Chen Hao-Wei, Wen Shang-Sheng, Liu Yun, Fu Min, Weng Zi-Chun, Zhang Meng
Appl Opt. 2018 Jul 1;57(19):5288-5294. doi: 10.1364/AO.57.005288.
As mobile payments become increasingly popular, the security of the transaction process should be taken more seriously. Many mobile phones are equipped with complementary metal-oxide-semiconductor (CMOS) cameras, which can be used as visible light communication (VLC) receivers. An optical camera communication (OCC) system is a special VLC system that uses an optical camera as a receiver. OCC offers acceptable security, but challenges remain. In this paper, we propose an OCC system that uses an optical camera with a rolling shutter as a receiver and a light-emitting diode (LED) panel light as a transmitter. The feature of an LED panel light serving as a surface light source reduces the possibility of overexposure and avoids the blooming effect of the camera. The rolling shutter effect of the CMOS camera is used to increase the data rate, which is numerically much higher than the frame rate. Finally, the results of a symbol error rate (SER) test show that the VLC system exhibits error-free performance. The data rate is approximately 4.2 kb/s, while the net data rate is approximately 2.46 kb/s due to the redundancy of the 3-9 code bar code and the redundant cycle. This data rate is sufficient for mobile payments, which require only 60 bits of data at a time.
随着移动支付越来越普及，交易过程的安全性应得到更认真的对待。许多手机都配备了互补金属氧化物半导体（CMOS）摄像头，这些摄像头可用作可见光通信（VLC）接收器。光学摄像头通信（OCC）系统是一种特殊的VLC系统，它使用光学摄像头作为接收器。OCC提供了可接受的安全性，但挑战依然存在。在本文中，我们提出了一种OCC系统，该系统使用具有卷帘快门的光学摄像头作为接收器，发光二极管（LED）平板灯作为发射器。用作面光源的LED平板灯的特性降低了过曝光可能性，并避免了摄像头的光晕效应。CMOS摄像头的卷帘快门效应用于提高数据速率，其在数值上远高于帧率。最后，符号错误率（SER）测试结果表明，该VLC系统具有无差错性能。数据速率约为4.2 kb/s，由于3-9码条形码和冗余周期的冗余，净数据速率约为2.46 kb/s。这个数据速率对于每次仅需60位数据的移动支付来说足够了。
