Digital method of modifying an image contrast so as to retain im

Details Digital method of modifying an image contrast so as to retain im Digital method of modifying an image contrast so as to retain im

1989-06-26

1991-03-12

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 79, 358455, H04N 557

Patent

active

049997114

ABSTRACT:
The method has for its object to enhance the contrast of an image, more specifically a low-contrast infrared image. The method is used in a system for putting the method into effect, more specifically an infrared camera operating in real time. The output image is structured with the aid of a transformation function (FI) one part of which (RCI) transforms the contrast of the warm points; the output histogram (HSI) has a higher contrast than the input histogram (HE). The point GO is determined for each image as a function of the characteristics of the input histogram (HE).

REFERENCES:
patent: 4353092 (1982-10-01), Bailey
patent: 4647963 (1987-03-01), Johnson
patent: 4682229 (1987-07-01), Clates
patent: 4730212 (1988-03-01), Wojcik
patent: 4805123 (1989-02-01), Specht
patent: 4878114 (1989-10-01), Huynh

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