Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1980-01-31
1982-09-21
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358282, 250211J, H04N 314
Patent
active
043510043
ABSTRACT:
A CCD imager is provided with an adaptive threshold circuit. The variations in the illumination across the document being read by the imager are compensated for by the adaptive threshold circuit to accurately provide an accurate digital representation of the image on the document.
REFERENCES:
patent: 3877821 (1975-09-01), Price et al.
patent: 4216503 (1980-08-01), Wiggins
Michael G. Kovac "Charge Transfer Image Sensor" 9-6-73, RCA Technical Notes #937.
Choate William C.
Ho David S.
Coles Edward L.
Comfort James T.
Groover III Robert
Richardson Robert L.
Sharp Melvin
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