A Method for Testing Distortion of an Infrared Imaging System
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摘要: 红外成像系统图像畸变控制的良好与否对其能否在应用平台上发挥应有作用极为关键，因此在实验室内对红外成像系统的图像畸变进行测试、分析是极其必要的，本文提出了一种结合质心亚像素识别和精密测角的局部畸变测试方法，读取点靶在各个局部视场的质心变化并进一步计算即可得到畸变。采用该方法可以较好地解决点列质心法测试大视场系统操作性不高以及局部畸变法定位不够精确的问题，采用本方法对某型号红外成像系统进行了局部畸变测试，取得了与理论较为相符的测试结果，其相对畸变测试误差不超过0.02%，可以很好地满足红外成像系统的畸变测试需求，并对成像系统性能进行评估，有效反馈图像畸变对红外成像系统探测能力的影响。Abstract: It is necessary to test and analyze the distortion of an infrared imaging system in a laboratory because the ability of the system to play a role on the platform is dependent on the distortion control of an infrared imaging system. We have proposed a method based on a test of sub-pixel precision and precise angle measurement to calculate distortion using centroid difference data. It is laborious to test the distortion of an infrared system with a large field of view using a method which requires the computation of a large number of coordinates of points. Furthermore, the location of the field view could be a problem for the partial distortion method. By using the proposed method, the aforementioned problems can be addressed. We applied the method to evaluate a thermal system and the results were in agreement with those of the simulation software. The error control was less than 0.02%, which can meet the requirement. Moreover, the performance of the system was evaluated to analyze how the distortion affects the ability of the system.
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Key words:
- distortion /
- infrared imaging system /
- centroid
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表 1 局部视场对应角度
Table 1. Angle values of the field views
A B C A1 A2 A3 A4 B1 B2 B3 B4 C1 C2 C3 C4 X -27'27" 27'27" -27'27" 27'27" -45'45" 45'45" -45'45" 45'45" -1°4'3" 1°4'3" -1°4'3" 1°4'3" Y 20'15" 20'15" -20'15" -20'15" 33'45" 33'45" -33'45" -33'45" 47'15" 47'15" -47'15" -47'15" 
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表 2 畸变测试误差
Table 2. Test error of distortion
Part field views Test error of distortion Field view 1 0.014% Field view 2 0.014% Field view 3 0.014%
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