White line skipping

Details White line skipping White line skipping

1982-04-14

1983-11-01

Britton, Howard

Facsimile and static presentation processing

Facsimile

Recording apparatus

358257, 358282, H04N 117, H04N 140

Patent

active

044132875

ABSTRACT:
A white line skipping technique for data reduction is disclosed for reducing facsimile transmission time. Video processing for white line skipping centers around the use of a five element solid state linear array. The photosensitive area for each of the five elements corresponds to a single picture element for the defined resolution parameters. VID 0 is the active video signal and is processed in the normal manner for transmission. VID 1 through VID 4 comprise the look ahead scan elements. The slicing level is derived from the VID 0 peak detector which controls the video automatic gain control. Any black video elements encountered during a scan line causes a flip-flop to be set. At the end of each scan line, corresponding to one complete drum revolution, and during the lost time interval, the status of each flip-flop is sampled by the microprocessor to determine whether the scan line is entire white. The flip-flops are then reset for the next scan or drum revolution.

REFERENCES:
patent: 3448207 (1969-06-01), Green
patent: 3502803 (1970-03-01), Bigenwald
patent: 3902009 (1975-08-01), Perreault
patent: 3952144 (1976-04-01), Kolker
patent: 3955045 (1976-05-01), Ford
patent: 4329717 (1982-05-01), Logie

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