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Proceedings Paper

Matching-based focusing by orientation code matching and depth reconstruction
Author(s): Yuan Li; Hidenori Takauji; Shun'ichi Kaneko; Takayuki Tanaka; Isao Ohmura
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Paper Abstract

This paper has proposed a novel and robust scheme of image focusing by introducing a new measure of focusing based on Orientation Code Matching.(hereinafter,OCM) A unique pencil-shape profile has been found through comparing the similarity between any patterns extracted at the same position within their own scenes. Based on this profile, a new evaluation function, named Complemental Pencil Volume, (hereinafter, CPV), is defined and calculated to represent local sharpness of images, either in or out of focus. Then through a designed local-scope searching algorithm, the maximum of CPV, which corresponds to the just focused image, is searching in this schema. The proposed method of focusing can be applied to cases of ill-condition with low contrast observations. Experiment results show that the OCM-based focusing is very robust to change of brightness and even more irregularities in the real imaging system, like dark condition and so on.

Paper Details

Date Published: 8 October 2007
PDF: 9 pages
Proc. SPIE 6718, Optomechatronic Computer-Vision Systems II, 671802 (8 October 2007); doi: 10.1117/12.754537
Show Author Affiliations
Yuan Li, Hokkaido Univ. (Japan)
Hidenori Takauji, Hokkaido Univ. (Japan)
Shun'ichi Kaneko, Hokkaido Univ. (Japan)
Takayuki Tanaka, Hokkaido Univ. (Japan)
Isao Ohmura, Hikkaido Industrial Research Institute (Japan)

Published in SPIE Proceedings Vol. 6718:
Optomechatronic Computer-Vision Systems II
Jonathan Kofman; Yuri Lopez de Meneses; Shun'ichi Kaneko; Claudio A. Perez; Didier Coquin, Editor(s)

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