Research Papers: General

Color calibration of swine gastrointestinal tract images acquired by radial imaging capsule endoscope

[+] Author Affiliations
Mang Ou-Yang

National Chiao-Tung University, Department of Electrical and Computer Engineering, 1001 University Road, Hsinchu City 30010, Taiwan

Wei-De Jeng

National Chiao-Tung University, Institute of Electrical Control Engineering, 1001 University Road, Hsinchu City 30010, Taiwan

Chien-Cheng Lai

LIYO-Machinery Company Limited, 39 Guangqi Road, Taichung City 42949, Taiwan

Hsien-Ming Wu

Chung-Shan Institute of Science & Technology, 481 Zhongzheng Road, Taoyuan City 32546, Taiwan

Jyh-Hung Lin

Animal Technology Institute Taiwan, Division of Biotechnology, 52 Kedung Road, Miaoli City 35053, Taiwan

J. Biomed. Opt. 21(1), 015010 (Jan 22, 2016). doi:10.1117/1.JBO.21.1.015010
History: Received April 3, 2015; Accepted December 30, 2015
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Abstract.  The type of illumination systems and color filters used typically generate varying levels of color difference in capsule endoscopes, which influence medical diagnoses. In order to calibrate the color difference caused by the optical system, this study applied a radial imaging capsule endoscope (RICE) to photograph standard color charts, which were then employed to calculate the color gamut of RICE. Color gamut was also measured using a spectrometer in order to get a high-precision color information, and the results obtained using both methods were compared. Subsequently, color-correction methods, namely polynomial transform and conformal mapping, were used to improve the color difference. Before color calibration, the color difference value caused by the influences of optical systems in RICE was 21.45±1.09. Through the proposed polynomial transformation, the color difference could be reduced effectively to 1.53±0.07. Compared to another proposed conformal mapping, the color difference value was substantially reduced to 1.32±0.11, and the color difference is imperceptible for human eye because it is <1.5. Then, real-time color correction was achieved using this algorithm combined with a field-programmable gate array, and the results of the color correction can be viewed from real-time images.

© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Mang Ou-Yang ; Wei-De Jeng ; Chien-Cheng Lai ; Hsien-Ming Wu and Jyh-Hung Lin
"Color calibration of swine gastrointestinal tract images acquired by radial imaging capsule endoscope", J. Biomed. Opt. 21(1), 015010 (Jan 22, 2016). ; http://dx.doi.org/10.1117/1.JBO.21.1.015010


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