Gradation processing method for a radiation image recording syst

Details Gradation processing method for a radiation image recording syst Gradation processing method for a radiation image recording syst

1980-07-11

1982-08-24

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358174, 358160, 358111, H04N 530

Patent

active

043464068

ABSTRACT:
In a radiation image recording system using a stimulable phosphor in which a radiation image is once recorded and then read out by use of stimulating rays impinging thereupon, the gradation of the image is processed by setting the read out level of the read out system and by setting the gain of the read out system. Among the image signal read out from the stimulable phosphor, the maximum Smax, the minimum Smin and the average S are determined. When logSmax-logSmin is less than a predetermined value, Smin is made a standard input signal. When it is more than the predetermined value, S or (logSmax+logSmin)/2 is made a standard input signal. The standard input signal is read out as a predetermined level of a standard output signal. Further, the gain of amplification in the image read out system is controlled to be .DELTA.s/(logSmax-logSmin) in the former case, and is fixed in the latter case, where .DELTA.s is a reproduced signal region.

REFERENCES:
patent: 3859527 (1975-01-01), Luckey

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