可见光谱光学隐蔽信道在商用智能照明中的应用

中文摘要 AI 辅助

智能发光二极管（LED）灯泡是能够产生携带信息输出的联网设备。本研究探讨这种光能否通过足够微小、使房间内人员难以察觉的变化来携带数字数据。为探索这一隐蔽通信信道，我们使用一个未经修改的智能灯泡（Philips WiZ A19），并以相机作为接收端进行测试。二进制数据通过编程方式编码在几乎匹配的颜色和亮度变化中。由于这些差异在1600万种颜色步进中被刻意设置得很小，接收端周期性地测量已知参考状态，并利用这些状态来补偿相机和背景室内光照的变化。颜色方法成功传输了短消息“hi”，使用的色差（E）为0.5，这是感知颜色距离的标准度量。接收端恢复了99%的传输比特，完整消息通过了完整性检查。亮度方法在测试的最小非零整数差异下仍可解码，即在调光设置56和54之间交替，两次运行的平均比特准确率为96.2%。在对照实验中，当两个二进制符号被分配到相同亮度时，准确率降至接近随机水平。这些结果表明，普通智能灯泡的可见输出可以在无需硬件修改的情况下作为低速率数据信道。相机的颜色漂移可能淹没小信号，除非在传输过程中对接收端进行重新校准；环境光的突然变化可能干扰解码；更长的消息需要更强的纠错。颜色实验在低于人类颜色辨别常规阈值的差异下运行。亮度方法对应的感知极限尚未通过实验确定。

英文摘要

Smart light-emitting diode (LED) bulbs are networked devices that produce information-carrying output. This study asks whether that light can carry digital data through changes small enough to be difficult for a person in the room to notice. To explore this covert communication channel, we tested an unmodified smart bulb (Philips WiZ A19) using a camera as the receiver. Binary data were encoded programmatically in nearly matched color and brightness changes. Because the differences were deliberately small across 16 million color steps, the receiver periodically measured known reference states and used them to compensate for changes in the camera and background room illumination. The color method successfully transmitted the short message 'hi' using a color difference (E) of 0.5, a standard measure of perceptual color distance. The receiver recovered 99% of the transmitted bits, and the complete message passed an integrity check. The brightness method remained decodable at the smallest nonzero integer difference tested, alternating between dimming settings 56 and 54, with 96.2% mean bit accuracy across two runs. When both binary symbols were assigned to the same brightness in a control experiment, accuracy fell to approximately chance. These results show that the visible output of an ordinary smart bulb can serve as a low-rate data channel without hardware modification. Camera color drift can overwhelm small signals unless the receiver is recalibrated during transmission, sudden changes in ambient light can disrupt decoding, and longer messages require stronger error correction. The color experiment operated at a difference below a conventional threshold for human color discrimination. The corresponding perceptual limit for the brightness method has not yet been established experimentally.

发表机构

• PeopleTec, Inc.（PeopleTec公司）

机构由 AI 辅助整理，请以论文原文为准。