Baczkowski L S, Enderle J D, Engelken E J
Department of Electrical & Electronics Engineering, North Dakota University, Fargo 58105.
Biomed Sci Instrum. 1991;27:145-52.
A less expensive instrumentation alternative to record horizontal eye movements is presented in the form of a feasibility study. Currently, there are several techniques used to accurately measure eye position for research purposes. To implement these techniques, significant financial resources are required. The proposed technique costs less than $3000.00 and is based upon the limbus position technique. A linear charged coupled device (CCD) image array sensor and a biconvex lens are used to determine the position of the pupil. The self scanned CCD array is controlled by four analog clock signals generated from digital logic. The CCD video output signal is converted to a TTL compatible signal. The TTL signal is used to create a digital number based upon the limbus image formation upon the CCD pixels. This digital number is processed using standard signal acquisition techniques and is recorded on the hard drive disk of an IBM PC/AT compatible system. The C programming language is used to acquire the data and control calibration of the system. FORTRAN software is used to implement digital signal processing algorithms and estimate eye position.
一项可行性研究提出了一种成本较低的用于记录水平眼动的仪器设备替代方案。目前，有几种用于研究目的精确测量眼位的技术。要实施这些技术，需要大量资金。所提出的技术成本低于3000.00美元，且基于角膜缘位置技术。使用线性电荷耦合器件（CCD）图像阵列传感器和双凸透镜来确定瞳孔位置。自扫描CCD阵列由数字逻辑产生的四个模拟时钟信号控制。CCD视频输出信号被转换为与TTL兼容的信号。该TTL信号用于基于CCD像素上的角膜缘图像形成创建一个数字量。这个数字量使用标准信号采集技术进行处理，并记录在IBM PC/AT兼容系统的硬盘上。使用C编程语言来采集数据并控制系统校准。使用FORTRAN软件来实现数字信号处理算法并估计眼位。
