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Proceedings Paper

Distortion improvement of capsule endoscope image
Author(s): Ou-Yang Mang; Shih-Wei Huang; Yung-Lin Chen; Chu-Hsun Lin; Tai-Yung Lin; Yi-Ting Kuo
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Paper Abstract

Distortion exists in the present capsule endoscope image resulting from the confined space and the wide-angle requirement [8]. Based on the previous two lens works, the optimal design had obtained that the field of view was about 86 degrees , and MTF was about 18% at 100 lp/mm, but distortion would go to -26%. It's difficult to add another lens on the 7mm optical path between the dome and imaging lenses for improving distortion. In order to overcome this problem, we intend to design the optical dome as another optical lens. The original dome is transparent and has an equal thickness, namely without refracting light almost. Our objective in this paper is to design the inner curvature of the dome and associate two aspheric imaging lenses in front of the CMOS sensors to advance the distortion with maintaining field of view and MTF under the same capsule volume. Furthermore, the paper proposes the real object plane of intestine is nearly a curved surface rather than an ideal flat surface. Taking those reasons under consideration, we design three imaging lenses with curved object plane and obtain the field of view is about 86 degrees , MTF is about 26% at 100 lp/mm, and the distortion improve to -7.5%. Adding the dome lens is not only to enhance the image quality, but also to maintain the tiny volume requirement.

Paper Details

Date Published: 6 February 2007
PDF: 9 pages
Proc. SPIE 6430, Advanced Biomedical and Clinical Diagnostic Systems V, 643018 (6 February 2007); doi: 10.1117/12.699742
Show Author Affiliations
Ou-Yang Mang, National Central Univ. (Taiwan)
Shih-Wei Huang, National Central Univ. (Taiwan)
Yung-Lin Chen, National Central Univ. (Taiwan)
Chu-Hsun Lin, National Central Univ. (Taiwan)
Tai-Yung Lin, Chung-Shan Institute of Science and Technology (Taiwan)
Yi-Ting Kuo, Jen-The 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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