Why Worry About Low Quality Images?

The image analyst, security officer or other image user often doesn’t control the production of images but rather must use what is provided.
 A video of fans at a stadium may produce tiny face images. A person approaching an entrance to a secure facility in a car may have his face distorted by a dirty window, falling snow and blurred by motion. A photo of a particular person may contain many other people who are in the background and out of focus. In a crowd scene, a person in front may partially block the person behind leading to an obscured face image.
 The quality of imagery is sometimes distorted on purpose to, for example, reduce transmission time or detectability on a wireless link, or to hide characteristics of an acquistion sensor

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