单镜头大视场拼接系统成像分析与控制设计

为了满足远距离目标捕获的需求, 提出了一种单镜头大视场拼接成像方法, 设计了实验样机对其进行验证, 对样机的成像特性进行了分析。介绍了样机的结构设计和相机曝光控制流程, 然后根据该成像方法通过控制相机连续圆锥旋转实现大视场成像的特点, 分析了样机成像的像移特性及样机结构运动精度对子图像正确拼接的影响, 最后设计了在样机运转过程中使相机准确对子视场曝光的控制参数。实验中将样机参数代入分析结果进行了计算, 得出了成像的像移大小, 并对由相机运动误差导致的子图像拼接偏差进行了校核。计算得出了相机的曝光控制参数, 最终获得了拼接正确的大视场图像。通过对实验样机的成像特点进行分析, 为该单镜头大视场拼接方法在激光对抗系统中的工程应用奠定了基础。

Abstract

A large field of view stitching method with a single lens was proposed to meet the requirement of remote target capture. An experimental prototype was designed to verify the method, and the imaging characteristics of the prototype were analyzed. The structural design of the prototype and the camera exposure control process were introduced. Then according to the imaging method, by controlling the continuous conic rotation of the camera to realize large-field imaging, the image motion feather of the prototype and the influence of the motion tolerance on the correct splicing of the sub-images were analyzed. At last the control parameters were designed to make the camera expose to the proper field when the prototype was in running. In the experiment, the parameters of the prototype were substituted into the analysis results, the image motion value was obtained by calculation, and the stitching deviation of the sub-images caused by the camera motion error was checked. Finally the large field image that was stitched correctly was obtained according to the camera exposure control parameters obtained by calculation. The imaging characteristics of the experimental prototype were analyzed, which laid the foundation for engineering application of the large-field stitching method.

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张祥, 高云国. 单镜头大视场拼接系统成像分析与控制设计[J]. 红外与激光工程, 2019, 48(1): 0118001. Zhang Xiang, Gao Yunguo. Imaging analysis and control design of large field of view stitching system with a single lens[J]. Infrared and Laser Engineering, 2019, 48(1): 0118001.

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