Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-05-17
1989-09-19
Church, Craig E.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
378 99, H04N 532
Patent
active
048686514
ABSTRACT:
A process for enhancing a still video image can correct digital fluoroscopy images which are under- or overexposed and have their image brightness values concentrated to one end of the gray scale. A pixel histogram is formed, but is clipped at a low value. Then, a cumulative histogram is formed from the clipped histogram. The cumulative histogram, which has a generally linear slope, is normalized and is used for mapping the brightness of luminance values of the original image. The new values form an optimal video image with the gray scale values spread over the entire range. The image shows details not only in the middle gray areas, but in the light and dark areas as well.
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Chou Tzeyang J.
Elderbroom Fred
Flatau Ralph
Ma Marshall
Church Craig E.
Freeman John C.
S&S Inficon Inc.
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