Defocus-invariant image registration for phase-difference detection auto focusing

Leonidas Spinoulas; Aggelos K. Katsaggelos; Jinbeum Jang; Yoonjong Yoo; Jaehyun Im; Joonki Paik

doi:10.1109/ISCE.2014.6884378

Defocus-invariant image registration for phase-difference detection auto focusing

Leonidas Spinoulas, Aggelos K. Katsaggelos, Jinbeum Jang, Yoonjong Yoo, Jaehyun Im, Joonki Paik

Electrical and Computer Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

5 Scopus citations

Abstract

This paper presents a defocus-invariant image registration method for measuring the shifting value between two differently located patterns in an imaging sensor. Existing registration methods fail with unfocused images since features or regions of interest are degraded by defocus. In order to solve this problem, the proposed method consists of three stages: i) pre-generation of the set of point spread functions (PSFs) estimated in different focusing positions, ii) the geometric transformation estimation using estimated PSF data, and iii) registration using estimated transformation matrix. The proposed method improves out-of-focus degradation through estimation of PSF. For this reason, the proposed method can accurately estimate the difference of phase between two out-of-focus images. Furthermore, it can be applied to phase-difference detection auto focusing, and provide accurate auto focusing performance.

Original language	English (US)
Title of host publication	ISCE 2014 - 18th IEEE International Symposium on Consumer Electronics
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Print)	9781479945924
DOIs	https://doi.org/10.1109/ISCE.2014.6884378
State	Published - 2014
Event	18th IEEE International Symposium on Consumer Electronics, ISCE 2014 - Jeju, Korea, Republic of Duration: Jun 22 2014 → Jun 25 2014

Publication series

Name	Proceedings of the International Symposium on Consumer Electronics, ISCE

Other

Other	18th IEEE International Symposium on Consumer Electronics, ISCE 2014
Country/Territory	Korea, Republic of
City	Jeju
Period	6/22/14 → 6/25/14

Keywords

constrained least square filter
elastic registration
floating values
phase difference detection auto focus

ASJC Scopus subject areas

General Engineering

Access to Document

10.1109/ISCE.2014.6884378

Cite this

Spinoulas, L., Katsaggelos, A. K., Jang, J., Yoo, Y., Im, J., & Paik, J. (2014). Defocus-invariant image registration for phase-difference detection auto focusing. In ISCE 2014 - 18th IEEE International Symposium on Consumer Electronics Article 6884378 (Proceedings of the International Symposium on Consumer Electronics, ISCE). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISCE.2014.6884378

@inproceedings{e5da598884e1490db1bd878a24e52282,

title = "Defocus-invariant image registration for phase-difference detection auto focusing",

abstract = "This paper presents a defocus-invariant image registration method for measuring the shifting value between two differently located patterns in an imaging sensor. Existing registration methods fail with unfocused images since features or regions of interest are degraded by defocus. In order to solve this problem, the proposed method consists of three stages: i) pre-generation of the set of point spread functions (PSFs) estimated in different focusing positions, ii) the geometric transformation estimation using estimated PSF data, and iii) registration using estimated transformation matrix. The proposed method improves out-of-focus degradation through estimation of PSF. For this reason, the proposed method can accurately estimate the difference of phase between two out-of-focus images. Furthermore, it can be applied to phase-difference detection auto focusing, and provide accurate auto focusing performance.",

keywords = "constrained least square filter, elastic registration, floating values, phase difference detection auto focus",

author = "Leonidas Spinoulas and Katsaggelos, {Aggelos K.} and Jinbeum Jang and Yoonjong Yoo and Jaehyun Im and Joonki Paik",

year = "2014",

doi = "10.1109/ISCE.2014.6884378",

language = "English (US)",

isbn = "9781479945924",

series = "Proceedings of the International Symposium on Consumer Electronics, ISCE",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

booktitle = "ISCE 2014 - 18th IEEE International Symposium on Consumer Electronics",

address = "United States",

note = "18th IEEE International Symposium on Consumer Electronics, ISCE 2014 ; Conference date: 22-06-2014 Through 25-06-2014",

}

Spinoulas, L, Katsaggelos, AK, Jang, J, Yoo, Y, Im, J & Paik, J 2014, Defocus-invariant image registration for phase-difference detection auto focusing. in ISCE 2014 - 18th IEEE International Symposium on Consumer Electronics., 6884378, Proceedings of the International Symposium on Consumer Electronics, ISCE, Institute of Electrical and Electronics Engineers Inc., 18th IEEE International Symposium on Consumer Electronics, ISCE 2014, Jeju, Korea, Republic of, 6/22/14. https://doi.org/10.1109/ISCE.2014.6884378

Defocus-invariant image registration for phase-difference detection auto focusing. / Spinoulas, Leonidas; Katsaggelos, Aggelos K.; Jang, Jinbeum et al.
ISCE 2014 - 18th IEEE International Symposium on Consumer Electronics. Institute of Electrical and Electronics Engineers Inc., 2014. 6884378 (Proceedings of the International Symposium on Consumer Electronics, ISCE).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Defocus-invariant image registration for phase-difference detection auto focusing

AU - Spinoulas, Leonidas

AU - Katsaggelos, Aggelos K.

AU - Jang, Jinbeum

AU - Yoo, Yoonjong

AU - Im, Jaehyun

AU - Paik, Joonki

PY - 2014

Y1 - 2014

N2 - This paper presents a defocus-invariant image registration method for measuring the shifting value between two differently located patterns in an imaging sensor. Existing registration methods fail with unfocused images since features or regions of interest are degraded by defocus. In order to solve this problem, the proposed method consists of three stages: i) pre-generation of the set of point spread functions (PSFs) estimated in different focusing positions, ii) the geometric transformation estimation using estimated PSF data, and iii) registration using estimated transformation matrix. The proposed method improves out-of-focus degradation through estimation of PSF. For this reason, the proposed method can accurately estimate the difference of phase between two out-of-focus images. Furthermore, it can be applied to phase-difference detection auto focusing, and provide accurate auto focusing performance.

AB - This paper presents a defocus-invariant image registration method for measuring the shifting value between two differently located patterns in an imaging sensor. Existing registration methods fail with unfocused images since features or regions of interest are degraded by defocus. In order to solve this problem, the proposed method consists of three stages: i) pre-generation of the set of point spread functions (PSFs) estimated in different focusing positions, ii) the geometric transformation estimation using estimated PSF data, and iii) registration using estimated transformation matrix. The proposed method improves out-of-focus degradation through estimation of PSF. For this reason, the proposed method can accurately estimate the difference of phase between two out-of-focus images. Furthermore, it can be applied to phase-difference detection auto focusing, and provide accurate auto focusing performance.

KW - constrained least square filter

KW - elastic registration

KW - floating values

KW - phase difference detection auto focus

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Spinoulas L, Katsaggelos AK, Jang J, Yoo Y, Im J, Paik J. Defocus-invariant image registration for phase-difference detection auto focusing. In ISCE 2014 - 18th IEEE International Symposium on Consumer Electronics. Institute of Electrical and Electronics Engineers Inc. 2014. 6884378. (Proceedings of the International Symposium on Consumer Electronics, ISCE). doi: 10.1109/ISCE.2014.6884378

Defocus-invariant image registration for phase-difference detection auto focusing

Abstract

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Keywords

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