Method and apparatus for suppressing blocking artifacts in block

Details Method and apparatus for suppressing blocking artifacts in block Method and apparatus for suppressing blocking artifacts in block

1996-04-10

1998-04-07

Rogers, Scott A.

Image analysis

Image enhancement or restoration

Edge or contour enhancement

382239, 382250, 382261, 382264, 358433, 358430, G06T 500, G06T 900, H04N 1409, H04N 1415

Patent

active

057374511

ABSTRACT:
An improved method for removing blocking artifacts in regions of slowly varying intensity in an electronic image decoded from a transform coded representation of an image, includes the steps of: receiving signals indicative of DC and AC coefficient values of transformed blocks of image data; modifying the DC value in each of the blocks based on the level of activity within the block and the DC values in neighboring blocks; performing AC prediction in each block using the modified DC values; replacing the AC values in each block with the AC predicted values based on the level of activity within the block and the modified DC values in neighboring blocks; and reconstructing the image using the modified DC and AC coefficient values.

REFERENCES:
patent: 5495538 (1996-02-01), Fan
patent: 5590064 (1996-12-01), Astle
W.B. Pennebaker, J.L. Mitchell, JPEG, Still Image Data Compression Standard, 1993, pp. 261-265.

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