On the accuracy of PSF representation in image restoration
Open Access
- 1 April 1993
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Image Processing
- Vol. 2 (2) , 252-259
- https://doi.org/10.1109/83.217229
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 dBKeywords
This publication has 7 references indexed in Scilit:
- Restorations of real defocused images using blur models based on geometrical and diffraction opticsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Blur identification using the bispectrumIEEE Transactions on Signal Processing, 1991
- Blur identification by statistical analysisPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1991
- On modeling the focus blur in image restorationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1991
- Review of image-blur models in a photographic system using the principles of opticsOptical Engineering, 1990
- Determination of optical transfer function by inspection of frequency-domain plotJournal of the Optical Society of America, 1973
- Properties of a Defocused Optical System*Journal of the Optical Society of America, 1969