Ja-Young Yoon

A Method of Counting Pedestrians in Crowded Scenes

This paper proposes a method to automatically count the number of pedestrians in a video input of a crowed scene. The method proposed in this paper improves on our previous pedestrian counting method which estimates the number of pedestrians by accumulating low-level features (foreground pixels and motion vectors) on a virtual gate. To handle crowded scenes, the pedestrian counting process in this paper is weighted by the ratio of foreground pixels in the scene. The relationship between crowdedness and weighting factor is learned from 10,000 simulation images. Tests on real video sequences show that this method can successfully estimate the number of pedestrians with an accuracy of about 95%. Also, when compared to the previous method, the accuracy was increased by about 5% for highly crowded scenes. Moreover, the proposed method runs at an average rate of around 60 fps on a standard PC, which makes the algorithm realistic for multi-camera systems.

A Conceptual Model of Intelligent Program Management Information Systems (iPMIS) for Urban Renewal Mega Projects in Korea

Abstract This paper is about intelligent Program Management Information System (iPMIS) to support decision-making and management of urban renewal mega projects over their life cycle in Korea. Program management focuses on soft issues i.e. benefits, stakeholders, and governance. A challenge is the diversity of urban renewal projects in terms of process and organization structure. The authors clarify the general requirements of systems to support program management while coping with diversity as follows: openness, clearness, convenience and consistency. As solutions, the authors present a conceptual model for iPMIS featuring the following characteristics: a web-based platform in which general modules and external integrated Geographic Information System (GIS) with decision support logical models are operated; interfaces; cooperative operating IT and IS in urban planning and construction; and a protocol for managing data cooperatively at the level of nation, district, project and facility. Two main unique features are: a user-created ontological process map that provides the operation scenario and menus of the iPMIS; and plug & play techniques by which modules are selected and then operated immediately. These core concepts have been implemented as a prototype system and have been applied to a real construction project. The evaluation result shows that this technique can reduce systems implementation time by 90%.

Pedestrian Counting Using an IR Line Laser

This paper presents a method of pedestrian counting using an IR line laser. In the proposed method, only reflection of IR line laser onto pedestrians is obtained using an IR filter. Hence acquisition of moving object images is extremely simple and reliable compared to other vision-based method. The number of pedestrians is counted using simple blob analysis and their moving directions are obtained from slopes of the blobs. Experiments showed that the proposed method is able to count the number of pedestrians effectively (with accuracy of about 95%) and efficiently (9 ms for one frame on a standard PC).

Prototype Development of a Spatial Information Management System for Large-Scale Buildings

This paper presents a new model of a management system for large-scale buildings that aims to deal with both static and dynamic spatial information. For this purpose, 3D CAD, 3D GIS and image processing are integrated. The geometrical information of a building is managed by GIS using a database built from 3D CAD. Also, the dynamic spatial information of a building (i.e., flow size of pedestrians) is obtained using image processing. We implemented a prototype version of the proposed system to a real environment and it showed promising results for a running system covering a wide area.

A System Concept for 3D Human Flow Management Based on 3D Spatial Information

abstract A controller who is responsible for safety makes decisions concerning measures for visitor safety using a human-based decision-making process. Many potential accidents that could be caused by human error lurk in the process. These accidents can be reduced by changing from a human-based to technology based decision-making process. A technology-based decision-making process can draw a controller’s attention to trouble spots by data filtering, alarm filtering, and so on. The controller can thus obtain information on the occurrence of possible accidents proactively. The objective of this study is to suggest a system for 3D human flow management using a technology-based decision-making process. The system is divided into two parts: a 3D spatial information system and a human motion detection system. The former is built from 3D CAD and a geographic information system, and the latter is developed from image processing. This study shows the direction of system development and the method of application, and describes the contribution of the system.

A Method of Pedestrian Flow Speed Estimation Adaptive to Viewpoint Changes

This paper proposes a method to estimate the flow speed of pedestrians in surveillance videos. In the proposed method, the average moving speed of pedestrians is measured by estimating the size of real-world motion from the observed motion vectors. For this purpose, a pixel-to-meter conversion factor is introduced which is calculated from camera parameters. Also, the height information, which is missing because of camera projection, is predicted statistically from simulation experiments. Compared to the previous works for flow speed estimation, our method can be applied to various camera views because it separates scene parameters explicitly. Experiments are performed on both simulation image sequences and real video. In the experiments on simulation videos, the proposed method estimated the flow speed with average error of about 0.08m/s. The proposed method also showed promising results for the real video.