Multiple LEDs luminous system in capsule endoscope

Ou-Yang Mang; Shih-Wei Huang; Hsin-Hung Lee; Yung-Lin Chen; Ko-Chih Huang; Yi-Ting Kuo

doi:10.1117/12.699763

6 February 2007 Multiple LEDs luminous system in capsule endoscope

Ou-Yang Mang, Shih-Wei Huang, Hsin-Hung Lee, Yung-Lin Chen, Ko-Chih Huang, Yi-Ting Kuo

Proceedings Volume 6430, Advanced Biomedical and Clinical Diagnostic Systems V; 64300V (2007) https://doi.org/10.1117/12.699763
Event: SPIE BiOS, 2007, San Jose, California, United States

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.

Citation Download Citation

Ou-Yang Mang, Shih-Wei Huang, Hsin-Hung Lee, Yung-Lin Chen, Ko-Chih Huang, and Yi-Ting Kuo "Multiple LEDs luminous system in capsule endoscope", Proc. SPIE 6430, Advanced Biomedical and Clinical Diagnostic Systems V, 64300V (6 February 2007); https://doi.org/10.1117/12.699763

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