Image analysis – Histogram processing – For setting a threshold
Patent
1980-08-29
1983-05-17
Gruber, Felix D.
Image analysis
Histogram processing
For setting a threshold
358160, 358280, 364525, G06F 1520, H04N 519
Patent
active
043843360
ABSTRACT:
This invention provides mechanisms that detect the large dynamic range of radiant intensities in the natural environment, that use novel strategies to calculate an approximation of visual properties of objects, and that represent a scene with an image having a specific dynamic range that is optimal for display media such as photography, television and printing.
Photographs and other images are made according to the foregoing mechanisms from lightness fields produced from multiple comparisons between information associated with a different segmental areas of an image field. Different comparisons involve different groups of segmental areas, and different groupings have at least one spatial parameter different from other groupings of areas. Comparisons advantageously are made in succession with an ordered sequence of the spatial parameter and employing results of prior comparisons.
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patent: 4174515 (1979-11-01), Sternberg
patent: 4215414 (1980-07-01), Huelsman
patent: 4229797 (1980-10-01), Ledley
patent: 4231095 (1980-10-01), Cassagne
Hubel, David H. and Wiesel, Torsten N., "Uniformity of Monkey Striate Cortex: A Parallel Relationship _Between Field Size, Scatter, and Magnification _Factor", Journal of Comparative Neurology, _Dec. 1, 1974, vol. 158, pp. 295-306.
Blakemore, C. and Campbell, F. W., "On The Existence _of Neurones In The Human Visual System Selectively _Sensitive to the Orientation And Size of Retinal _Images", Journal of Physiology, 1969, vol. 203, pp. 237-260.
Andrews, Harry C., "Monochrome Digital Image _Enhancement", Applied Optics, Feb. 1976, vol. 15, No. 2, pp. 495-503.
Frankle Jonathan A.
McCann John J.
Gruber Felix D.
Liepmann W. Hugo
Polaroid Corporation
Roberson William D.
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