Visibility expander

Details Visibility expander Visibility expander

1978-07-03

1980-10-21

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 96, 358111, 358166, 364515, H04N 718

Patent

active

042297648

ABSTRACT:
Disclosed is a visibility expander of relatively simple and inexpensive construction for use in reading X-ray photographs. It comprises a TV picture tube and monitor coupled, together via a low pass filter and window amplifier in series as stated. Both the expansion factor and the midpoint of the window(amplifier transfer characteristics are continuously variable so that the operator may better detect changes to picture contrasts. It may be used by doctors, X-ray technicians, investigative agencies and others who need a simple and inexpensive device for analyzing X-ray photographs.

REFERENCES:
patent: 3214515 (1965-10-01), Eberline
patent: 3249690 (1966-05-01), Schubert
patent: 3354266 (1967-11-01), Dinenno
patent: 3678188 (1972-07-01), Okumura
patent: 3706851 (1972-12-01), Froehlich
patent: 3936598 (1976-02-01), Newitt
patent: 4013833 (1977-03-01), Zimmerman
patent: 4020279 (1977-04-01), Gautier
patent: 4125858 (1978-11-01), Hounsfield
Revesz et al., "Electronic Techniques for Radiological Image Processing," Medical and Biological Engineering, vol. 7, pp. 393-399 (1969).
Bickel et al., "A Delay-Line Synthesized Filter Bank with Electronically Adjustable Impulse Response," Federal Scientific Corporation, pp. 489-496.

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