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Effectiveness evaluation of infrared camouflage using image saliency
摘要： This paper reports on an alternative approach to the effectiveness evaluation of IR camouflage using image saliency. The master saliency and interior saliency of a target were computed according to its background-related features and internal shape features, respectively. The fusion of master saliency and interior saliency were further used to obtain a comprehensive saliency value, by which the camouflage effectiveness value of a target was finally obtained. Under the same experimental conditions, the target with camouflage matching well with the background had the highest camouflage effectiveness value, while the target without camouflage had the lowest camouflage effectiveness value, indicating that such a value can well reflect the camouflage effectiveness of different targets in a certain background. Acting as a quantitative index, the camouflage effectiveness value makes it possible for us to directly differentiate the camouflage effectiveness of not only different targets under the same conditions but also one target under different conditions, which should be useful for the development of IR camouflage materials and the deployment of military equipment in battlefield.
关键词： Infrared camouflage,Image saliency,Camouflage effectiveness,Features fusion
更新于2025-09-09 09:28:46
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Effective Medium Model of Periodic Nanolayered Transparent Shields
摘要： An innovative effective medium model based on the transfer matrix method is proposed for the simulation of 1D-periodic subwavelength metal–dielectric laminated structures excited by TM- or TE-polarized plane wave with oblique incidence angles. The homogeneous medium of each period is characterized by TM or TE complex effective permeability and conductivity. The resulting effective single layer (ESL), having the same total thickness of the multilayer laminate, is represented by a transfer matrix given by the product of the transmission matrices of the periods composing the structure. Notice that this model allows the homogenization of n-layer periods, while the effective medium approximation method is formulated for only two-layer periods. The ESL is used to compute the transmission and reflection coefficients and the shielding effectiveness of 1D-periodic nanolayered transparent coatings made by alternating layers of silver, zinc oxide, or titanium dioxide films, in the frequency range from 100 MHz up to 10 THz. The propagating wave performances of the ESL are compared with the ones given by the rigorous multilayer model. Finally, two different screens made of transparent coatings over glass are proposed and analyzed.
关键词： 1D-periodic multilayer (ML) coating,Effective homogeneous model,terahertz (THz) shielding effectiveness
更新于2025-09-09 09:28:46
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Advanced Materials for Electromagnetic Shielding (Fundamentals, Properties, and Applications) || Silver Nanowires as Shielding Materials
摘要： To date, several advanced materials have been developed in order to resolve the issue of electromagnetic interference (EMI). Among those materials, intrinsic conductive polymers, metal/polymer composites, and conductive filler/polymer composites (CPCs) are the most commonly used and extensively investigated. Metals and their polymeric composites presents high EMI shielding effectiveness, and thus dominate the EMI shielding materials. Being lightweight, processable, and corrosion resistant are important technical requirements for many EMI shielding applications. Intrinsic conductive polymers can well meet these requirements due to their inherent properties. However, their low conductivity largely limited their shielding effectiveness. CPCs, which incorporate the aforementioned properties of polymers and high conductivity of the fillers, have attracted great interest in recent years.
关键词： Silver Nanowires,EMI Shielding Effectiveness,Conductive Composites,Shielding Materials,Electromagnetic Interference
更新于2025-09-04 15:30:14