Method for removing coding/decoding distortion from moving-pictu

Details Method for removing coding/decoding distortion from moving-pictu Method for removing coding/decoding distortion from moving-pictu

Filed on

1992-01-03

Date issued

1993-04-13

Examiner

Britton, Howard W.

Patent Class

Facsimile and static presentation processing

SubClass

Facsimile

SubSubClass

Specific signal processing circuitry

Other Related Categories

358 85, 358133, H04N 5217

Type

Patent

Status

active

Patent number

052027643

Description

ABSTRACT:
In a moving-picture image signal processing system used in a so-called "video phone communication system", a coding/decoding distortion contained in a coded moving-picture image signal is removed therefrom. The image signal processing system includes a memory unit for previously storing plural coefficients of variation amounts with respect to pixel values of coded input image data; a subtraction unit for performing a subtraction between the pixel value of the coded input image data and a pixel value of reference image data to obtain a difference pixel value, the reference image data being obtained from distortion-free image data acquired during one image-data processing cycle before a present image-data processing cycle for the coded image data; and a distortion removing unit for removing a coding/decoding distortion contained in the input image data by processing the pixel value of the coded image data based upon these coefficients read out from the memory unit in repsonse to the difference pixel value, whereby distortion-free input image data is produced.

REFERENCES:
patent: 4442454 (1984-04-01), Powell
patent: 4498104 (1985-02-01), Schulz
patent: 4876595 (1989-10-01), Veldhuis
1990 Spring National Convention Record, The Institute of Electronics, Information and Communication Engineers, Part 7, D-306, "A Noise Reduction Filter for MC-DCT Coding"; T. Ida, et al., Mar. 5, 1990.
Institute of Electronics, Information and Communication Engineers, vol. J66-A, No. 10, "Recursive .epsilon.-Nonlinear Digital Filter", K. Arakawa, et al., Oct., 1983.

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