Image calibration of laser digitizers, printers, and gray-scale displays.
Laser film digitizers, interactive gray-scale monitors, and laser film printers are necessary to transmit digital image information. These devices must be standardized so that hard- and soft-copy images are as similar as possible. Standardization of appropriate calibration procedures is necessary to attain this goal. Radiographs are converted into digital data representations by a laser film digitizer. These representations (and those obtained with other modalities) are transferred to a laser film printer or to an interactive monitor with gray-scale display. To obtain the best gray-level fidelity, printer output optical densities should be identical to those of the input film. Laser printers should be calibrated regularly to ensure uniform results. A gray-scale controller functions as an adjunct to the host computer and can automate the calibration process. Gray-scale controller functions may someday be incorporated into an accelerator or array-processor board.
Siegel
E L
EL
Department of Diagnostic Radiology, Bell Memorial Hospital, University of Kansas Medical Center, Kansas City 66103.
Templeton
A W
AW
Cook
L T
LT
Eckard
D A
DA
Harrison
L A
LA
Dwyer
S J
SJ
D002138:Calibration; D003116:Color; D003199:Computer Systems; D003626:Data Display; D003720:Densitometry / Q000295:instrumentation; D004867:Equipment Design; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D007834:Lasers; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation