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Proceedings Paper

CCD Imager Digital Data Processing: Concepts and Hardware
Author(s): Paul E. Dangler
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Paper Abstract

In the design of any high quality scanner utilizing a linear CCD imager, a set of features is required that is largely independent of the application. At the front end, sensor clocking signals are generated and analog-to-digital conversion occurs. Next, corrections for differences in pixel dark current and gain are applied, along with pixel and/or line summing to improve the signal-to-noise ratio. The corrections and summing can be done by software, but significant speed improvements are obtained when a hardware solution is employed. The log of the data may be calculated, and the data must be supplied to some form of image storage device. RAM memory on a standard computer bus, such as VME, provides a straightforward means to configure an image storage, so long as a means to transfer sensor data to the memory is provided. This paper will begin with a review of the various ways in which data from a CCD scanner is processed for use in a digital imaging system, including the correction for dark noise variations and gain errors, data space transformations, and the use of pixel or line summing to improve signal-to-noise ratio. Following that, a high speed hardware implementation of these functions will be described.

Paper Details

Date Published: 5 April 1989
PDF: 6 pages
Proc. SPIE 1075, Digital Image Processing Applications, (5 April 1989); doi: 10.1117/12.952623
Show Author Affiliations
Paul E. Dangler, Eastman Kodak Company (United States)

Published in SPIE Proceedings Vol. 1075:
Digital Image Processing Applications
Ying-Wei Lin; Ram Srinivasan, Editor(s)

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