使用手机摄像头且数据速率高于帧率的可见光通信。

Visible light communication using mobile-phone camera with data rate higher than frame rate.

作者信息

Chow Chi-Wai, Chen Chung-Yen, Chen Shih-Hao

出版信息

Opt Express. 2015 Oct 5;23(20):26080-5. doi: 10.1364/OE.23.026080.

DOI:10.1364/OE.23.026080

Abstract

Complementary Metal-Oxide-Semiconductor (CMOS) image sensors are widely used in mobile-phone and cameras. Hence, it is attractive if these image sensors can be used as the visible light communication (VLC) receivers (Rxs). However, using these CMOS image sensors are challenging. In this work, we propose and demonstrate a VLC link using mobile-phone camera with data rate higher than frame rate of the CMOS image sensor. We first discuss and analyze the features of using CMOS image sensor as VLC Rx, including the rolling shutter effect, overlapping of exposure time of each row of pixels, frame-to-frame processing time gap, and also the image sensor "blooming" effect. Then, we describe the procedure of synchronization and demodulation. This includes file format conversion, grayscale conversion, column matrix selection avoiding blooming, polynomial fitting for threshold location. Finally, the evaluation of bit-error-rate (BER) is performed satisfying the forward error correction (FEC) limit.

摘要

互补金属氧化物半导体（CMOS）图像传感器广泛应用于手机和相机中。因此，如果这些图像传感器能够用作可见光通信（VLC）接收器，将会很有吸引力。然而，使用这些CMOS图像传感器具有挑战性。在这项工作中，我们提出并演示了一种使用手机摄像头的VLC链路，其数据速率高于CMOS图像传感器的帧率。我们首先讨论并分析了将CMOS图像传感器用作VLC接收器的特性，包括卷帘快门效应、每行像素曝光时间的重叠、帧间处理时间间隔，以及图像传感器的“晕光”效应。然后，我们描述了同步和解调的过程。这包括文件格式转换、灰度转换、避免晕光的列矩阵选择、阈值位置的多项式拟合。最后，在满足前向纠错（FEC）限制的情况下进行误码率（BER）评估。