System and method for enhancement of coded images using adaptive

Details System and method for enhancement of coded images using adaptive System and method for enhancement of coded images using adaptive

1995-11-22

1998-09-22

Boureau, Leo H.

Image analysis

Image enhancement or restoration

Image filter

382261, 382235, G06K 936, G06K 940, G06K 946

Patent

active

058127020

ABSTRACT:
Pixels in a low bit-rate encoded image are categorized into two or more categories. In one embodiment three pixel categories are used: 1) pixels belonging to quasi-constant (QC) regions where the pixel intensity values vary slowly (e.g., pictorial portions), 2) pixels belonging to textured regions which are characterized by many small edges and thin-line signals (e.g., text portions), and 3) pixels belonging to dominant-edge (DE) regions which are characterized by few sharp and dominant edges (e.g., edge portions). In one embodiment DE pixels are categorized first, then QC and textural pixels are distinguished from the remaining pixels using the number of zero-crossings among the pixels and a threshold. Conventional spatial filters that are well suited for each pixel category type are then used to enhance each region of the image. In one embodiment, various combinations of spatial filters are used to enhance the image.

REFERENCES:
patent: 5218649 (1993-06-01), Kundu et al.
patent: 5327509 (1994-07-01), Rich
"Digital Step Edges from Zero Crossing of Second Directional Derivatives, Robert M. Haralick, IEEE, 1984".
Liu et al "Adaptive Post-Processing Algorithms for Low Bit Rate Video Signals", IEEE, Apr. 1994.

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