基于图像的红外镜头焦距快速检测方法研究

Fast Focal Length Measurement Method based on Infrared Lens Images

摘要: 如何准确检测镜头的焦距是红外镜头参数检测的一项重要研究内容。本文提出了一种基于刀口靶图像的焦距快速检测方法。该方法先采集红外镜头聚焦状态下的刀口靶图像，再进行刀口靶图像的二值化处理；通过提取目标的边缘轮廓，获得最小外接矩形的顶点坐标信息，从而估算出红外镜头对应焦距。实验结果证实：该检测方法可快速、准确地测量出镜头的焦距，且测量的平均绝对误差百分比小于1.48。该方法为红外镜头重要参数的快速检测奠定基础。

Abstract: Accurately measuring the focal length of an infrared lens is a crucial issue in infrared lens parameter measurement. This paper proposes a practical focal length estimation method based on a target knife image. First, the target image is captured in the focused state and a binary image is obtained, then the edge of the target is extracted, the vertex coordinates of the minimum external rectangle are obtained, and the corresponding focal length of the infrared lens is estimated. Experimental results show that the algorithm can measure the focal length of the infrared lens quickly and accurately, and the average absolute error percentage is less than 1.48. This method lays the foundation for the rapid measurement of infrared lens parameters.