Controlling the grey levels represented by a video signal

Details Controlling the grey levels represented by a video signal Controlling the grey levels represented by a video signal

1980-09-19

1987-07-21

Blum, Theodore M.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 514, H04N 5208

Patent

active

046822291

ABSTRACT:
A digital buffer store 25 (FIG. 2) stores digitized samples of a video signal. A circuit 206 determines the mean grey level (f(b)) of the stored signals and a circuit 28 forms a histogram indicating the number of pixels having various ones of 8 possible grey leves. A circuit 29 determines the dispersion of the histogram about the mean grey level. In principle, circuit 29 could determine from the means level and the histogram the statistical distribution of pixels amongst the grey levels and from that determine the standard deviation as a measure of dispersion. In practice, the circuit 29 determines an emirical approximation to the dispersion, ##EQU1## where n=number of binary bits=3

REFERENCES:
patent: 3979555 (1976-09-01), Opittek et al.
patent: 4268863 (1981-05-01), Los
Weszka et al--"Threshold Evaluation Techniques", IEEE Transactions on Systems, Man, and Cybernetics, vol. SMC-8, No. 8, Aug. 1978, pp. 622-629.
Nakagawa et al--"A Note on the Use of Local Min and Max Operations", IEEE Transactions on Systems, Man, and Cybernetics, vol SMC-8, No. 8, Aug. 1978, pp. 632-635.

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