基于可见光源与独立成分分析法的实时人眼检测系统

提出一种基于特征与外貌混合检测确定人眼区域的实时人眼检测方法.首先,依据可见光源在人眼角膜上反射形成耀点特性,通过图像处理算法提取潜在耀点位置,利用人眼几何特征的确定可能人眼候补区域;然后,提取人眼数据库中具有不同外貌特征的200幅人眼图像,采用FastICA算法估计出提取人眼图像的有效成分分析(ICA)基向量;最后,通过计算人眼候选区域在基向量上投影角度判断出左、右人眼区域准确位置.实验结果表明,在人脸面部旋转、佩戴眼镜、大范围头部运动和不同光照强度下,实时人眼检测具有较高的检测正确率和较好的鲁棒性.

基于单片机的可见光室内定位系统设计

室内定位技术作为室外定位技术的延展,近年来室内定位技术用处愈加明显。设计了一套应用于室内的可见光定位系统,采用广角镜头的摄像头作为传感器,摄像头对空间顶部的光信息进行采集并处理,采用STC15F2K60S2单片机作为传感器及测量电路的处理器,采用msp430单片机作为LED控制电路的处理器,通过传感器自身的坐标和灯光信息的数据拟合准确得到自身位置。实验结果表明:通过采用广角摄像头作为传感器来定位,系统结构更简单,可以使室内定位应用更加广泛。

Free-Space Optical communication using visible light

The possibility of visible red light laser being used as signal light source for Free-Space Optical (FSO) communication is proposed. Based on analysis of transmission in atmospheric channel concerning 650 nm laser beam, performance of wireless laser communication link utilizing a low power red laser diode was evaluated. The proposed system can achieve a maximum range of 300 m at data rate 100 Mb/s theoretically. An experimental short-range link at data rate 10 Mb/s covering 300 m has been implemented in our university. It is feasible to enhance the system performance such as link range and data rate by increasing transmitting power and decreasing laser beam divergence angle or through other approaches.