| Project/Area Number |
07650517
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
計測・制御工学
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
NAKANISHI Tsunehiko Ritsumeikan University Faculty of Science & Engineering, Dept.of Electricity and Electronics, Professor, 理工学部, 教授 (40066725)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | traffic flow survey / traffic counter / vehicle width measurement / image processing / spatial frequency analysis / noncontact measurement / 空間周波数分析 / 空間周波数 / DSP |
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| Research Abstract |
There are many methods to measure the width of vehicles s, but it is difficult to measure the length of moving objects without stopping. So a noncontact measurement method is needed for the vehicle width measurement. This study deals with the simple system construction using a portable video camera and a personal computer, and surveys calculating method using Fourier Transformation to achieve noncontact measurement of vehicle width.
We consider that the brightness of a vehicle on the image differs from background. The general measurement method is to count the pixels count or edge of difference in the brightness between a vehicle image and the background image, but the accuracy of this method is not high enough. We make a spatial frequency spectrum of the image for scale of measurement, which corresponds to vehicle width, and we reanalyze the frequency analysis of the brightness spectrum. Then, we achieved width measurement of vehicles in the traffic flow.
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