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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

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.

Original languageEnglish
Title of host publicationImaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues VI
DOIs
StatePublished - 1 Dec 2008
EventImaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues VI - San Jose, CA, United States
Duration: 21 Jan 200823 Jan 2008

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume6859
ISSN (Print)1605-7422

Conference

ConferenceImaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues VI
CountryUnited States
CitySan Jose, CA
Period21/01/0823/01/08

Keywords

  • capsule endoscope
  • curve object surface
  • depth of field

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