回転するビームスプリッタと合わせ鏡を用いた粒子運動の三次元計測法(機械力学,計測,自動制御)

概要

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The automatic inference of depth/distance information is a primary aim of computer vision systems. Though the stereovision method is often used for computer vision, finding matching pairs between frames can often be problematic, particularly when there are several possible choices of matching points. To address these problems, we have developed a depth measurement system that uses a single CCD camera. By setting the optical device in front of the camera lens, the image of a target recorded on the image plane is displaced by an amount related to the distance between the camera and the target. When the optical device is rotated physically at high speed during the exposure of the camera, the image of a moving target traces a spiral streak. Since the size of the streak is inversely proportional to the depth and the pitch and size variation of the spiral relates to the velocity of the moving target, the 3-D information of the target can be obtained by analyzing the streak. In order to make image processing easier, the spiral streaks and their corresponding center line are recorded on the same image. The center line helps in analyzing the streaks. This method has been applied to the measurement of moving tracer particles in flow and satisfactory results were obtained.
2008-11-25