Estimation of out-of-focus blur and its effectiveness for deblurring

Naoki Saitoh; Kenro Kuroki; Kenji Kurosawa

doi:10.1117/12.267165

19 February 1997 Estimation of out-of-focus blur and its effectiveness for deblurring

Naoki Saitoh, Kenro Kuroki, Kenji Kurosawa

Proceedings Volume 2942, Investigative Image Processing; (1997) https://doi.org/10.1117/12.267165
Event: Enabling Technologies for Law Enforcement and Security, 1996, Boston, MA, United States

Abstract

We have studied the use of point spread function (PSF) calculated by the wave optics for restoration of out-of- focused images. According to the theory, PSF and its Fourier transform OTF depend only on the defocus quantity (Delta) which can be calculated by using physical quantities of a lens. It is recognized that large objects in out-of-focused images can be restored well by using calculated PSF or OTF when a diaphragm is circular and (Delta) is estimated adequately. However details can not be restored well especially when (Delta) is large. Difference is recognized between PSF based on the geometrical optics and PSF based on the wave optics. It is recognized that images obtained by using PSF calculated by the wave optics are better in sharpness than by using PSF calculated by the geometrical optics. Such difference becomes larger as (Delta) becomes smaller. In the case that the diaphragm differs from a circular disc such as home video cameras, it is important to take the diaphragm form into account.

Citation Download Citation

Naoki Saitoh, Kenro Kuroki, and Kenji Kurosawa "Estimation of out-of-focus blur and its effectiveness for deblurring", Proc. SPIE 2942, Investigative Image Processing, (19 February 1997); https://doi.org/10.1117/12.267165

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Point spread functions

Image restoration

Optical transfer functions

Geometrical optics

Cameras

Fourier transforms

Video

Show All Keywords

Keywords/Phrases

Search In:

Publication Years