Adaptive postprocessing system for reducing blocking effects and

Details Adaptive postprocessing system for reducing blocking effects and Adaptive postprocessing system for reducing blocking effects and

1996-10-09

1999-03-16

Moore, David K.

Image analysis

Image enhancement or restoration

Edge or contour enhancement

382270, G01S 1386

Patent

active

058839836

ABSTRACT:
An adaptive signal filtering method is provided to reduce blocking effects caused by decompression the block-based compressed images. The method includes the steps of generating binary edge map information by globally thresholding and locally thresholding the decompressed image; determining whether the binary edge map information within a filter window corresponding to respective pixels corresponds to a homogeneous area or an edge area, by using the binary edge map information corresponding to the filter window; generating a filtered pixel value corresponding to a respective pixel using the filter window which has a predetermined first weight factors for the homogeneous area when the binary edge map information is determined to be a homogeneous area in the determining step; adapting a predetermined second weight factors according to binary edge map information included in the filter window when the binary edge map information determined as an edge area in the second step; and generating a filtered pixel value for the respective pixel, using the filter window which has adapted second weight factors in said adapting step.

REFERENCES:
patent: 5268967 (1993-12-01), Jang et al.
patent: 5341142 (1994-08-01), Reis et al.
patent: 5359676 (1994-10-01), Fan
patent: 5539842 (1996-07-01), Schwartz

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