Robust Focusing using Orientation Code Matching
Li, Yuan (Hokkaido University (Sapporo, Japó). Graduate School of Information Science and Technology)
Takauji, Hidenori (Hokkaido University (Sapporo, Japó). Graduate School of Information Science and Technology)
Kaneko, Shun'ichi (Hokkaido University (Sapporo, Japó). Graduate School of Information Science and Technology)
Tanaka, Takayuki (Hokkaido University (Sapporo, Japó). Graduate School of Information Science and Technology)
Ohmura, Isao (Hokkaido Industrial Research Institute (Sapporo, Japó))

Data:	2008
Resum:	This paper proposes a novel scheme for image focusing by introducing a new focus measure based on self-matching methods. A unique pencil-shaped profile is identified by comparing the similarity between all patterns extracted around the same position in each scene. Based on this profile, a new criterion function called Complementary Pencil Volume (hereafter CPV) is defined to evaluate focused or defocused scenes based on similarity rate of self-matching, which visually represents the volume of a pencil-shaped profile. Among matching methods, Orientation Code Matching (hereafter OCM) is recommended due to its invariance with regards to illumination and contrasts. Several experiments using a telecentric lens are implemented to demonstrate the efficiency of proposed measures. Outstandingly, comparing Orientation Code Matching-based (hereafter OCM-based) focus measure with conventional focus measures shows that OCM-based focus measure is robust against changes of illuminations and contrast. Using this method, depth is measured by comparing the focused and defocused region in the scenes both under high and low illumination conditions.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Robustesa ; Centrar ; Codi d'orientació Matching ; Volum complementari de Llapis ; Mesura de la profunditat ; Robustez ; Centrarse ; Código de orientación Matching ; Volumen complementario de Lápiz ; Medida de la profundidad ; Robustness ; Focusing ; Orientation Code Matching ; Complementary Pencil Volume ; Ill-conditioning ; Depth Measurement
Publicat a:	ELCVIA : Electronic Letters on Computer Vision and Image Analysis, V. 7 n. 3 (2008) p. 101-114, ISSN 1577-5097

Adreça original: https://elcvia.cvc.uab.es/article/view/v7-n3-li-ohmura-takauji-et-al
Adreça alternativa: https://raco.cat/index.php/ELCVIA/article/view/150403
DOI: 10.5565/rev/elcvia.184

14 p, 1.6 MB

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