude difference of two LRFs which have the different tilted angle. Furthermore, we proposed a velocity constrained a detection method of a speed bump. Finally, the proposed methods are tested in on-line, on the pavement of a road. The considered road markings are wholly detected. The localization errors of both road markings are smaller than 0.4 meter.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1995.04a
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• pp.316-323
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• 1995

This paper presents an image processing technique to get traffic information such as vehicle volume, velocity, and occupancy for measuring the traffic congestion rate. To obtain these information, two horizontal lines are previously set on the screen. A moving vehicle is detected using the gray level difference on each line, and also template matching method at night. Threshold values are determined by sampling pavement grey level, and updated dynamically to cope with the change of ambient light conditions. These technique is successfully used to calculate vehicle volume, occupancy, and velocity. This study can be applied to traffic signal control system for minimizing traffic congestion in urban areas.

• Korean Journal of Construction Engineering and Management
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• v.14 no.4
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• pp.164-171
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• 2013

In urban planning, road facility is used not only for the transportation purpose but also for the utility line space purpose such as electrical, gas, tele communication, heating, water, sewer, and so on. However, since these utilities are built by many different groups, it becomes very difficult to communicate each other. Delay in one party can cause another party's schedule delay but they don't commuicate often. Also, some delay in utility work can cause frequent pavement cut. And, this will impact on construction cost, schedule delay, low quality, user complain and cost. This study developed spatiotemporal decision model to prevent prequent utility cut for mega project such as new urban development project. In addition, this study developed utility cut management system to manage utility cut schedule under pavement. Finally, developed system was applied to new urban development project and verified there effectiveness.