Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-07-02
1985-04-16
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
356380, 356387, 356386, 358101, 358106, 358108, 360 91, 360 721, H04N 718
Patent
active
045119180
ABSTRACT:
An automatic scanning and control apparatus determines the location of a predetermined segment of an image field being scanned. The predetermined segment presents an image which is optically differentiatable from the surrounding area of the image field. The apparatus includes a beam device for selectively scanning the image field and producing an output signal thereof. The beam device includes means for modulating the output signal in accordance with variations in the image field. The predetermined segment of the image field causes modulation of the output signal of the beam device by providing an inflection therein when the beam scans across the segment. An analyzing circuit is adapted to accept the output signal from the beam device. Means generate a locating signal in predetermined time relation to the scanning. Comparator means compare the inflection in the output signal with the locating signal so that the location of the predetermined segment of the image field can be determined. A method compares an image field to be inspected with a standard image field. A standard image field is scanned with a beam and a video signal is modulated in accordance with intensity variations in the standard field. The video signal is recorded on a recording member. The field to be inspected is then scanned by the beam and a second video signal is generated. Both the video signals are reproduced and passed to a comparator means.
REFERENCES:
patent: 2353631 (1944-07-01), Bliss
patent: 2816162 (1957-12-01), Johnson
patent: 2918656 (1959-12-01), Nolde
Britton Howard W.
Markva Neil F.
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