Image Restoration of JPEG Encoded Images via Block Matching and Wiener Filtering

Yutaka TAKAGI  Takanori FUJISAWA  Masaaki IKEHARA  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E100-A   No.9   pp.1993-2000
Publication Date: 2017/09/01
Online ISSN: 1745-1337
Type of Manuscript: PAPER
Category: Image
Keyword: 
JPEG,  signification,  block noise,  wiener filter,  block matching,  discrete cosine transform,  RGB color space,  YCbCR color space,  minimization problem,  

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Summary: 
In this paper, we propose a method for removing block noise which appears in JPEG (Joint Photographic Experts Group) encoded images. We iteratively perform the 3D wiener filtering and correction of the coefficients. In the wiener filtering, we perform the block matching for each patch in order to get the patches which have high similarities to the reference patch. After wiener filtering, the collected patches are returned to the places where they were and aggregated. We compare the performance of the proposed method to some conventional methods, and show that the proposed method has an excellent performance.