Document Type
Thesis
Date of Award
12-31-1990
Degree Name
Master of Science in Electrical Engineering - (M.S.)
Department
Electrical and Computer Engineering
First Advisor
Walter F. Kosonocky
Second Advisor
Eugene I. Gordon
Third Advisor
Kenneth Sohn
Abstract
A CCD camera for the gray scale document line scanner has been designed and developed at Photon Imaging Corp. The scanner consists of a revolutionary optical fiber bundle, CCD camera, and control electronics. The key concept resides in the fiber-optic bundle. At one end it has a linear array of equally spaced light guides. These terminate at the opposite end in a square array with a polished surface for viewing by a camera. The fan-out from linear to square end is not done with attention to ordering, so the bundle may be relatively inexpensive. Reordering is done electronically using an address map unique to each bundle. The CCD used is a virtual phase imager from Texas Instruments with a resolution of 165 x 204 pixels. The CCD clocking sequence is generated using EPROM and different voltage levels are switched using fast switching transistors. The CCD chip output is compensated for dark voltage with run time dark voltage reference. The output of the camera is digitized by a flash analog to digital converter and stored in the scanner memory. The Scanner/camera has a serial interface to transfer the data from memory to a host computer, PC. For serial communication HDLC protocol is used. The scanned document can be viewed on the PC monitor or can be printed for hard copies with half tone techniques to preserve gray scale information. The scanner has a resolution of 300 dpi, compatible with todays laser printers.
Recommended Citation
Joshi, Aniruddha P., "Design and development of CCD camera for document scanner using optical fiber bundle" (1990). Theses. 2771.
https://digitalcommons.njit.edu/theses/2771
