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11 April 2001 Method of capturing image of object passing through focus area
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Proceedings Volume 4308, High-Speed Imaging and Sequence Analysis III; (2001)
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States
We studied the method of capturing the image of the object that passes through certain area. The focus area of CCD image capturing system is adjusted to the certain area. DCT (Discrete Cosine Transformation) is performed on the captured images and the best-focused image is selected by monitoring the high frequency ration of DCT. In general, when the image becomes sharp, the high frequency component of DCT increases. When the object such as a man or goods moves through a focus area, the image on CCD sensor will turn into a sharp image from a blur image, and then will turn to a blur image. Therefore, we judged the object is in a focus area by monitoring a serial change of the high frequency DCT ratio of an image, because the ration shows the maximum at the sharpest image. It is confirmed that detection of object in a focus area is possible. This results means that the image capturing system can be realized only with a camera and a processor without other sensor such as a position sensor. The method will be applied to the field of security, manufacturing line and so on.
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Kengo Konnai and Yasushi Hoshino "Method of capturing image of object passing through focus area", Proc. SPIE 4308, High-Speed Imaging and Sequence Analysis III, (11 April 2001);

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