Enhancement of JPEG coded images by adaptive spatial filtering

Authors:
A. Kundu
Affiliations:
-
Venue:
ICIP '95 Proceedings of the 1995 International Conference on Image Processing (Vol. 1)-Volume 1 - Volume 1
Year:
1995

Citing 0
Cited 3

Enhancement of JPEG-Compressed Images by Re-application of JPEG

Journal of VLSI Signal Processing Systems - Special issue on multimedia signal processing
Artifact reduction of JPEG coded images using mean-removed classified vector quantization

Signal Processing
Investigating the relationship between image enhancement and image compression in the context of the multi-scale retinex

Journal of Visual Communication and Image Representation

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Abstract

The JPEG coder has proven to be extremely useful in coding image data. For low bit-rate image coding (0.75 bit or less per pixel), however, the block effect becomes very annoying. The edges also display 'wave-like' appearance. An enhancement algorithm is proposed to enhance the subjective quality of the reconstructed images. First, the pixels of the coded image are classified into three broad categories: (a) pixels belonging to quasi-constant regions where the pixel intensity values vary slowly, (b) pixels belonging to dominant-edge (DE) regions which are characterized by few sharp and dominant edges and (c) pixels belonging to textured regions which are characterized by many small edges and thin-line signals. An adaptive mixture of some well-known spatial filters which uses the pixel labeling information for its adaptation is used as the adaptive optimal spatial filter for image enhancement. Some experimental results are also provided to demonstrate the success of the proposed scheme.