基于转台角度的远场图像快速校正方法研究
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摘要
在激光照射器性能监测系统中,针对靶板的运动特性、连续采集的目标靶板图像有不同程度畸变等情况,提出一种以转台相对角度作为畸变参量对连续远场图像进行畸变校正的方法:在建立世界坐标系和图像坐标系的前提下,利用一张参考图象选取的四个特征点及转台编码器提供的俯仰/方位角,建立远场图像畸变校正的数学模型,实现对连续远场图像的快速校正。通过测试数据表明,该畸变校正方法对运动过程中靶板的校正精度为0.3pixel,为激光照射性能监测系统后续计算提供了准确有效的远场图像。
In the performance monitoring system of the laser irradiator,a method for correcting the distortion of continuous far-field images by using the relative angle of the turret as a distortion parameter was proposed in view of the movement characteristics of the target plate and the distortion of the continuously acquired target image. With the introduction of the world coordinate system and the image coordinate system,the four feature points were selected in the reference image and the pitch/azimuth was provided by the turret encoder to establish a mathematical model for far field image distortion correction in this method. Fast correction of continuous far-field images was realized. The test data showed that this distortion correction method corrected the target board's correction accuracy to one pixel during the movement,which provided an accurate and effective far-field image for the subsequent calculation of the laser irradiation performance monitoring system.
In the performance monitoring system of the laser irradiator,a method for correcting the distortion of continuous far-field images by using the relative angle of the turret as a distortion parameter was proposed in view of the movement characteristics of the target plate and the distortion of the continuously acquired target image. With the introduction of the world coordinate system and the image coordinate system,the four feature points were selected in the reference image and the pitch/azimuth was provided by the turret encoder to establish a mathematical model for far field image distortion correction in this method. Fast correction of continuous far-field images was realized. The test data showed that this distortion correction method corrected the target board's correction accuracy to one pixel during the movement,which provided an accurate and effective far-field image for the subsequent calculation of the laser irradiation performance monitoring system.
引文
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[3]徐宏林,陈战旗,郭略,等.目标指示误差对激光制导武器命中精度的影响[J].弹箭与制导学报,2010,30(3):44-46.
[4]代勤,王延杰,韩广良.基于改进Hough变换和透视变换的透视图像矫正[J].液晶与显示,2012,27(4):552-556.
[5]曹天扬,申莉.基于图像透视畸变自动校正的仪表判读方法[J].计量技术,2016(2):24-27.
[6]王延海,王晓曼,李玉山,等.基于图像透视畸变校正的调炮速度测量方法[J].兵工学报,2016,37(8):1517-1523.
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[8]Fry J,Pusateri M.A system and method for auto-correction of first order lens distortion[C].Applied Imagery Pattern Recognition Workshop.IEEE,2010:1-4.
[9]郭永刚,葛庆平,冯平,等.一种基于控制点自动提取的图像畸变校正算法[J].计算机工程与应用,2007,43(2):214-216.
[10]尹梁波,邓兴升.基于BP神经网络的物镜畸变改正模型精度探讨[J].测绘科学技术,2018,6(2):79-84.
[11]王向军,白皓月,吴凡璐,等.基于改进球面透视投影的鱼眼图像畸变校正方法[J].图学学报,2018,39(1):43-49.