Noise reduction apparatus for reducing noise in decoding of movi

Details Noise reduction apparatus for reducing noise in decoding of movi Noise reduction apparatus for reducing noise in decoding of movi

1995-02-03

1997-03-11

Mancuso, Joseph

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358430, 358433, 358539, 348607, H04N 138, H04N 1415, H04N 1417

Patent

active

056107293

ABSTRACT:
In picture decoding from compressed data, noise component is predicted for each pixel, and noise-free original picture data is predicted from the predicted noise component and the decoded picture data, thus permitting picture quality improvement to be obtained.
Horizontal and vertical picture noise reduction circuits are provided such that they are the same in the process contents and are different in the direction of data processing. An activity calculation circuit derives the activity of block-based decoded picture data, and a block mean noise prediction circuit predicts block mean noise according to the activity obtained in the activity calculation circuit. A pixel noise prediction circuit derives predicted noise in each pixel from the predicted block mean noise obtained in the block mean noise prediction circuit and the activity obtained in the activity calculation circuit. A filter coefficient determining circuit determines filter coefficients. A filter circuit predicts and outputs noise-free picture data.

REFERENCES:
patent: 5091782 (1992-02-01), Krause et al.
patent: 5144426 (1992-09-01), Tanaka et al.
patent: 5387938 (1995-02-01), Fukuda et al.
"Iterative Procedure for Reduction of Blocking Effects in Transform Image Coding", IEEE Transactions on Circuits and Systems for Video Technology, by Avideh Zakhor, vol. 2, No. 1, Mar. 1992, pp. 91-95.

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