Time Characteristics of the Imaging Quality Degradation Caused by Aero-Optical Effects Under Hypersonic Conditions

Ju, Lin; Fan, Zhigang; Liu, Bo; Yue, Ming; Shi, Xiaotian; Li, Xueshen

doi:10.1109/jphot.2022.3206224

Cited by 7 publications

(8 citation statements)

References 29 publications

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“…A. Bias Field Estimation 1) Using surface fitting to solve b: The temperature field distribution on the surface of the optical hood is continuous due to aerodynamic heating [9], [36]- [41], so the thermal radiation bias field has smoothness and continuity. In order to make the obtained bias field surface have the above properties and reduce the bias field affected by the details of degraded image, we use Bézier surface fitting to approximate the estimated bias field b i in (2).…”

Section: Progressive Thermal Radiation Nonuniformity Correction Modelmentioning

confidence: 99%

“…1. The imaging results subjected to thermal radiation will be superimposed on the real IR image with a fixed pattern of thermal radiation noise, i.e., thermal radiation bias field, the quality of IR imaging is greatly reduced, and the target detection distance is significantly reduced [2]- [9]. In addition, affected by high-speed airflow heating, the optical path outside the optical window will change, resulting in blurring, shaking and moving of the image.…”

Section: Introductionmentioning

confidence: 99%

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Progressive Nonuniformity Correction for Aero-Optical Thermal Radiation Images via Bilateral Filtering and Bézier Surface Fitting

Liu

Xiong

et al. 2023

IEEE Photonics J.

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When a high-speed aircraft flies in the atmosphere, the imaging window is subjected to airflow friction, the kinetic energy of the airflow is converted into thermal energy, which makes the surface temperature of the imaging window rise unevenly, the imaging quality is significantly reduced, called aerooptical thermal radiation effects. The continuously increasing nonuniform thermal radiation bias field is not conducive to the precise identification of the target. To remove the bias field in degraded infrared images, this paper proposes a progressive nonuniformity correction method. First, we establish a progressive thermal radiation effects correction model to estimate the thermal radiation bias field based on bilateral filtering and Bézier surface fitting. Then, to avoid overfitting the bias field, the degree of Bézier surface is reduced progressively during the iterative process. Finally, according to the properties of the heat transfer of the aero-optical thermal radiation effects, a gradient orientation prior is imposed for both the thermal radiation bias field and the latent clear image. experiments on simulated degraded images and real degraded IR images show that our method can reduce the thermal radiation effects residual compared with the current aero-optical thermal radiation effects correction methods. The code will be publicly available upon acceptance.

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Section: Progressive Thermal Radiation Nonuniformity Correction Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Progressive Nonuniformity Correction for Aero-Optical Thermal Radiation Images via Bilateral Filtering and Bézier Surface Fitting

Liu

Xiong

et al. 2023

IEEE Photonics J.

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“…Due to the aerodynamic thermal effect, the flow field and optical window outside the imaging system of a high-speed vehicle become non-uniform local thermal equilibrium media. This results in multi-dimensional characteristics such as refractive index, absorption characteristics, and radiation characteristics becoming non-uniform in spatial and temporal domains [16]. Consequently, the complex amplitude of infrared radiation of the target and background changes when it passes through the inhomogeneous medium, leading to blurred, jittery, distorted, and saturated imaging results [1].…”

Section: Accurate Characterization Model For Full-chain Imaging Featu...mentioning

confidence: 99%

“…The imaging results in an aerodynamic thermal environment are affected by various factors, including atmospheric transport, aero-optical and aero-thermal radiation effects, optical systems, imaging sensor arrays, image processing, and other components [16].…”

Section: Full-chain Imaging Model Adapted To Aerodynamic Thermal Envi...mentioning

confidence: 99%

“…Luo et al established a differential ray equation solution format based on Cellular Automata to achieve efficient numerical calculation of aero-optical effects [14,15]. Ju et al studied the influence of aerooptical and aero-thermal radiation effects on the degradation of imaging quality under timevarying conditions based on the ray tracing method [16].…”

Section: Introductionmentioning

confidence: 99%

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Accurate characterization of full-chain infrared multispectral imaging features under aerodynamic thermal environment

Yang¹,

Zhang²,

Liu³

et al. 2023

Preprint

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The detection performance of infrared imaging systems during high-speed flight is significantly impacted by aero-optical and aero-thermal radiation effects. However, traditional numerical calculations struggle to balance accuracy and efficiency, and there is a lack of a comprehensive model for infrared imaging in an aerodynamic thermal environment. In this study, we propose a calculation method based on Cellular Automata (CA) ray tracing, which allows for parallel calculation of aero-optical and aero-thermal radiation effects by combining optical field transport rules with the cellular space obtained by interpolation under fluid-solid boundary constraints. Using this method, we extend the traditional imaging feature prediction model of the infrared imaging system to obtain an accurate characterization model of the full-chain imaging features adapted to the aerodynamic thermal environment. Finally, we investigate the characteristics of infrared multispectral imaging system in various spectral bands under the influence of aero-optical and aero-thermal radiation effects. With this full-chain imaging model, the key elements of the imaging system under aerodynamic thermal environment can be globally optimized.

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Dynamic Analysis on Impact of Aero-Optics Under Dynamic Conjoint Supersonic Boundary Conditions

Wang,

Chen

et al. 2023

IECON 2023- 49th Annual Conference of the IEEE Industrial Electronics Society

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Time Characteristics of the Imaging Quality Degradation Caused by Aero-Optical Effects Under Hypersonic Conditions

Cited by 7 publications

References 29 publications

Progressive Nonuniformity Correction for Aero-Optical Thermal Radiation Images via Bilateral Filtering and Bézier Surface Fitting

Progressive Nonuniformity Correction for Aero-Optical Thermal Radiation Images via Bilateral Filtering and Bézier Surface Fitting

Accurate characterization of full-chain infrared multispectral imaging features under aerodynamic thermal environment

Dynamic Analysis on Impact of Aero-Optics Under Dynamic Conjoint Supersonic Boundary Conditions

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