Out-of-focus blur models that have traditionally been used in image restoration are based on geometrical optics. Continuous-focus blurs based on the principles of diffraction optics are reviewed, and their discrete representation is discussed. Restorations are carried out by using both types of blur models for defocused images blurred in a CCD (charge-coupled-device) camera with pixel resolution equal to 6.8 mu . The differences between the restorations performed by using both types of PSF (point-spread-function) models are not significant. The accuracy of the representation of the PSF generated by using diffraction optics and the resulting restoration quality are linked to the pixel resolution.
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