Translator Disclaimer
Paper
19 February 1997 Estimation of out-of-focus blur and its effectiveness for deblurring
Author Affiliations +
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.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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
PROCEEDINGS
8 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

Fast PSF estimation under anisoplanatic conditions
Proceedings of SPIE (October 08 2015)
New method for focused image recovery from image defocus
Proceedings of SPIE (October 30 1997)
Restoration of images degraded by mechanical vibrations
Proceedings of SPIE (July 05 1994)
Motion blur removal based on restoration error analysis
Proceedings of SPIE (March 01 2005)
Restoration of images degraded by motion
Proceedings of SPIE (October 01 1992)

Back to Top