Loop filter and loop filtering method

Details Loop filter and loop filtering method Loop filter and loop filtering method

1997-07-14

1999-10-26

Rogers, Scott

Image analysis

Image enhancement or restoration

Edge or contour enhancement

382199, 382205, G06K 940, G06K 946

Patent

active

059741970

ABSTRACT:
A loop filtering method and a loop filter therefor are provided. The loop filtering method includes the steps of: (a) generating a binary edge map by comparing a value obtained by operating each pixel of the image data using a predetermined one-dimensional gradient operator with a predetermined threshold value; (b) applying a filter window with a predetermined size to the generated binary edge map to check whether an edge information exists within the filter window; (c) filtering the pixel value of the corresponding filter window by a pixel using predetermined first weights to generate a new pixel value if it is determined in the step (b) that the edge information does not exist; and (d) filtering the pixel value of the corresponding filter window by a pixel using predetermined second weights to generate a new pixel value if it is determined in the step (b) that the edge information exists, wherein the filtering is not performed in the step (d) if the pixel at the center of the filter window is edge information. Therefore, blocking effect and ringing noise are removed from the image passed through block-based compression restoration, improving the quality of the restored image.

REFERENCES:
patent: 5784499 (1998-07-01), Kuwahara
patent: 5784500 (1998-07-01), Homma
patent: 5796875 (1998-08-01), Read
patent: 5812702 (1998-09-01), Kundu
patent: 5818964 (1998-10-01), Itoh

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