CCD Imager Digital Data Processing: Concepts and Hardware

Paul E. Dangler

doi:10.1117/12.952623

5 April 1989 CCD Imager Digital Data Processing: Concepts and Hardware

Paul E. Dangler

Proceedings Volume 1075, Digital Image Processing Applications; (1989) https://doi.org/10.1117/12.952623
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

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.

Citation Download Citation

Paul E. Dangler "CCD Imager Digital Data Processing: Concepts and Hardware", Proc. SPIE 1075, Digital Image Processing Applications, (5 April 1989); https://doi.org/10.1117/12.952623

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