基于STM32的激光投射虚拟键盘设计

Design of the laser projecting virtual keyboard based on STM32

针对虚拟键盘设计中位置的误判导致识别精度低的问题,文章研究了虚拟键盘设计中的空间坐标采集技术,并提出采用手指反射的红外光来确定虚拟键盘的空间坐标。以STM32作为主处理器,其拥有的I/O口数量以及具备的高速工作频率,可以很好地支持摄像头对图像的采集和处理;使用激光进行键盘图案的投影,方法简单,不需要对其进行额外的程序操作;使用红外光进行按键的检测,相比采用空间坐标模块方案和双摄像头方案,更加简单、节约成本;使用摄像头进行图像的采集,将摄像头采集到的数据进行图像分析,从而实现其对手指的准确定位。采用本文所提出的虚拟键盘设计方法,可以实现可靠的文字编辑等操作。

In order to solve the problem of low recognition precision caused by misjudgment of position in virtual keyboard design,this paper studies the spatial coordinate acquisition technology in virtual keyboard design,and proposes to determine the spatial coordinates of virtual keyboard by using the infrared light reflected by fingers.In this paper,STM32 is used as the main processor.The number of I/O ports and the high-speed working frequency of STM32 can well support the camera to collect and process images.The method of using laser to project the keyboard pattern is simple and does not require extra program operation.Compared with the space coordinate module scheme and dual camera scheme,it is simpler and cheaper to use infrared light to detect buttons.The camera is used to collect images,and the data collected by the camera is analyzed,so as to realize the accurate positioning of fingers.By using the virtual keyboard design method proposed in this paper,reliable text editing and other operations can be realized.