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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5241

Title: Signature modelling and radiometric rendering equations in infrared scene simulation systems
Authors: Willers, CJ
Willers, MS
Lapierre, F
Keywords: Signature modelling
Radiometric
Infrared simulation
Scene rendering
DIRSIG
OSMOSIS
OSSIM
Issue Date: Sep-2011
Publisher: SPIE
Citation: Willers, CJ, Willers, MS and Lapierre, F. 2011. Signature modelling and radiometric rendering equations in infrared scene simulation systems. SPIE Security and Defence 2011, Prague, Czech Republic, 19-22 September 2011
Series/Report no.: Workflow request;7397
Abstract: The development and optimisation of modern infrared systems necessitates the use of simulation systems to create radiometrically realistic representations (e.g. images) of infrared scenes. Such simulation systems are used in signature prediction, the development of surveillance and missile sensors, signal/image processing algorithm development and aircraft self-protection countermeasure system development and evaluation. Even the most cursory investigation reveals a multitude of factors affecting the infrared signatures of real-world objects. Factors such as spectral emissivity, spatial/volumetric radiance distribution, specular reflection, reflected direct sunlight, reflected ambient light, atmospheric degradation and more, all affect the presentation of an object’s instantaneous signature. The signature is furthermore dynamically varying as a result of internal and external influences on the object, resulting from the heat balance comprising insolation, internal heat sources, aerodynamic heating (airborne objects), conduction, convection and radiation. In order to accurately render the object’s signature in a computer simulation, the rendering equations must therefore account for all the elements of the signature. In this overview paper, the signature models, rendering equations and application frameworks of three infrared simulation systems are reviewed and compared. The paper first considers the problem of infrared scene simulation in a framework for simulation validation. This approach provides concise definitions and a convenient context for considering signature models and subsequent computer implementation. The primary radiometric requirements for an infrared scene simulator are presented next. The signature models and rendering equations implemented in OSMOSIS (Belgian Royal Military Academy), DIRSIG (Rochester Institute of Technology,) and OSSIM (CSIR & Denel Dynamics) are reviewed. In spite of these three simulation systems’ different application focus areas, their underlying physics-based approach is similar. The commonalities and differences between the different systems are investigated, in the context of their somewhat different application areas. The application of an infrared scene simulation system towards the development of imaging missiles and missile countermeasures are briefly described. Flowing from the review of the available models and equations, recommendations are made to further enhance and improve the signature models and rendering equations in infrared scene simulators.
Description: Copyright: 2011 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
URI: http://hdl.handle.net/10204/5241
ISBN: 9780819488152
Appears in Collections:Safety and security
Optronic sensor systems
Advanced mathematical modelling and simulation
General science, engineering & technology

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