ANALYSIS AND MODELLING OF PASSIVE AND ACTIVE IMAGING SYSTEMS

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Authors
  1. Simard, J-R.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN)
Abstract
In many applications where information has to be gathered from a remote position, imaging has been one of the most common techniques chosen to satisfy this need. These applications where imaging plays a large role are numerous. Remote minefield detection, surveillance, and robotics are only a few of these applications. Therefore, the evaluation and comprehension of the limitations associated with a particular imaging system are the first steps to an adequately designed application. This document aims to answer two important questions for this objective: is the resolving power appropriate and do I have an adequate signal level for the application? Two types of imaging systems will be considered: passive and active. The resolution analysis is based on the Modulation Transfer Function (MTF) theory. Six independent processess associated with the imaging system are modelled: the optical imaging function; photodetecting; the electronic filtering effect; sampling; and reconstruction. In addition, the special case of the active imaging process is discussed on the same principle basis. Secondly, the signal expected from a particular application is analyzed for the type of imaging system used and the object looked for. Finally, noise models are shown with special attention to the photon and the speckle noise.
Report Number
DRES-M-1436 — Memorandum
Date of publication
01 Mar 1994
Number of Pages
80
DSTKIM No
95-00748
CANDIS No
143611
Format(s):
Hardcopy;Document Image stored on Optical Disk

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