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Proceedings Paper

Multiple LEDs luminous system in capsule endoscope
Author(s): Ou-Yang Mang; Shih-Wei Huang; Hsin-Hung Lee; Yung-Lin Chen; Ko-Chih Huang; Yi-Ting Kuo
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Paper Abstract

Developing the luminous system in a capsule endoscope, it is difficult to obtain an uniform illumination[1] on the observed object because of several reasons: the light pattern of LED is sensitively depend on the driving current, location and projective angles; the optical path of LED light source is not parallel to the optical axis of the nearby imaging lenses; the strong reflection from the inner surface of the dome may saturate the CMOS sensors; the object plane of the observed intestine is not flat. Those reasons induce the over-blooming and deep-dark contrast in a picture and distort the original image strongly. The purpose of the article is to construct a photometric model to analyze the LED projection light pattern, and, furthermore, design a novel multiple LEDs luminous system for obtaining an uniform-brightness image. Several key parameters resulting as illumination uniformity has been taken under the model consideration and proven by experimental results. Those parameters include LED light pattern accuracy, choosing LED position relative to the imaging optical axis, LED numbers, arrangement, and the inner curvature of the dome. The novel structure improves the uniformity from 41% to 71% and reduces the light energy loss under 2%. The progress will help medical professionals to diagnose diseases and give treatment precisely based on the vivid image.

Paper Details

Date Published: 6 February 2007
PDF: 14 pages
Proc. SPIE 6430, Advanced Biomedical and Clinical Diagnostic Systems V, 64300V (6 February 2007); doi: 10.1117/12.699763
Show Author Affiliations
Ou-Yang Mang, National Central Univ. (Taiwan)
Shih-Wei Huang, National Central Univ. (Taiwan)
Hsin-Hung Lee, National Central Univ. (Taiwan)
Yung-Lin Chen, National Central Univ. (Taiwan)
Ko-Chih Huang, Chung-Shan Institute of Science & Technology (Taiwan)
Yi-Ting Kuo, Jen-The Junior College of Medicine (Taiwan)

Published in SPIE Proceedings Vol. 6430:
Advanced Biomedical and Clinical Diagnostic Systems V
Ramesh Raghavachari; Tuan Vo-Dinh; Warren S. Grundfest M.D.; David A. Benaron M.D.; Gerald E. Cohn, Editor(s)

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