Single channel light communication for vehicle registration

A method, comprising:

• receiving a video stream comprising a plurality of video frames continuous in time;
• converting the video stream to a binary string comprising a plurality of binary bits each corresponding to a respective one of the plurality of video frames, the binary string containing a repeated binary pattern representing a message;
• extracting the binary pattern from the binary string, wherein the extracting of the binary pattern comprises:
• transforming the binary string from a time-domain representation of the binary string to a frequency-domain representation of the binary string;
• locating peak locations in the frequency-domain representation of the binary string;
• determining, based on the peak locations, a frequency-domain representation of the binary pattern;
• generating a self-concatenated frequency-domain representation of the binary pattern by concatenating the frequency-domain representation of the binary pattern with a duplication of the frequency-domain representation of the binary pattern;
• transforming the self-concatenated frequency-domain representation of the binary pattern to a time-domain representation of the binary pattern;
• and
• determining the binary pattern by locating instances of a predetermined message identifier in the time-domain representation of the binary pattern;
• and
• decoding the binary pattern to obtain the message.