Method and apparatus approximately correcting errors in a digita

Details Method and apparatus approximately correcting errors in a digita Method and apparatus approximately correcting errors in a digita

1982-03-12

1984-11-27

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358167, 358280, 358314, H04N 514, H04N 521

Patent

active

044853998

ABSTRACT:
Picture points represented by a digital signal that is found to be in error are set to zero (black) value. Incoming 8-bit signals are twice delayed by one line delays, and 8-bit shift registers are provided for the undelayed, once delayed and twice delayed signals, each shift register providing three places for successive picture points. Averages are continuously formed horizontally, vertically and on both diagonals about every picture point, and when one value which is averaged is faulty, the divider at the output of the addition stage has its divisor changed from 2 to 1. The averages themselves are averaged to eliminate averages that are unusable because both inputs are faulty. The color television signal must be separately coded for the color and luminance information, and essentially the same scheme may be used for covering over errors in the color information as in the luminance information.

REFERENCES:
patent: 4213150 (1980-06-01), Robinson
patent: 4220972 (1980-09-01), Geokezas
patent: 4334237 (1982-06-01), Reitmeier
patent: 4395729 (1983-07-01), Lewis
patent: 4398210 (1983-08-01), Liu
patent: 4399454 (1983-08-01), Warnock
Digital Television Image Enhancement, by Johm Rossi, Journal of the SMPTE, vol. 84, Jul. 1975, pp. 545-551.
Publication "Digital Video Recording: Some Experiments in Error Protection", by C. D. Mathers, M.Sc., in BBC Research Report, Feb. 1976 issue, pp. 1-4.

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