# Image Restoration-Theory and Methods

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What is image restoration in digital image processing?

Digital images are used to display or record useful information. But there are occasions when the produced images represent a degraded image apart from the original version. It is mainly due to imperfections in the image capturing process.

The undoing of these flaws are critical to most of the succeeding image processing works. There exists a broad variety of diverse degradations including instance noise, illumination, geometrical degradations and color imperfections.  In digital image processing, image restoration refers to a line of methods to reduce this degradation. The image degradation may happen:

• During the display mode
• Acquisition mode
• Due to sensor noise
• During processing mode
• Blur that result from camera focus issue
• Random turbulence of the atmosphere
• Object-camera motion problems

## Image Restoration

Most of the existing image restoration methods we begin with an assumption that the degradation procedure can be defined using a mathematical model. The success of this model depends on how deeply we are aware of the original image characteristics and the level of degradation that happened to the image under consideration.

What is the difference between image enhancement and restoration? Image enhancement is related to extraction or accentuation of the image features whereas image restoration deals with degradation elements associated with an image.

An imaging system consists of an image formation system, recorder and a detector. We can outline such a system using a general model which can be defined as:

Y(i,j)=r[w(i,j)]+n(i,j)

A basic version for the picture restoration process model is:Y(i,j)=H[f(i,j)]+n(i,j)

Where y(i, j) represents the degraded image, f (i, j) the original image, n(i,j) is the image independent external noise and H is an operator that represents the image degradation process. The image restoration methods can be classified as:

• Stochastic
• Deterministic
• Blind
• Non-blind
• Semi-blind

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Jesna is an assistant professor, digital marketing strategist and professional blogger who stumbled upon writing online since 2009. She started her blogging career in 2010, and never looked back. Since then, she has developed an incredible passion for writing about all sorts of tech. Away from blogosphere, she loves to paint and is the founder of fineartblogger.com