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为满足红外瞄具零位走动量数字化、高精度的检测需求,设计了基于电荷耦合器件(CCD)机器视觉技术的红外瞄具零位走动量检测系统。提出一种新的零位走动量检测模型,依据检测系统的技术指标及要求,设计了离轴抛物面反射式准直光学系统及针孔靶。为减小由相机倾斜引入的测量误差,建立了相机姿态自适应校正模型,并首次将其应用于零位走动量测量中。设计了图像判读软件,采用重心法对靶标中的圆斑中心进行定位,利用泽尼克矩的旋转不变性,对边缘像素点进行细分。成功研制了一台样机,加工装调后进行了测试实验,结果表明,系统的不确定度优于0.02mil,能有效避免由相机倾斜引入的测量误差,满足红外瞄具零位走动量数字化、高精度测试要求。
In order to meet the digitized and high-precision detection requirements of the zero wander of infrared sight, a CCD-based zero-wander wander detection system based on CCD (Charge Coupled Device) vision technology was designed. A new model for detecting zero-point walking is proposed. According to the technical specifications and requirements of the inspection system, an off-axis parabolic reflective collimation optical system and a pinhole target are designed. In order to reduce the measurement error introduced by the camera tilt, an adaptive camera attitude correction model was established and applied to zero-position walk-in measurement for the first time. The image interpretation software is designed. The centroid method is used to locate the center of the circular spot in the target, and the edge pixels are subdivided according to the rotation invariance of the Zernike moment. The successful development of a prototype, processing and installation of the test carried out after the test results show that the system uncertainty is better than 0.02mil, can effectively avoid the camera tilt measurement error introduced to meet the infrared sight zero mobile amount of digital, High-precision test requirements.