Tone value sample selection in digital image processing method e

Details Tone value sample selection in digital image processing method e Tone value sample selection in digital image processing method e

1985-05-06

1987-03-31

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 75, 358 80, 358280, 355 38, H04N 140, H04N 146, G03F 308, G03B 2780

Patent

active

046547223

ABSTRACT:
A problem in digital image processing is to automatically generate a tone reproduction function that maximizes the quality of the processed image. In an improved method for generating the tone reproduction function by normalizing the histogram of a sample of tone values, the sample of tone values is selected from an image dependent "floating" contrast interval using the statistical parameters of the distribution of tone values in the sample itself for the selection criteria. A plurality of histograms are formed from the tone values in a plurality of contrast intervals, and the most nearly normal histogram is selected for normalization.

REFERENCES:
patent: 4410909 (1983-10-01), Ueda et al.
patent: 4467364 (1984-08-01), Konagaya
patent: 4472736 (1984-09-01), Ushio et al.
"A New Approach to Programming in Photomechanical Reproduction," Yu. Ovchinnikov et al, W. Banks IPC Science and Technology Press, Guildford, England, 1974, pp. 160-163.

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