Image processing apparatus for logarithmically converting an ima

Details Image processing apparatus for logarithmically converting an ima Image processing apparatus for logarithmically converting an ima

1988-02-16

1989-09-05

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 358443, 358447, G03F 308, H04N 140, H04N 146

Patent

active

048643920

ABSTRACT:
An image processing apparatus comprises an input device for entering an image input signal and a detector for detecting a characteristic, such as contrast, gradation or the like, of the input signal. A converter converts that characteristic of the input signal, in response to the detected characteristic. The converter includes a conversion table addressably by the input signal, and preferably includes a calculator for calculating the conversion table in response to the detected characteristic. Preferably, the converter carries out logarithmic conversion of the input signal. Several such tables may be provided, an appropriate one being selected depending upon input conditions. One or more such tables may have variable contents determined in response to the detected characteristic of the input signal. The converters may each comprise one or more memories storing a respective conversion table addressable by the input signal.

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