Image processing apparatus for logarithmically converting an image input signal into a density signal and standardizing the input range of the image input signal with the same conversion table
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United States of America Patent
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Sep 5, 1989
Issued Date -
N/A
app pub date -
Feb 16, 1988
filing date -
Mar 8, 1983
priority date (Note) -
Expired
status (Latency Note)
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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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