Based upon the direct position detection approach and pixel analysis technique, a CCD-based system has been developed for three-dimensional real-time positioning. A data sampling interface card has been designed to gather the 2D coordinates of the LED markers. The spatial positions of moving multiple spots can be obtained instantly. A calibration frame has been constructed to acquire the system parameters before detection. A modified DLT (Direct Linear Transformation) algorithm is presented to correct the nonlinear lens distortion using a planar spot-grid. The precision of the system is less than /spl plusmn/1 mm in a 500 mm/spl times/500 mm/spl times/500 mm space. This corresponds to a spatial resolution of about one part in 500 or 0.2% overall accuracy. This system has been applied in evaluating the therapeutic effect of Lumbar Spine Function in manipulative orthopedics. Some discussions about how to acquire more accurate results by modifying the system and the algorithm are also presented.
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机译:基于直接位置检测方法和像素分析技术,已经开发了用于三点实时定位的基于CCD的系统。数据采样接口卡已设计为收集LED标记的2D坐标。可以即时获得移动多个点的空间位置。构造了一个校准框架以在检测之前获取系统参数。提出了一种改进的DLT(直接线性变换)算法,以使用平面点栅格校正非线性透镜畸变。在500 mm / spl倍/ 500 mm / spl倍/ 500 mm的空间中,系统的精度小于/ spl plusmn / 1 mm。这相当于大约500或0.2%的整体精度中的空间分辨率。该系统已用于评估手足整形外科中腰椎功能的治疗效果。还提出了一些有关如何通过修改系统和算法来获得更准确结果的讨论。
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