Development of MOS/CCD circuitry for video image processing
Development of MOS/CCD circuitry for video image processing
One role where CCD's compete most effectively with digital circuitry is adaptive filtering, which requires the parallel processing of large quantities of data. An extreme case is the real-time spatial convolution of video images, where the high bandwidth, and potentially large number of picture elements to be processed in parallel, make CCD transversal filters most attractive. Although fixed weight CCD filters have been demonstrated to operate at video frequencies, details of programmable filters capable of operation at this data rate have yet to be published.The major aim of this thesis is to demonstrate the capability of programmable CCD transversal filters to operate at video data rates. As a background to this work, the use of transversal filters in image processing is first discussed and it is shown that they are well suited to performing spatial convolution. The remainder of the thesis describes work leading to the design of a programmable transversal filter, which incorporates a novel differential MOS multiplier. The filter has been fabricated on a two-level polysilicon gate NMOS process, developed by the author. In order to attempt to predict the behaviour of the multiplier a program which interactively determines the MOS model parameters for the SPICE 2E.2 circuit analysis package has been developed. It has been shown that using these parameters SPICE can adequately model the absolute current levels in the multiplier, but that it is insufficiently accurate to predict its differential behaviour. In contrast, simple first-order theory has been successfully used as the basis for the design of the multiplier. Three of the transversal filters have been included in a programmable spatial convolution system. This has been used to perform edge enhancement on video images and some processed images are presented. The structure is suitable for integration as a sub-system on a VLSI component. However, the future commercial use of analogue cicuitry of this type is likely to depend upon the improvement of modelling techniques to reduce the uncertainties in the analogue design process. Without this improvement the certainty with which digital system performance can be predicted at an early stage in system design may well prove a decisive factor in the continuing swing to all-digital systems.
University of Southampton
1981
Dyson, Clive Malcolm
(1981)
Development of MOS/CCD circuitry for video image processing.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
One role where CCD's compete most effectively with digital circuitry is adaptive filtering, which requires the parallel processing of large quantities of data. An extreme case is the real-time spatial convolution of video images, where the high bandwidth, and potentially large number of picture elements to be processed in parallel, make CCD transversal filters most attractive. Although fixed weight CCD filters have been demonstrated to operate at video frequencies, details of programmable filters capable of operation at this data rate have yet to be published.The major aim of this thesis is to demonstrate the capability of programmable CCD transversal filters to operate at video data rates. As a background to this work, the use of transversal filters in image processing is first discussed and it is shown that they are well suited to performing spatial convolution. The remainder of the thesis describes work leading to the design of a programmable transversal filter, which incorporates a novel differential MOS multiplier. The filter has been fabricated on a two-level polysilicon gate NMOS process, developed by the author. In order to attempt to predict the behaviour of the multiplier a program which interactively determines the MOS model parameters for the SPICE 2E.2 circuit analysis package has been developed. It has been shown that using these parameters SPICE can adequately model the absolute current levels in the multiplier, but that it is insufficiently accurate to predict its differential behaviour. In contrast, simple first-order theory has been successfully used as the basis for the design of the multiplier. Three of the transversal filters have been included in a programmable spatial convolution system. This has been used to perform edge enhancement on video images and some processed images are presented. The structure is suitable for integration as a sub-system on a VLSI component. However, the future commercial use of analogue cicuitry of this type is likely to depend upon the improvement of modelling techniques to reduce the uncertainties in the analogue design process. Without this improvement the certainty with which digital system performance can be predicted at an early stage in system design may well prove a decisive factor in the continuing swing to all-digital systems.
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Published date: 1981
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Local EPrints ID: 459671
URI: http://eprints.soton.ac.uk/id/eprint/459671
PURE UUID: 14c62841-9f79-4765-abf9-2385eb768d9f
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Date deposited: 04 Jul 2022 17:16
Last modified: 04 Jul 2022 17:16
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Author:
Clive Malcolm Dyson
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