Polaroid Corporation

Other

Guillermo S Ferla

Walter P Haimberger

Robert Francis Hartmann

Fawwaz N Habbal

Janet A Allen

Dean Gross

Printing apparatus and method particularly suited to provide a hardcopy of an image produced by medical imaging equipment or the like. The method produces an area modulation hardcopy having a large number of gray levels per area modulation cell (pixel) and a strong density sensitivity. Pixel areas are modulated in patterns consisting of pels which in turn are made up of subpels referred to as slices which are preferably added to minimum sized pels by pulse width modulating two different sized printing radiation beams.

Apparatus and method for modulating the area of pixels for tone

Printing apparatus particularly suited to provide a hardcopy of an image produced by medical imaging equipment or the like. The apparatus produces an area modulation hardcopy having a large number of gray levels per area modulation cell (pixel) by generating in substantially adfacent columns units of subpixels called pels. The pels have an initial size that is increased by the addition of subpels referred to as slices.

Printing apparatus

A printing system employs a rotating drum for carrying a photosensitive printing medium in the form of a discontinuous sheet, there being a clamp carried by the drum and rotating therewith for holding ends of the sheet to secure the sheet to the drum. The system includes a print head having a laser beam which is spatially and temporally modulated for gray-scale printing of individual pixels of an image. The head is scanned parallel to an axis of the drum. A servomechanism responsive to angular orientation of the drum produces a linear scan during rotation of the drum. An optical system within the head provides a common path through a common objective lens for both a write laser beam and for a focus laser beam of an automatic focusing apparatus which positions the objective lens rapidly by a dither motion to compensate for undulations in the surface of the print medium. The objective lens is carried at a reference position during passage of the clamp, the reference position being updated periodically by measurements of focus.

Dynamic focusing system for use with discontinuous medium

A system and method for displaying an image for photographic reproduction operates to calibrate the brightness of the image display prior to each photographic reproduction in a manner that accounts for the variations in the brightness characteristics of the images of different scenes to be photographically reproduced.

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Reading, MA, United States of America

Guillermo S Ferla