Method and apparatus for concealing errors in a digital televisi

Details Method and apparatus for concealing errors in a digital televisi Method and apparatus for concealing errors in a digital televisi

1982-05-26

1985-02-05

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 21R, 358163, 358314, 358167, 382 54, 382 52, H04N 514

Patent

active

044981040

ABSTRACT:
The digital signal values of adjacent picture points of pairs of points straddling the picture point currently being processed in every direction are compared in terms of only their more significant bits to determine which, if any, of the pairs involve a difference of value greater than a predetermined threshold. The determination that such a value difference is present is treated as the recognition of a picture contrast feature and causes, through operation of a read-only memory, the exclusion of such a picture point pair from the averaging process for producing a substitute value for the picture point currently under processing when the latter is found unusable by means of an error-detector. The resulting system for concealing errors detected in television picture avoids disturbing the outlines of picture features as other systems do which substitute averages of neighboring picture points for picture points found to be erroneous.

REFERENCES:
patent: 2921124 (1960-01-01), Graham
patent: 3925811 (1975-12-01), Kenney
patent: 4232340 (1980-11-01), Fuhrer
patent: 4368483 (1983-01-01), Liu
patent: 4389672 (1983-06-01), Bowen et al.
Journal of the SMPTE; "Digital Television Image Enhancement", by John Rossi, vol. 84, pp. 545-551, (1975).
"Digital Techniques for Reducing Television Noise" by John P. Rossi, SMPTE Journal, Mar. 1978, vol. 87, pp. 134-140.

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