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This article teaches that a redundant array can be added to a scanning array to improve reliability, image quality, array yield, and field maintenance.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
90% of the total text.
Page 1 of 2
Redundancy for Document Scanners
This article teaches that a redundant array can be added to a scanning array
to improve reliability, image quality, array yield, and field maintenance.
The invention comprises two image scanning devices 11 and 12, arranged in
parallel and feeding respective offset gain compensation circuits 13 and 14. The
signals from both offset gain compensation circuits 13 and 14 feed into an analog
multiplexer 15 which has an output 16 leading to an analog-to-digital (A/D)
converter 17. The analog multiplexer 15 is controlled by a control circuit 18. It
will be assumed that the arrays 11 and 12 both contain defects in various
locations but that they do not contain a defect in the same location.
The mirror imaging technique known in the prior art is utilized to place the
same image on the two different devices 11 and 12. Thus, the devices 11 and 12
can be utilized to assure that a full image is received even though one or both of
the devices may be partially defective. By selective switching between the two
offset gain compensation circuits by means of the analog multiplexer, a perfect
image is fed via line 16 to the A/D converter 17.
The control circuit 18 is utilized to control the analog multiplier 15 and would
be programmed during the black-white calibration scan that is performed at the
beginning of each document.
This permits the utilization of partially good scanning devices but at the same
time removes dark signal and photo-response non...