Share Email Print
cover

Proceedings Paper

Method of capturing image of object passing through focus area
Author(s): Kengo Konnai; Yasushi Hoshino
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

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.

Paper Details

Date Published: 11 April 2001
PDF: 9 pages
Proc. SPIE 4308, High-Speed Imaging and Sequence Analysis III, (11 April 2001); doi: 10.1117/12.424995
Show Author Affiliations
Kengo Konnai, Nippon Institute of Technology (Japan)
Yasushi Hoshino, Nippon Institute of Technology (Japan)


Published in SPIE Proceedings Vol. 4308:
High-Speed Imaging and Sequence Analysis III
James S. Walton; Alan M. Frank, Editor(s)

© SPIE. Terms of Use
Back to Top