Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1986-12-03
1988-07-26
Ng, Jin F.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358217, H04N 5228
Patent
active
047604549
ABSTRACT:
With the signal electrode of a camera tube uniformly illuminated by diffuse light, scanning of the signal electrode by the electron beam is caused to leave unaffected certain lines or parts of lines which are scanned in the next frame. This may be done by blanking the beam out for a field, a line or part of a line in every two frames, or by shifting the lines of one field to superimpose them on those of the other field for a corresponding interval in every two frames. The video signal occurring when a previously unscanned line or line portion is first scanned is measured and compared with the previous measured value, in response to which the setting of the focussing control is shifted towards a smaller beam spot for a renewed measurement. When the signal rises to a higher magnitude, which would approximate twice the video signal of a normal scan, in the ideal case, the setting procedure is complete.
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Brinich Stephen
Ng Jin F.
Robert & Bosch GmbH
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