| 摘要 |
An on-vehicle object detector has both a relative position measuring device and an image-taking device. The relative position measuring device is for scanning a frontal area with a beam of electromagnetic waves and measures distance L 1 and direction to an object that reflects the waves. The image-taking device is for obtaining an image above a traffic lane in front and measures distance L 2 to an object detected on this image. The vertical angle of spread of the electromagnetic beam is reduced if it is indicated by these devices that there is an object for which |L 1 -L 2 | satisfies a specified condition, indicating that there is an overhead road sign which is likely to affect the accuracy of measurement.
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