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High-accuracy scheme based on a look-up table for motion detection in an optical camera communication system
Optics Express ( IF 3.8 ) Pub Date : 2020-03-24 , DOI: 10.1364/oe.389107
Jing He , Zheng Huang , Ke Yu

In this paper, a high-accuracy motion detection (MD) scheme based on a look-up table (LUT) is proposed and experimentally demonstrated in an optical camera communication (OCC) system. The LUT consists of predefined motions and strings that represent the predefined motions. The predefined motions include straight lines, polylines, circles, and number shapes. At the transmitter, the data with on-off keying (OOK) format is modulated on an 8×8 light-emitting diode (LED) array. The motion is generated by the user’s finger in the free space link. At the receiver, the motion and data are captured by the mobile phone front camera. The captured motion is expressed as a string indicating directions of motion, then it is matched as a predefined motion in LUT by calculating the Levenshtein distance (LD) and modified Jaccard coefficient (MJC). Using the proposed scheme, four types of motions are recognized accurately and data transmission is achieved simultaneously. Also, 1760 motion samples from 4 users are investigated over the free space transmission. The experimental results show that the accuracy of the proposed MD scheme can reach 98% at the distance without the loss of finger centroids. In addition, as the transmitter is not blocked, the bit error rate (BER) is below 1e-6 at the distance of 80cm.

中文翻译:

基于查找表的高精度方案,用于光学照相机通信系统中的运动检测

本文提出了一种基于查找表(LUT)的高精度运动检测(MD)方案,并在光学相机通信(OCC)系统中进行了实验证明。LUT由预定义的运动和代表预定义的运动的字符串组成。预定义的运动包括直线,折线,圆形和数字形状。在发送器上,具有开关键控(OOK)格式的数据在8×8发光二极管(LED)阵列上进行调制。该运动由用户的手指在自由空间链接中生成。在接收器处,运动和数据由手机前置摄像头捕获。捕获的运动表示为指示运动方向的字符串,然后通过计算Levenshtein距离(LD)和修改的Jaccard系数(MJC)将其匹配为LUT中的预定义运动。使用提出的方案,可以准确地识别四种类型的运动,并同时实现数据传输。此外,还通过自由空间传输对来自4个用户的1760个运动样本进行了调查。实验结果表明,所提出的MD方案在不损失手指质心的情况下,在距离上的精度可以达到98%。此外,由于没有阻塞发送器,所以在80cm的距离处,误码率(BER)低于1e-6。
更新日期:2020-03-31
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