| 摘要 |
PURPOSE:To make it possible to simply and easily measure the distance up to a body to be measured by one image pickup means, by mounting a camera to the other end part of a rotary arm rotating around one end part thereof and calculating the distance from one end part of the arm to the body to be measured on the basis of movement quantity from a center line by an operation means. CONSTITUTION:An arm 3 is rotated so that the image of a body to be measured moves from such a state that said image is positioned on the center line in a vertical direction passing the center of the picture of a TV camera 4 to the lateral direction of the picture and the movement quantity from the center line of the image due to the rotation of the arm 3 is calculated to calculate the distance up to the body to be measured. That is, the arm 3 is set so that the camera 4 is positioned at the intersecting point P1 of a circle C and the straight line OT connecting points O, T and the image of the body 5 to be measured and held to such a state that the image of the body 5 to be measured is positioned at the center of the light receiving surface being the picture of the camera 4. When the arm 3 is rotated by a minute angle DELTAtheta from this state and the camera 4 is moved to the point P2 on the circle C, the body 5 to be measured relatively moves to a direction shifted by the angle alpha, which is formed by the optical axis of the camera 4, that is, the straight line OP2 connecting points O, P2 and the straight line P2T connecting points P2, T, with respect to the optical axis of said camera, that is, said straight line OP2. Therefore, the angle alpha is calculated from the picked-up image by the camera 4 to easily calculate a distance D.
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