On the accuracy of PSF representation in image restoration

Author

Savakis, Andreas E. ; Trussell, H. Joel

Author_Institution

Coll. of Eng. & Appl. Sci., Rochester Univ., NY, USA

Volume

2

Issue

2

fYear

1993

fDate

4/1/1993 12:00:00 AM

Firstpage

252

Lastpage

259

Abstract

Point spread function (PSF) models derived from physical optics provide a more accurate representation of real blurs than simpler models based on geometrical optics. However, the physical PSF models do not always result in a significantly better restoration, due to the coarse sampling of the recording device and insufficiently high signal-to-noise ratio (SNR) levels. Low recording resolutions result in aliasing errors in the PSF and suboptimal restorations. A high-resolution representation of the PSF where aliasing errors are minimized is used to obtain improved restorations. The SNR is the parameter which ultimately limits the restoration quality and determines the need for an accurate PSF model. As a rule of thumb, the geometrical PSF can be used in place of the physical PSF without significant loss in restoration quality when the SNR is less than 30 dB

Keywords

geometrical optics; image reconstruction; physical optics; PSF models; SNR; aliasing errors; geometrical optics; image quality; image restoration; physical optics; point spread function; recording device; restoration quality; signal-to-noise ratio; Geometrical optics; Image restoration; Image sampling; Optical recording; Physical optics; Signal resolution; Signal restoration; Signal to noise ratio; Solid modeling; Thumb;

fLanguage

English

Journal_Title

Image Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7149

Type

jour

DOI

10.1109/83.217229

Filename

217229