Infrared and visible images have their own characteristics and different imaging principles, the targets be detected by any kind of sensor have their own advantages and disadvantages. In this paper, the characteristics of infrared and visible light images in dim and small target detection are analyzed, and pseudo-color infrared and visible light image fusion detection methods of dim and small target based on visual attention is studied, and its fusion detection effect is analyzed. The research shows that the fusion algorithm in this paper is more effective for targets with complex background and low contrast, and this method only makes pseudo-color mapping on a local area of the target, which is not easy to cause visual fatigue.
Detection, tracking, characterization and identification of space targets orbiting the Earth is one of the main tasks of the space surveillance system. Spatial target image feature extraction can find out some descriptions that reflect the essence of the target from the original image. The moment feature describes the statistical characteristics of grayscale by the moments of each order of image distribution, which can effectively reflect the shape information of the target. A Hu extension moment is proposed, and a feature extraction method for spatial target images is proposed based on this. It solves the problem of information loss when the confidence variance difference is large and the eigenvalue is negative. A linear combinatorial feature calculation method is proposed for spatial target classification, and a linear classifiable quantitative discrimination method is given. The image needs to be preprocessed. Then, the seven eigenvalues based on the extension moment are calculated, and the similarity analysis of the Hu extension moment is carried out. At last, the similarity of the sample target region matching is analyzed, and the target similarity can reach 90%. For image sets with multiple types of targets, according to the numerical distribution calculates the linear combination feature, linear classifiable quantitative discriminant results can be calculated. 48 images of four satellites in the database were selected as test data. Its recognition accuracy rate reaches 95.8%. Calculating the recognition result of the same platform for multi-sample joint recognition, and the probability of recognition attribution after multi-sample union is 100%.
KEYWORDS: Transmittance, Atmospheric modeling, Infrared radiation, Temperature metrology, Radiometry, Atmospheric corrections, Design and modelling, Thermography, Air temperature, Temperature sensors
Atmospheric transmittance is a key parameter in infrared measurement calibration. The transmittance of the corresponding band is usually obtained based on theoretical calculation. The air based active radiation source was mounted below the airship, and the air transmittance measurement verification test based on the air based active radiation source was carried out. The air transmittance correction could be completed to improve the accuracy of the air transmittance. A space-based active radiation source with a hemispherical shape of 400mm in diameter and a maximum weight of 130kg is designed in this paper. The radiation source temperature range can reach normal temperature to 600℃. The ground verification shows that when the actual temperature of the space-based active radiation source is higher than 155℃, the radiation brightness stability is better than ±2%, and the temperature uniformity is better than ±5℃.
KEYWORDS: Solar radiation models, Solar radiation, Radiative energy transfer, Sun, Process modeling, Heat flux, Thermal modeling, 3D acquisition, Infrared radiation
Regarding the radiation relationship between complex objects involved in the space environment, in this paper we use discrete coordinate method to calculate and analyze the coupled radiation-conduction heat transfer between complex objects. We simulate the heat conduction process by use of the finite volume method, and the overall temperature field is finally obtained. By comparing the calculation results of the program and Fluent software, the correctness of the coupled radiation-conduction heat transfer program is verified. The result shows that the radiation heat transfer between the targets could affect the temperature field under the conditions of self-emission and ambient radiation. And it also shows that an appropriate reduction of discrete points can reduce the calculation time and will not affect the calculation accuracy.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.