System for accommodating defective sensors in a scanning array

Details System for accommodating defective sensors in a scanning array System for accommodating defective sensors in a scanning array

H - Electricity

04

N

350/9

H04N 1/04 (2006.01)

Patent

CA 1162639

ABSTRACT OF THE DISCLOSURE An image input terminal (IIT) with automatic document handler for feeding documents to be scanned into registered position on the IIT platen. The IIT includes a pair of multi-element scanning arrays with cooperating scan lamp and optics on a movable carriage disposed in scanning relationship with the platen. Analog image signals generated by the scanning arrays are initially processed in separate channels and then combined into a serial stream. The stream of analog image signals may optionally be thresholded or screened to provide binary level image signals or converted to multi-bit gray scale. A control system including microprocessor provides timing and control signals for synchronizing operation of the scanning carriage, document handler, and image signal reading and processing together with electronic crossover between arrays to avoid loss of data, automatic signal gain control, and deletion of bad image signals or pixels.

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