In order to carry out the research on the spectrum characteristics and application of target in long-wave infrared band, this paper independently designed and developed a long-wave infrared imaging spectrum system based on filter and high-precision runner. This system is mainly composed of optical system, filter wheel, electronic system, structural system and control computer. After the target light passes through the front optical system, it is imaged on the primary image plane. A high-precision filter wheel is placed on the primary image plane. The wheel is used to switch the filters of different bands to achieve spectral acquisition. Finally, it is imaged on the focal plane of the long-wave infrared detector through the rear optical system. Among them, the optical system consists of two groups of coaxial spherical lens groups, namely, the front mirror group and the rear imaging mirror group. The structural system is the supporting structure of optical elements. The main function of the electronics system is to control the rotation of the runner and provide synchronous signals for the runner and the detector core. The functions of the electronic computer include data acquisition, image display, processing, work control, etc. According to the system indexes requirements, the optical system optical path design, distortion and MTF analysis are carried out in this paper. The electronic system synchronously controls the wheel for triggering and data acquisition. At the same time, the long-wave infrared spectral data processing software is developed to realize the reading, viewing and display of spectral image data and dynamic data viewing. Finally, the feasibility of the system function is verified by the spectral image data acquisition test of the designated scene and the UAV cooperation target. This system scheme would provide technical support for the spectral characteristics detection of military target in long-wave infrared band.
In the field of conventional weapon test and identification, optical measurement is often used to measure the exterior ballistic parameters of targets. With the variety of measuring equipment and measuring bands such as visible light/medium-wave/long-wave, the profile/shape and radiation/luminance distribution of the exhaust plume target imaging in the optical measurement system are great different, so that the target interpretation position changes greatly with the change of the exhaust plume .The variation of the plume depends on the flight state of the weapon system, inmost cases there is no prior data support, we judge by the experience of the surveyors, so this processing mode affects the credibility of the measurement data, especially in the case of high precision requirements such as characteristic parameter and miss distance processing. Aiming at the Consistency problem of multispectral imaging data of the exhaust plume target, using the inversion imaging method of fluid numerical simulation to characterize the multispectral imaging of the weapon system under various flight states, and theoretically evaluate the imaging deviation. Whether this method is feasible depends on accuracy of the wake simulation calculation meets the actual needs. For this reason, the wake combustion products and their components of a certain type of rocket are studied. Based on the plume component analysis, establish a plume directional radiation calculation model. Through the close acquisition of the visible light/ medium-wave/long-wave images in the initial stage of the rocket, the profile characteristic parameters are compared with the simulated radiation images obtained by numerical simulation. The results show that ,the main body of the exhaust plume edge error is located within ± 20%, and the comparison result in the core area of the exhaust plume is better than ±10%,so the profile data of the core area can be used as the reference for consistency analysis. This method breaks through the current situation of systematic error estimation based on experience in theory, and has high guiding significance for the evaluation of the processing accuracy of external ballistic test data.
Under the condition of information war, combat equipment is faced with the serious threat of "discovery is destruction". In the all-weather and all-day reconnaissance environment, the infrared spectrum characteristics of the target and its effective control become the key to change detectability and improve survivability.In view of the important value of infrared spectrum characteristics in battle, this paper carries out data collection and comprehensive processing of MWIR spectrum in equipment testing. Firstly, combining with typical task process, a data collection method is established, which forms a theoretical analysis, atmospheric transmission, data collection, radiometric calibration model. Then, the radiation data processing research is carried out. Taking the digital image as the original data, the radiation emittance is obtained by radiation calibration. Based on the transmittance and radiation model, the calculation method of apparent temperature is established. To verify the method proposed in this paper, combined with helicopter infrared image data, the distribution of MWIR radiation field and temperature field of the equipment during takeoff, landing and dynamic flight is obtained, reaching 5% calibration measurement accuracy.The feasibility and validity of the method are verified.In this paper, the collection and processing of infrared spectrum characteristics is a useful exploration to improve the quality and efficiency of equipment inspection capability. It has practical value for improving equipment data and fully characterizing equipment capability in the actual environment.
With the development of infrared technology, the cost of detector is decreasing and the application of staring imaging is becoming more and more extensive, which promotes the improvement of the antimissile warning level of the weapon platform. In the paper, a method for the antitank missile warning and precise recognition is presented based on the infrared characteristics of missile exhaust plume and the motion features of ballistic target. Firstly, the current status of missle warning technology is summarized. A hemispherical infrared staring detector of actual application is designed for ground weapon platform. The key technical indicators are given, and the technical routine of point target imaging warning is illustrated. Based on the above warning devices and typical observation scenarios, the relationship between target infrared radiation, observation distance and motion velocity is established, and a detection warning model is established. Combining with the actual application scene, the infrared warning distance window optimization, velocity calculation precision and point target recognition threshold are synthetically verified, and the analysis and quantification of critical data are gived. It showes that in typical scene detection and warning, the modeling of infrared characteristics and motion features can effectively achieve the antitank missile warning; under the control of observation conditions, the uncertainty of infrared radiation and motion velocity are less than 10%, which can be used to precise recognition the target under threshold of 30%.
