Constant light greyscale generator for CRT color camera system

Details Constant light greyscale generator for CRT color camera system Constant light greyscale generator for CRT color camera system

1982-01-21

1984-03-20

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 358244, H04N 146, H04N 584

Patent

active

044384530

ABSTRACT:
A hard copy of a video frame represented by periodic video signals is obtained by dividing the range of amplitude of the video signals into N levels, converting the video signals into N two-level brightness distributions on the screen of a monochromatic CRT under the condition that a pixel in the ith distribution has the upper of two levels only if the level of the video signal representing the corresponding pixel in the frame exceeds the ith level, and exposing a photosensitive sheet to light from the screen. Thus, each pixel on the sheet is exposed to light of predetermined brightness for a period of time functionally dependent on the level of the video signal represented by the corresponding pixel in the frame.

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