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Proceedings Paper

On-line inspection system of surface quality for medical film
Author(s): Wei Lu; Hui-min Yan; Wen Qiao
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Paper Abstract

This paper presents an on-line inspection instrument of surface quality for medical film. Using LED light to illumine moving medical film from one side, in the other side LED transmitted light is focused on linear CCD of 2048 pixels. With CCD, optical information is converted into electrical information which is fast processed by a hybrid circuit to get the size and position of the tiny smudge. An adaptive threshold method is invented in the circuit to extract exactly the information of different kinds of tiny smudges. This instrument has already been proved to be of high stability with better spatial resolution than 1mmx1mm in the condition of an inspection range of 1.4m and a film moving speed of 2m/s. Besides, a further all-digital processing method for increasing inspection resolution and distinguishing tiny smudges and normal crystals on e medical film is also put forward.

Paper Details

Date Published: 19 November 2007
PDF: 4 pages
Proc. SPIE 6724, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems, 67240H (19 November 2007); doi: 10.1117/12.782512
Show Author Affiliations
Wei Lu, Zhejiang Univ. (China)
Hui-min Yan, Zhejiang Univ. (China)
Wen Qiao, Zhejiang Univ. (China)


Published in SPIE Proceedings Vol. 6724:
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems
Sen Han; Tingwen Xing; Yanqiu Li; Zheng Cui, Editor(s)

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