20 May 1993 High-speed multiple channel TDI camera for document scanning applications
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Abstract
A new camera using TDI (Time Delay and Integration) technology, capable of capturing high resolution images from continuously moving documents has been successfully demonstrated. The new camera operated at a high speed (120 ips) scanning mail for high quality OCR (optical character recognition). The camera achieves a high quality throughput by using eight parallel processing channels which are digitized to 256 levels (8 bits) within the camera at a total effective speed of 80 Mhz. Previous image pickup units have suffered from low contrast and low resolution at high speed. This new camera has the ability of producing gray scale information per pixel in a relatively low (80 times less power) light environment compared to similar line scan cameras. The camera output consists of 8 channels of video digitized simultaneously to provide a resolution of 2048 pixels per line, operating to a maximum line rate of 32 kHz. Experimental results demonstrate the ruggedness of TDI and its usefulness in a field environment. Results show that contrast ability did not significantly degrade despite velocity mismatch of 2.5% between the camera and the imaged document.
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Mike Miethig, Mike Miethig, Daryl Prince, Daryl Prince, Brian C. Doody, Brian C. Doody, P. Tom Jenkins, P. Tom Jenkins, Don J. Blacklock, Don J. Blacklock, Dale DuVall, Dale DuVall, } "High-speed multiple channel TDI camera for document scanning applications", Proc. SPIE 1901, Cameras, Scanners, and Image Acquisition Systems, (20 May 1993); doi: 10.1117/12.144783; https://doi.org/10.1117/12.144783
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