KEYWORDS: High speed cameras, Data modeling, Video coding, Copper, Image segmentation, Target detection, Data acquisition, Video, RGB color model, Video surveillance
With the wide use of high speed cameras, the use of high frame frequency images and fast playback has become an important way to study the key events. In view of the problem of key frame retrieval and recognition and large capacity data remote transmission in fast playback, this paper proposes a technology of using Gauss background modeling and image super compression to achieve the fast playback reality of moving objects. Firstly, the imaging characteristics and background environmental characteristics of moving targets are analyzed, the steps of online modeling of mixed Gauss background are designed, and the implementation process and typical parameters are given. According to the target motion process, a playback script is customized, and the data volume and communication bandwidth of the high speed camera are calculated, a super compression ratio compression model based on transmission time, bandwidth and data volume is established. Combined with the method of application implementation, the modular block diagram and technical flow of replay processing are designed, and the basic relationship between the input and output parameters is clarified. The actual image sequence shows that in a typical target, equipment and network environment, using this technology can automatically identify key segment image sequences, realize image transmission and playback section can accurately judge the reality, for key events and provide effective technical support.
The use of infrared sensors to detect and obtain the real image of the moving target is an important means for the test of weapon equipment and the monitoring of space launch. To better play the advantages of infrared devices visibility at day and night, the role of distance, solved the details of the image display effect by eye gray resolution constraints problem for ground multisensor surveillance system field situation awareness requirements, proposed color visible image and infrared image registration and image processing based on color transfer and contrast equalization enhancement method. First, analyzed the implementation of dynamic monitoring system based on ground live monitoring system, through the acquisition of color image and infrared image, and multi frame color images combining to construct the scene, established the acquisition, processing, application process of the visible-infrared image registration; Then, analyzed the representation of color transfer process of color space and the features of real-time processing, will color scene graph expressed as geometry, color space, comprehensive expression of brightness distribution, According to the correspondence between the infrared image and the color scene image, obtained the color space representation of the infrared image; Next, Improved the infrared image gray distribution by contrast equalization method, by contrast limited adaptive histogram equalization to improve the display effect of gray details. As for the validation of the proposed method, using the method in the paper to enhance the infrared image, the experimental results show that the integrated color transfer and contrast balance, improved the visual effect of image display and showed more details information, Presented more detailed information, improved the image display effect.
Image quality is an important factor that influences the dynamic target information perception; it is the key factor of real-time target state analysis and judgment. In order to solve the multi-observation station comparison and video optimum seeking problem in the process of target information perception and recognition, an image quality assessment method based on visual characteristics is proposed for infrared target tracking. First, it analyses the basic infrared target image characteristics and application requirements, analyses the status and problems of the multi station optimum seeking technology. According to the expected research results, the processing flow of image processing is established. Then, the image quality objective assessment index is established, which reflects the basic characteristics of the target image, and the assessment index is integrated into the normalized assessment function. According to the quality assessment function, the infrared image quality assessment based on infrared target recognition and image analysis processing is realized, which is mainly characterized by the region of interest and dynamic visual characteristics. And on the basis of this technology, the real-time optimum seeking of multi station infrared target tracking image is completed. In order to verify the effectiveness of the method and the practical application effect, it designs the quality assessment and comparison of different station infrared images. Example shows that the method proposed in this paper can realize multi-observation station infrared image assessment comparison, image quality sorting, the optimum seeking of the infrared image based on the quality assessment. The results accord with the characteristics of infrared target image and dynamic visual characteristics.
High precision time control in the use of weapons and equipment is an important part of product design and development. In order to satisfy the data acquisition requirement of high accuracy and reliability in the rapid flight process, the super-resolution time measurement method based on target dynamic characteristics was put forward and proved by the cabin opening time measurement experiment. First, the changes of explosion pressure wave and image in the cabin opening process were analyzed in detail. The change regulation of explosion flame shape was analyzed by the characteristics of typical pressure wave, and then the high frequency images of the explosion process were shot by high speed camera. The change regulation of the infrared image was obtained through the comparison of visible and infrared image mechanism. Then, combined with the target motion features, and the observed station parameters, the observation model of movement process was built. On the basis of the above research, the infrared characteristic and the movement characteristic were transformed, and the super resolution model was established. For test method, combined with the actual class time measuring process in experimental design, to obtain the special radar for measuring high precision open class time as the true value of the precision appraisal. Experimental results show that the infrared feature and motion feature can realize open class time super resolution measurement, can effectively improve the accuracy and reliability of the data, to achieve specific action of high accuracy measurement that plays an important role by making use of the target dynamic characteristics.
Haze, fog, and smoke are turbid medium in the atmosphere which usually degrade viewing condition of outdoor scenes. The resulted images lose contrast and color fidelity with serious degradation. Due to loss of large detailed information of measured scene, it will usually lead to invalid detection and measurement. The suspended particles in the atmosphere and the scene being measured give rise to polarization changes by their reflection. In the process of reflection, absorption and scattering, the object itself can be determined by its own polarization characteristics. Based on this point, we proposed an approach for target vision through haze. This approach is based on the polarization differences between the scene being measured and the scattering background to move the haze effects. It can realize a great visibility enhancement and enable the scene rendering even if imaged under restricted viewing conditions with low polarization. In this work, the detailed theoretical operation principle is presented. A validating imaging system is established and the corresponding experiment is carried out. We present the experimental results of haze-free image of scene with recovered high contrast. This method also can be used to effectively enhance the imaging performance of any other optical system.
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