Image reproducing method and apparatus

Details Image reproducing method and apparatus Image reproducing method and apparatus

1996-10-31

2000-08-08

Lee, Thomas D.

Image analysis

Histogram processing

With a gray-level transformation

382167, 382274, 358461, G06K 900, G06K 940, H04N 140

Patent

active

061012734

ABSTRACT:
A histogram of a digital image signal representing a color image is formed, and a dynamic range of the image signal is calculated in accordance with the histogram. A rate of dynamic range compression corresponding to a region of the image signal, in which the signal value is comparatively large, a region of the image signal, in which the signal value is comparatively small, and/or the entire region of the image signal, is set in accordance with the dynamic range and by taking a predetermined reference level of the image signal as reference. A dynamic range compressing process is carried out on the image signal with the rate of dynamic range compression having thus been set. Gradation processing is carried out on an image signal, which has been obtained from the dynamic range compressing process, and a processed image signal is thereby obtained. A visible image is then reproduced from the processed image signal.

REFERENCES:
patent: 4340911 (1982-07-01), Kato et al.
patent: 4731662 (1988-03-01), Udagawa et al.
patent: 5012333 (1991-04-01), Lee et al.
patent: 5123059 (1992-06-01), Hirosawa et al.
patent: 5351306 (1994-09-01), Finkler et al.
patent: 5414538 (1995-05-01), Eschbach

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