研究目的
To demonstrate a visible light receiver using a rolling-shutter smartphone camera for light-to-camera communications, addressing practical problems and evaluating factors like LED colors and angles to enhance system performance.
研究成果
The LTC prototype successfully demonstrates visible light communication using smartphone cameras, with evaluations showing white LEDs perform best and angles up to 90 degrees are feasible. It offers a low-cost alternative to QR codes but requires improvements in data rate and error handling for broader applications.
研究不足
The system has low data rates due to smartphone camera frame rates, no error-correction coding leading to packet drops and delays, and requires manual configuration of camera parameters. It is sensitive to noise and limited by LED power and colors.
1：Experimental Design and Method Selection:
The system is designed with a transmitter using Arduino Genuino for OOK modulation and a receiver using an Android app with CMOS image sensor. It leverages rolling-shutter effects for decoding light signals.
2：Sample Selection and Data Sources:
LED lights (e.g., Cree CXA 2520) are used as transmitters; smartphones (e.g., Nexus 6, Blackberry PRIV) serve as receivers. Data consists of ID messages transmitted via light signals.
3：List of Experimental Equipment and Materials:
Arduino Genuino board, high-current LEDs (Cree CXA 2520), power MOSFET (STF5N52K3), gate driver (MAX4427), smartphones with cameras, OpenCV library for image processing.
4：Experimental Procedures and Operational Workflow:
Transmitter modulates IDs to frequencies (e.g., 2000 Hz for preamble), sends via LEDs. Receiver captures frames, processes images (grayscale conversion, edge detection), estimates strip widths, decodes frequencies to extract IDs, and displays promotional images via Wi-Fi.
5：Data Analysis Methods:
Strip width estimation using pixel counting and YIN algorithm for frequency calculation; statistical evaluation of successful packet reception rates for different LED colors and angles.
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