Device for regenerating a picture signal by decoding

Details Device for regenerating a picture signal by decoding Device for regenerating a picture signal by decoding

1991-04-09

1993-07-20

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358426, 358432, H04N 140

Patent

active

052298647

ABSTRACT:
A device for decoding digital picture data coded by compression to thereby regenerate original picture data has a decoding section for decoding the digital picture data. A reverse normalizing section reversely normalizes picture data outputted by the decoding section. A reverse orthogonal transforming section executes two-dimensional reverse orthogonal transform with picture data outputted by the reverse normalizing section. A data counting section counts coded data existing in a plurality of blocks constituting the digital picture data block by block. A filter selecting section selects an interblock filter and an edge filter on the basis of the amount of coded data determined by the data counting section block by block. A correcting section corrects a distortion between nearby blocks by using the interblock filter selected, while an edge enhancing section executes edge enhancement by using the edge filter. The filter selecting section selects the intensity of the interblock filter and the intensity of the edge filter on the basis of the amount of coded data determined block by block. The filters for the correction of a distortion may be replaced with predicted values which are determined on the basis of the activities of individual blocks and substituted for pixel data. Random noise matching the activities of individual blocks may be added to pixel data after the correction in order to eliminate the distortion of contours of the blocks.

REFERENCES:
patent: 4774587 (1988-09-01), Schmitt
patent: 5051840 (1991-09-01), Watanabe et al.
patent: 5101280 (1992-03-01), Moronaga et al.

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