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Digital Image Restoration Algorithm

Author: MengJun
Tutor: LiuYue
School: Guizhou University
Course: Power Electronics and Power Drives
Keywords: Digital Image Processing Image Degradation Image Filtering Image Restoration
CLC: TP391.41
Type: Master's thesis
Year: 2006
Downloads: 790
Quote: 3
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Abstract


There are a lot of factors such as the phase difference of the optical system, the atmosphere turbulence, moving and the system noise that degrade the digital images during their obtaining . The destination of image restoration is to recover image that has been degraded and make sure that the processed image as near as possible to the original image. In general ,in order to recovering the degraded image we resort to filtering of image. In filtering of image , both demising and maintaining of the detail about the image is required. But in most cases demising of image conflicts with maintaining of detail in restoration processing .For the reason that mentioned above restoration of image is very challenge as a issue of digital image processing full of importance. Many problems attached to this specific issue call for better solutions that have not been provided at present.In this paper, several algorithms dealing with restoration of digital image are proposed and discussed based on some basic classic approach .By some improvement and combination operations these new algorithms can do better than some basic classic approach in work.In introduction to this paper, an overview of some advances in restoration of digital image is recounted at first, then the construction and the organization of this paper are listed.Chapter two touches on some basic concepts in relation to digital image processing especially restoration of digital image. These concepts including the area of digital image processing .A/D and quantization of analogue image, mathematical model of noise and some parameters about estimation of objective effect of restoration result of digital image as well.Chapter three mainly deals with image restoration in the spatial domain .At first, a model of image degradation and restoration is presented. In the followed part, some basic classic noise-reduction spatial filters are discussed briefly. In the last part, two filters are discussed in detail. The first is an adaptive filter used in situation of blended noise. The second is an all-direction-element-based weighted average filter.Chapter four is concerned mainly with digital image restoration method in transform domain, This chapter is divided into two self-contained sections oriented to filters based on Fourier transform and filters based on wavelet transform respectively. Inspired by the common minimum mean square error(Wiener) filtering and the constrained least squares filtering, a recursive blind recovery filter is derived in Fourier transform domain. Two other

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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