Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1989-10-02
1991-07-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
250337, G01N 2186
Patent
active
050327330
ABSTRACT:
After an image signal made up of a series of image signal components is detected from a recording medium on which a radiation image may be recorded, a characteristic value which represents the maximum change in the value of the image signal components corresponding to positions located along each of a plurality of lines distributed over the overall region or over a partial region of the recording medium is calculated. A representative value, which is representative of a plurality of the characteristic values, is calculated. Alternatively, after the image signal is detected, the probability density function of the image signal components corresponding to the overall region or to a partial region of the recording medium is created, and a characteristic amount, which represents a specific characteristic of the probability density function is found. The representative value or the characteristic amount is compared with a predetermined value. A judgment as to whether the region has or has not been exposed to radiation is based on the results of the comparison.
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Funahashi Takeshi
Takeo Hideya
Fuji Photo Film Co. , Ltd.
Nelms David C.
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