In the infrared detection and imaging system, due to the influence of detector aperture, system imperfection, measurement noise and other factors, the infrared detection image usually has the disadvantages of low contrast, poor signal-to-noise ratio, blurred visual effect and so on. In order to solve this problem, this paper proposes an infrared image denoising and enhancement algorithm based on the guidance filter. The algorithm realizes a linear shift local linear filter by introducing the guidance image as the prior information, so as to enhance the edge details of the infrared image and remove the image noise at the same time. The simulation results show that compared with the traditional denoising and enhancement algorithm, this method can effectively improve the visual effect of infrared detection image, enhance the edge detection information of the target, and has the advantages of fast processing speed.
Gyro stabilized platform is sensitive to external angle change, and is mainly used to effectively isolate the influence of angle disturbance on the attitude maintenance of stabilized platform[1-3]. In order to provide the simulation environment of external angle disturbance for the stable platform, this paper designs an azimuth and pitch two-dimensional angular motion excitation device, which can effectively simulate the low-frequency angular disturbance condition below 20Hz. The angular motion range can reach ±50°azimuth, and the pitch axis can reach ±70°. The positioning accuracy is 10″. The device provides a good man-machine interface, which can display the motion data of each axis in real time. At the same time, considering the safety of use, the design has electrical, software and mechanical multi-level limit measures, which can realize automatic monitoring and system protection.
The detection, recognition and tracking of moving targets are important research contents of photoelectric detection technology, and the evaluation of tracking performance needs corresponding test and verification environment. In this paper, a high stable angle motion simulation device of infrared/visible target is designed. The tested product and the optical axis of infrared/visible target are quickly aligned by optical alignment device. At the same time, the angular motion simulation device can accurately measure and control the position, angle and angular acceleration information of the target relative to the tested product, and the angular motion range can reach 360° forward and reverse continuous rotation. The design can effectively simulate the target's one-dimensional angular motion environment in the laboratory, and provide test conditions for the tracking performance evaluation of photoelectric detection technology.
Vibration is one of the main factors that greatly affect the tracking and stability of photoelectric detection. With the development of technology for many years, the simulation of vibration conditions has gradually developed from single line vibration or angle disturbance to line angle compound vibration. In this paper, the working principle and application of two kinds of multi-degree of freedom line-angle composite vibration system are introduced, and the differences between the two main mechanisms and simulation systems are compared and analyzed, which provides a theoretical support for the photoelectric detection technology to carry out the vibration reproduction test in the laboratory.
In order to improve the readability of infrared image, this paper proposes an image fusion algorithm based on the characteristics of the target region. The algorithm uses wavelet transform to decompose the multi-source image, and uses image segmentation algorithm to extract the target features of the multi-source image, and then uses different fusion strategies to fuse the infrared image and the visible image according to the features of the infrared image extraction and the low-frequency and high-frequency components of the visible image in different regions. The simulation results show that the algorithm can achieve better image fusion results.
In this paper, a design configuration of infrared guiding source for laser cooperative target is proposed. In this configuration, the infrared radiation target surface can effectively reduce the heat dissipation speed and ensure the uniform distribution of temperature radiation at the edge and the center by setting a wind shield, an independent edge circular electric heating film and a temperature PID control loop. It can provide effective infrared characteristic target for infrared / laser common optical path ranging system and guide laser ranging accurately.
This paper presents a portable infrared/visible composite target simulator design configuration. The system adopts reflective optical design, through the combination of blackbody and visible light source system design and a variety of target plate, it can provide 0.4μm~12μm band simulation target, with parallel difference better than 10″ and 200mm optical aperture. It provides a variety of quasi-direct simulation targets for infrared and visible performance and dynamic tracking test of photoelectric detection equipment.
The infrared dynamic scene projector is a key component of the infrared imaging seeker semi-physical simulation system. Aiming at the long-wave infrared imaging seeker system, the design idea of long-wave infrared dynamic scene projector with IR-CRT as the core device was proposed. The working principle of IR-CRT was introduced. The optical collimation system was designed. The key parameters such as resolution, distortion, simulated temperature range and uniformity were tested. The dynamic scene projector had been successfully applied to infrared imaging seeker. The semi-physical simulation system had verified the static and dynamic tracking performance of the infrared imaging seeker, which met the requirements of product use, and promoted the product development process.
In this paper, an over-top tracking test system for electro-optical detection device is designed, which provides an overtop test environment for electro-optical detection device by using a two-dimensional motion turntable covering the target source of the infrared and visible light bands in a rolling and pitching shafting system. The electro-optical detection device for two-frame configuration provides over-top tracking function and performance testing and verification conditions.