Research On Key Techology Of Closed Loop Special Scene Simulation With High Frame Frequency

During the development process of EO imaging tracking system, the designscheme is necessary to be kept on verifying, optimizing, evaluating and testing.However, there are many difficulties in the full range of testing, including theacquisition of scene data source. Outfield experiment is the most effective way to getreal scene data, but it is too costly for time after time experiments while theenvironmental condition is out of control and also can't be strictly repeated. Thepractical application environment and motion state of the targets such as plane, tankand ship, are complicated, so that it is impossible to test the system performanceunder all possible environmental conditions. Otherwise, solely relying on outfieldexperiment also comes no good for carrying out the various testing works in thedevelopment stage. Therefore, it is absolutely necessary to develop closed loopspecial scene simulation system with high frequency reasonable making use ofsimulation tools and equipments, which can simulate actual outfield applicationenvironment, provide scene data that is same or similar to the actual applicationenvironment and output data stream in accord with actual EO imaging system in orderto fully test and evaluate the work performance of the EO imaging tracking system inthe actual combat environment. The successful development of the system offer aneffective mean for testing the working efficiency of the information processor algorithm under actual combat qualitatively and quantitatively, so as to fully evaluatethe performance indexes and that has great significance and potential applications.The scene generator is the key equipment of the hardware closed loop simulationof EO imaging guidance system. In the paper, the graphics and image processingtechnology are combined with hardware simulation technology for dynamic scenesimulation system development. Through the collaboration of high-performancecomputer and peripheral hardware device, dynamic scenes, which simulatesmulti-DOF motion of different targets under various background and interferenceconditions are generated and directly injected into the guiding information processorof the seeker for testing the performance of the algorithm of information processor.First, the target extraction method proposed in the paper, which combines the imagepretreatment, image segmentation with multi-scale morphological processing, is usedto extract the real target from actual photographic image including martial target toform individual target image with black background. Actual photographic imagesunder different environment condition are directly used as the background of thesimulation scenes. Secondly, the simulation motion track is set and the location, scaleand motion attitude of the target in the imaging plane are adjusted according to thecalculated motion parameter using correlative graphic transformation algorithm.Again, realistic image synthesis is completed by three steps, including noiseprocessing, intensity matching and edge smoothing. To enhance the photorealism ofsynthetic image, the point spread processing is introduced to simulate the differenttype of blurring effects caused by relative motion between camera and target duringflight according to the setting camera parameter and scene motion parameter value.Otherwise, by the way of adjusting the brightness, contrast, and SNR of the image, thebackground and target signal intensity can achieve simulation controllable. Finally,the dynamic variation of scene during the whole tracking process is simulatedaccording to the control model and set simulation parameter and has realized closedloop simulation and accurate scene sequencing. While the sequence scenes are to sendout, various type of sensor effect are superposed in real time and finally achievegenerating image stream with arbitrary resolution, multi-frame rate and different type. At present, the simulation system is successfully applied to the total indexes testingfor ATR algorithm of guiding information processor. It is proved that the system isable to generate high fidelity scene data and realize closed loop scene simulation bythe way of digital signal injection. The closed loop simulation system can output datastream up to1280*1024@500fps or2048*2048@100fps, and that has met with theneed of the real-time image processing system for high frame frequency and largecapacity data source.