Image Restoration Using Multiple Thresholds Matlab Project with Source Code

ABSTRACT

               Image restoration is an art to improve the quality of image via estimating the amount of noises and blur involved in the image. With the passage of time, image gets degraded due to different atmospheric and environmental conditions, so it is required to restore the original image using different image processing algorithms. Application area varies from restoration of old images in museum and radar based image acquisition and restoration. Image restoration is based on the attempt to improve the quality of an image through knowledge of the physical process which led to its formation. The purpose of image restoration is to "compensate for" or "undo" defects which degrade an image. Degradation comes in many forms such as motion blur, noise, and camera mis-focus. In cases like motion blur, it is possible to come up with a very good estimate of the actual blurring function and "undo" the blur to restore the original image. In cases where the image is corrupted by noise, the best we may hope to do is to compensate for the degradation it caused. Image restoration differs from image enhancement in that the latter is concerned more with accentuation or extraction of image features rather than restoration of degradation's. 

               Restoration tries to reconstruct by using a priori knowledge of the degradation phenomenon. It deals with getting an optimal estimate of the desired result. Some restoration techniques are best achieved in the spatial domain, while there are some cases where frequency domain techniques are better suited The Purpose of smoothing is to reduce noise and improve the visual quality of the image. A variety of algorithms i.e. linear and nonlinear algorithms are used for filtering the images. Image filtering makes possible several useful tasks in image processing. A filtering technique can be applied to reduce the amount of unwanted noise in a particular image Another type of filter can be used to reverse the effects of blurring on a particular picture. Nonlinear filters have quite different behaviour as compared to linear filters. For nonlinear filters, the output or response of the filter does not follow the principles outlined earlier, particularly scaling and shift invariance. Moreover, a nonlinear filter can generate output that varies in a non-intuitive manner.

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