Optimizing the depth of field for short object distance of capsule endoscope

Yang-Mang Ou*, Shih Wei Huang, Wei Kai Su, Han Ming Feng, Zhao Yu Chen, Hsien Ming Wu, Yi Ting Kuo

*Corresponding author for this work

研究成果: Conference contribution同行評審

4 引文 斯高帕斯(Scopus)

摘要

Research of depth of field (DOF) for capsule endoscope is important for the reason that the shapes of the object plane of the intestine or the stomach are curve surfaces of "<" shape or "c" shape. The depth of field is dependent on following factors: focal length, circle of confusion, aperture, and subject distance. The first three factors are improved for wide view angle in prior paper and determined by the chosen sensor, and it is not going against depth of field. Last factor, subject distance, is the more freedom to enlarge the depth of field. However, depth of field is the range between near depth of field limit and far depth of field limit that are acceptably sharp. The fraction of the depth of field behind the focus is always large then the one in front of the focus distance. The depth of field does change with object distance, and it is increasing as object distance is increasing. But the object distance of the design for capsule endoscope is short. The object distance setting in front of the dorm is more efficient to use the depth of field than the one setting at the dome top. Therefore there is an appropriate design of object distance to make depth of field be used efficiently to inspect curve surface of intestine and stomach. The more vision information of inspect digestive system is get and is compared easily to diagnose patients' condition under wide and efficient range of depth of field.

原文English
主出版物標題Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues VI
DOIs
出版狀態Published - 1 十二月 2008
事件Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues VI - San Jose, CA, United States
持續時間: 21 一月 200823 一月 2008

出版系列

名字Progress in Biomedical Optics and Imaging - Proceedings of SPIE
6859
ISSN(列印)1605-7422

Conference

ConferenceImaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues VI
國家United States
城市San Jose, CA
期間21/01/0823/01/08

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