Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1985-05-06
1987-01-13
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 75, 358280, 358284, 355 38, G03F 308, H04N 146, H04N 140, G03B 2780
Patent
active
046368450
ABSTRACT:
In a method of digital image processing employing a tone reproduction function generated by normalizing the histogram of a sample of tone values selected from the image, it is an object to automatically detect images that were derived from over or under exposed photographic originals and to adjust the tone scale of such images to improve their appearance. The invention achieves this objective by testing the skewness of the sample of tone values of the image and if the amount of skewness exceeds a predetermined amount, adjusting the contrast of the processed image by an amount equal to the value of a standard variate computed for the sample at a mean tone value of the sample minus the value of a standard variate computed for the sample at a mode of the tone values of the sample.
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patent: 4339517 (1982-07-01), Akimoto
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", by Yu. Ovchinnikov et al., W. Banks IPC Science and Technology Press, Guildford, England, 1974, pp. 160-163.
Alkofer James S.
Eastman Kodak Company
Groody James J.
Svihla Randall S.
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