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为了精准且快速的检测红外透镜的性能,设计了一套基于图像处理的快速红外CCD自动调焦测量系统,采用波长范围为3.7~4.8μm的中波制冷红外CCD相机,对透过红外镜头产生的像自动聚焦进行二次成像,通过图像的快速处理和分析,以检测镜头对称性和焦距等性能。重点分析了目前常用的自动对焦技术,针对该检测系统提出了灰度熵与统计学函数有机结合的自动聚焦方法,并通过大量的检测结果进行验证。实验结果表明系统重复定位的位置精度达到10μm。
In order to accurately and quickly detect the performance of infrared lens, a set of fast infrared CCD automatic focusing measurement system based on image processing is designed. The infrared CCD camera with the wavelength of 3.7 ~ 4.8μm is used to detect the infrared lens. Like autofocus for secondary imaging, through the rapid processing and analysis of images to detect lens symmetry and focal length and other performance. Focusing on the commonly used autofocus technology, an automatic focusing method combining the gray entropy and the statistical function is put forward for the detection system, and a lot of test results are used to verify the method. The experimental results show that the position accuracy of system repeat positioning reaches 10μm.