Dr. Zhijie Yu Profile

Dr. Zhijie Yu

at National Univ of Defense Technology

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Proceedings Article | 15 November 2018 Paper

Computer-aided infrared camouflage effectiveness evaluation method based on image saliency

Xiaopeng Cheng, Dapeng Zhao, Zhijie Yu, Jinhua Zhang, Dabin Yu

Proceedings Volume 10964, 109644G (2018) https://doi.org/10.1117/12.2506095

KEYWORDS: Camouflage, Infrared radiation, Infrared imaging, Thermography, Image fusion, Image enhancement, Feature extraction, Detection and tracking algorithms, Image processing, Infrared coatings

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This paper reports on a new computer-aided method for the infrared camouflage effectiveness evaluation of a target based on its image saliency. The image saliency of a target was computed according to its background-related features, including intensity, contrast, gradient and orientation features in one real infrared image. On the basis of the former saliency value, the camouflage effectiveness value of a target was calculated quantitatively. The results clearly indicated that the target without infrared camouflage had a low camouflage effectiveness value, while a target with good infrared camouflage (the camouflage pattern patches of the target matched well with the background) had a high camouflage effectiveness value, which proved that this method could not only reflect the infrared camouflage effectiveness of a target in the corresponding background actually but also help us differentiate the camouflage quality of different materials quantitatively. This method should be of importance for us to evaluate the infrared camouflage effectiveness of a target more quickly and objectively with the help of computers, instead of human observations.

Proceedings Article | 25 October 2017 Paper

Nonuniform distribution of phase noise in distributed acoustic sensing based on phase-sensitive OTDR

Zhijie Yu, Yang Lu, Zhou Meng

Proceedings Volume 10464, 1046429 (2017) https://doi.org/10.1117/12.2285810

KEYWORDS: Acoustics, Rayleigh scattering, Reflectometry, Polarization

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A phase-sensitive optical time-domain reflectometry (∅-OTDR) implements distributed acoustic sensing (DAS) due to its ability for high sensitivity vibration measurement. Phase information of acoustic vibration events can be acquired by interrogation of the vibration-induced phase change between coherent Rayleigh scattering light from two points of the sensing fiber. And DAS can be realized when applying phase generated carrier (PGC) algorithm to the whole sensing fiber while the sensing fiber is transformed into a series of virtual sensing channels. Minimum detectable vibration of a ∅-OTDR is limited by phase noise level. In this paper, nonuniform distribution of phase noise of virtual sensing channels in a ∅-OTDR is investigated theoretically and experimentally. Correspondence between the intensity of Rayleigh scattering light and interference fading as well as polarization fading is analyzed considering inner interference of coherent Rayleigh light scattered from a multitude of scatters within pulse duration, and intensity noise related to the intensity of Rayleigh scattering light can be converted to phase noise while measuring vibration-induced phase change. Experiments are performed and the results confirm the predictions of the theoretical analysis. This study is essential for acquiring insight into nonuniformity of phase noise in DAS based on a ∅-OTDR, and would put forward some feasible methods to eliminate the effect of interference fading and polarization fading and optimize the minimum detectable vibration of a ∅-OTDR.

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