Methods and Devices for Transmitting/Obtaining Identification Information and Positioning by Visible Light Signal

A method for positioning by visible light signals, the method comprising:

• obtaining at a position one or more images at one or more time points from a visible light signal having its level changed between a peak level and a bottom level with varied frequencies at different time points emitted by a light source;
• measuring varied numbers of bright or dark stripes in the one or more images, the varied numbers of bright or dark stripes being corresponding to the varied frequencies;
• obtaining identification information of the light source corresponding to the varied number of the bright or dark stripes;
• and
• determining the position by checking the identification information in a predetermined map database.

A device for positioning by visible light signal, comprising:

• an image sensor configured to obtain at a position one or more images at one or more time points from a visible light signal having its level changed between a peak level and a bottom level with varied frequencies at different time points emitted by a light source;
• a memory configured to store the one or more images obtained by the image sensor at one or more time points;
• and
• a processor configured to measure varied numbers of bright or dark stripes in the one or more images stored in the memory, obtain identification information of the light source corresponding to the varied number of the bright and dark stripes, and determine the position by checking the identification information in a predetermined map database, the varied numbers of bright or dark stripes being corresponding to the varied frequencies.