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DaVid+ (DaVid-Light and DaVid-Share)


project description

Based on the DaViD-project, further display-camera communication systems with different prioritization are under development at the communication technology institute.

  • DaVid-Light:

    For many potential application scenarios – especially when using a smartphone with an internet connection as the receiver – high optical data rates are often not required. Instead, low latency, high reliability and compatibility are more important for broad application. With DaVid-Light, we realize a real time data transmission from display to smartphones, which is invisible for the viewer. The payload size is 328 Byte, which is sufficient for transmitting a URL. The transmission is reliable even at long transmitter-receiver distances and viewing angles, facilitating a wide spectrum of applications. The data modulation can be either performed live by a PC or it can be embedded into the footage in advance, which can then be played by any media player. On smartphone side, a receiver App is used to reconstruct the overlaid data from recorded images. The DaVid-Light system can be used to add extra content to digital public presentations of information or advertisement, whose URL can be easily downloaded with the user’s smartphone camera.

    The following video shows a transmission demo:


  • DaVid-Share:
    DaVid-Share has primarily beem designed to quickly share data optically between two mobile devices. Therefore, the display of one device acts as a transmitter and the camera of the other device as the receiver. The transmitting display is not parallelly used for image or video playback, but solely for data transmission. Consequently, the entire dynamic range of the three color channels (red, green and blue) can be exploited, while no differential modulation scheme is required. This further increases the achievable data rate compared to the DaVid system. For data transmission, the DaVid-Share app developed at our institute must be installed on both devices. The transmission process can be initiated via the share function of the smartphone:


The maximum achieved data rate from smartphone to smartphone is 5 Mbit/s so far. Besides the transmission from and to mobile devices, we also examine DaVid-Share on our conventional transmission setups (e.g. OLED-TV with high-end industrial camera). The application on a stationary screen might also be interesting, as long as the screen is not required for an parallel video playback. Due to the higher display refresh and camera recording rate and the better receiver camera (larger sensor, better optics), we already achieved a gross data rate of 69 Mbit/s.

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M.Sc. Christian Brauers
M.Sc. Johannes Klein
M.Sc. Jianshuang Xu
M.Sc. Jörn Jochims