How to obtain knowledge about the degradation
There are three knowledge about the degradation
Estimation by Image observation
Estimation by Experimentation
Estimation by Modeling
Given a degraded image without knowledge about H, one way to estimate H is to gather information from the image itself
the effect of noise is negligible because of our choice of a strong-signal area
Restoration process estimation
This case used when we know only g(x,y) and cannot repeat experiment
Used when we have the same equipment set up and can repeat the experiment
Estimate the Degradation function
Estimation by Modeling
Degradation modeling is used for many years with Degradation modeling is used for many years with considerable success. There are several fundamental models for the degradation function
three typical degradation with a simple function:
-Motion blur(relative constant speed movement of the object with repect to the camera)
-Wrong lens focus
-Atmospheric turbulence