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Image Deblurring using L0 Sparse and Directional Filters
Aparna Ashok, Deepa P. L.
Pages - 209 - 221     |    Revised - 30-06-2015     |    Published - 31-07-2015
Volume - 9   Issue - 4    |    Publication Date - July / August 2015  Table of Contents
Motion Blur, Blind Deconvolution, Deblurring, L0 Sparsity, Directional Filtering, Image Restoration.
Blind deconvolution refers to the process of recovering the original image from the blurred image when the blur kernel is unknown. This is an ill-posed problem which requires regularization to solve. The naive MAP approach for solving the blind deconvolution problem was found to favour no-blur solution which in turn led to its failure. It is noted that the success of the further developed successful MAP based deblurring methods is due to the intermediate steps in between, which produces an image containing only salient image structures. This intermediate image is essentially called the unnatural representation of the image. L0 sparse expression can be used as the regularization term to effectively develop an efficient optimization method that generates unnatural representation of an image for kernel estimation. Further, the standard deblurring methods are affected by the presence of image noise. A directional filter incorporated as an initial step to the deblurring process makes the method efficient to be used for blurry as well as noisy images. Directional filtering along with L0 sparse regularization gives a good kernel estimate in spite of the image being noisy. In the final image restoration step, a method to give a better result with lesser artifacts is incorporated. Experimental results show that the proposed method recovers a good quality image from a blurry and noisy image.
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Miss Aparna Ashok
Mar Baselios College of Engineering - India
Mr. Deepa P. L.
Mar Baselios College of Engineering - India

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