Adaptive amplitude averaging for weighting quantizing noise

Details Adaptive amplitude averaging for weighting quantizing noise Adaptive amplitude averaging for weighting quantizing noise

1980-05-15

1982-06-08

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358167, 375 26, H04N 521

Patent

active

043342370

ABSTRACT:
An apparatus reduces quantizing noise by averaging picture information when only low frequency information is present. Thus, high frequency detail is not lost. This is determined by looking at proximate samples to see if their amplitudes are within a selected amount of each other. The averaging typically is of two or four picture samples depending upon how great an area has only low frequencies, but greater numbers of samples can be used.

REFERENCES:
patent: 3699446 (1972-10-01), Sainte-Beuve
patent: 4095259 (1978-06-01), Sawagata
Digital Techniques for Reducing Television Noise, Rossi SMPTE, Journal; Mar. 78, vol. 87, pp. 134-140.
A Digital Noise Reducer for Encoded Ntsc Signals, McMann, SMPTE Journal; Mar. 78, vol. 87, pp. 129-133.
PCM Encoded NTSC Color Television Subjective Tests, Goldberg TSMPTE, Aug. 73, pp. 649, 654.

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