2.11 Image restoration basics

Image restoration

In many applications ( e.g. , satellite imaging, medical imaging, astronomical imaging, poor-qualityfamily portraits) the imaging system introduces a slight distortion. Often images are slightly blurred and imagerestoration aims at deblurring the image.

The blurring can usually be modeled as an LSI system with a given PSF $h(m, n)$ .

The observed image is

Frequency domain analysis

looks at the original images in its typical form; however, it is often useful tolook at our images and PSF in the frequency domain. In , we take another look at the image blurring example above and look at how the imagesand results would appear in the frequency domain if we applied the fourier transforms.