Straight-line optical path x-ray scanner which automatically adj

Details Straight-line optical path x-ray scanner which automatically adj Straight-line optical path x-ray scanner which automatically adj

1990-11-26

1993-06-08

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

378161, 378187, 378171, H04N 104

Patent

active

052184633

ABSTRACT:
A simple, low cost x-ray scanner providing enhanced resolution is formed by providing a straight-line optical path from an illuminating source, through the x-ray image to be scanned and thence to an imaging lens which forms an image on a CCD array. The x-ray film is fed by means of gravity to a pair of rollers, immediately above which are formed first and second apertures on either side of the roller. The film is eliminated through the apertures which provide a field stop for the optical system. A shutter immediately adjacent one of the apertures is coupled to a width-adjustment mechanism actuated by a feed guide for the film to thereby adjust the width of the aperture to the width of the film. The output of the CCD is modified to expand the output at low levels and compress it at high levels via a logarithmic mapping to adapt the high resolution CCD output to a lower resolution video display processor.

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