Method and device for adjusting a hard-copy-unit

Details Method and device for adjusting a hard-copy-unit Method and device for adjusting a hard-copy-unit

1995-05-08

1998-02-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358406, 358475, 358504, 382167, H04N 140

Patent

active

057216231

ABSTRACT:
A hard-copy-unit (HCU) or camera for recording medical images on film needs regular calibration to compensate for differences in film and film processing. This can be done by making a hard copy (HC) with a number of predetermined grey values and measuring the resulting optical densities on the hard copy. From the resulting optical density values new brightness (B) and contrast (C) parameters are determined that will result in the correct maximum and minimum optical densities of subsequently exposed and processed images on film.

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