Design Of Detection System For The Projectile Impacting Location In The Impact Precision Measurement Tests

With the rapid development of modern science technology, the recognition technology of bullet holes position is updated constantly, and a series of various hole position detection systems are developed. In the test of dispersion of projectiles impact locations, the manual measurement of the position of projectiles is not flexible, inefficient and inaccurate. Thus, in this paper, a bullet hole position detection system based on binocular vision measurement and image processing is designed, and can be used for the measurement of the impact locations of the bullet holes rapidly and accurately, and helps for the measurements of dispersion of projectiles impact locations and weapons tests.The main contents and contributions of this paper are as follows:1) The overall scheme of the bullet hole position detection system is designed. According to the technical requirements, the hardware part of the system is selected reasonably, and the testing principle of the system is analyzed and established.2) The system calibration method is studied, and the calibration principle of the dual camera is analyzed. According to the Zhang Zhengyou calibration method, the calibration method of the system is proposed, and the formula is deduced. At the same time, the algorithm for image corner extraction is studied and analyzed.3) The image processing methods for bullet image is researched, and the noise is removed by binaryzation, dilation, corrosion and other morphological filtering methods. Then the pixel coordinates information of the projectiles can be obtained by edge detection and centroid extraction.4) The software of the man-computer interface system is designed and implemented, and the image acquisition, system calibration, image processing, data integration, results reporting and the creation of other software window are completed successively based on the test requirements. This software improves the work efficiency of the system, and provides the possibility for the visual operation and humanized design.The position of the holes of simulated bullet and air gun are measured by the prototype system, and the results show that all the errors between the measurements coordinates and the actual coordinates are in the range of technical requirements. The system overcomes the low efficiency, low accuracy, poor reliability and security problems of manual measurement, and avoids the influence of human factors, thus the efficiency is improved greatly. Therefore, it has important significance to improve the testing level of shooting range.