基于双目视觉的飞行头盔动载特性测试技术研究

Research on Dynamic Load Characteristics Test Technique for Flight Helmet  Based on Binocular Vision[HS)]

摘要:

为了测试飞行员综合显示头盔系统在动态载荷下的穿戴运动特性和人机工效性,针对头盔与头部相对运动状态难以量化测量的问题,提出了一种基于双目视觉的测量方法,并研制了相应的测试系统；测试前,对两台摄像机分别进行标定以获取其内外参数,在施加动态载荷的测试过程中,通过摄像机提取被测目标事先编码的标记点,利用图像处理软件对其定位和立体匹配,确定标记点的坐标值及相互关系,调用OpenCV中的cvPOIST函数解算目标位置及三维姿态,实现了头盔与头部模型三维相对位移、角度和角速度参数的精确测量,试验结果表明,这种非接触式的测量方法真实还原了动态过载过程中头盔与头模的相对运动过程,具有不改变试验对象的质量特性、不干扰试验对象运动状态的优点,具有较高的应用价值。

Abstract:

The paper proposed a measurement method based on binocular vision meanwhile developed a testing system to examine the dynamic performance and ergonomics of helmet mounted display system, which could solve the problem that it is difficult to measure the relative movement between helmet and head quantitatively. Two cameras were standardized to have their internal and external parameters obtained before test. During test process, pre-encoded sign points were extracted by those two cameras, followed by locating and matching with image processing software to provide coordinate value and relative relationship. The function cvPOIST in OpenCV was used to calculate the locations and three-dimensional attitudes of the object. In this way, key parameters, relative three-dimensional displacement, angles and angular velocity, were measured accurately. Results of the test suggested that this non-contact measurement method could restore the relative movement between helmet and head model, it also has the advantages that do not change the quality characteristics as well as not affect the movement status of the test object, making it competitive in applications.