Photocopying – Projection printing and copying cameras – Multicolor picture
Patent
1988-06-28
1989-12-19
Griffin, Donald A.
Photocopying
Projection printing and copying cameras
Multicolor picture
355 77, G03B 2732, G03B 1328
Patent
active
048886114
ABSTRACT:
A method for converting a continuous tone image on a transparency, negative or the like into a halftone image includes the steps of providing a plurality of light-responsive elements upon a surface, each element adapted to generate a local electromagnetic field proportional to the relative intensity of light directed upon that element, a field of one element adapted to interact with fields of other, adjacent elements, directing light through the transparency upon the elements on the surface in a pattern of light and shadow to cause each element to generate a local field proportional to the magnitude of light directed upon that element, allowing the fields of the respective elements to interact to cause the elements to move upon the surface to achieve an equilibrium with the relative spacing of elements in at least one region being in proportion to the intensity of light directed upon that region, and recording the relative positions of the elements in that region for creating a halftone image of a corresponding region of continuous tone image. A system for converting a continuous tone image into a halftone image is also described.
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