Post-processing method and apparatus for removing a blocking eff

Details Post-processing method and apparatus for removing a blocking eff Post-processing method and apparatus for removing a blocking eff

1995-05-01

1997-12-02

Johns, Andrew

Image analysis

Image enhancement or restoration

Image filter

382268, G06K 936

Patent

active

056944926

ABSTRACT:
A post-processing method and apparatus is capable of improving the image quality of a decoded image signal by effectively reducing or removing a blocking effect in the decoded image signal. Decoded image data is first stored in a memory and target pixel data is filtered. Thereafter, an absolute difference value between original target pixel data and the filtered target pixel data is calculated and compared with a predetermined threshold value. The stored target pixel data is updated with the filtered target pixel data if the absolute difference value is smaller than the predetermined threshold value and is updated with compensated target pixel data if otherwise, wherein the compensated target pixel data is provided by adding the original target pixel data and the predetermined threshold value if the original target pixel data is smaller than the filtered target pixel data and by subtracting the predetermined threshold value from the original target pixel data if the original target pixel data is greater than the filtered target pixel data. The filtering process is repeated up to N times as long as the absolute difference value is smaller than the predetermined threshold value.

REFERENCES:
patent: 5384849 (1995-01-01), Jeong
patent: 5454051 (1995-09-01), Smith
patent: 5495538 (1996-02-01), Fan

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