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The application of laser triangulation method on the blind guidance

机译:激光三角剖分法在盲导中的应用

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A new apparatus for blind-guide is proposed in this paper. Optical triangulation method was used to realize the system. The main components comprise a notebook computer, a camera and two laser modules. One laser module emits a light line beam on the vertical axis. Another laser module emits a light line beam on the tilt horizontal axis. The track of the light line beam on the ground or on the object is captured by the camera, and the image is sent to the notebook computer for calculation. The system can calculate the object width and the distance between the object and the blind in terms of the light line positions on the image. Based on the experiment, the distance between the test object and the blind can be measured with a standard deviation of less than 3% within the range of 60 to 150 cm. The test object width can be measured with a standard deviation of less than 1% within the range of 60 to 150 cm. For saving the power consumption, the laser modules are switched on/off with a trigger pulse. And for reducing the complex computation, the two laser modules are switched on alternately. Besides this, a band pass filter is used to filter out the signal except the specific laser light, which can increase the signal to noise ratio.
机译:本文提出了一种新型的盲导装置。采用光学三角剖分的方法来实现该系统。主要组件包括一台笔记本电脑,一台照相机和两个激光模块。一个激光模块在垂直轴上发射光束。另一个激光模块在倾斜水平轴上发射光束。相机捕获地面或物体上的光束的轨迹,并将图像发送到笔记本计算机进行计算。该系统可以根据图像上的直线位置来计算物体的宽度以及物体与百叶窗之间的距离。根据实验,可以在60至150 cm的范围内以小于3%的标准偏差测量被测物体与百叶窗之间的距离。可以在60至150厘米范围内以小于1%的标准偏差测量被测物体的宽度。为了节省功耗,通过触发脉冲打开/关闭激光模块。为了减少复杂的计算,两个激光模块交替打开。除此之外,带通滤波器用于滤除特定激光之外的信号,这可以增加信噪比。

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