Measurement of Vehicle Width by Analyzing Spectrum Envelope of Image

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  • 画像のスペクトルエンベロープ分析による車両巾計測
  • ガゾウ ノ スペクトル エンベロープ ブンセキ ニヨル シャリョウ ハバケイソ

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Abstract

This paper deals with a noncontact method to measure the width of vehicles by image processing.<br>There are many methods to measure the length of objects, 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 paper reports the simple system construction using a portable camera and a personal computer, and reports calculating method using Fourier Transformation to achieve noncontact measurement of vehicle width.<br>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 are able to obtain the vehicle width.<br>In this paper, we show the usefulness of this method for the width measurement of vehicles in the traffic flow.

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