Patent ID: 9407367
Filing Date: 2016-08-02
CPC Classification: H04B

Claim Text:
1. A method for transmitting information by visible light signals of a visible light source with light sources of different colors, the method comprising: determining a distance and a relative position from the visible light source to an image sensor; setting a modulating period of driving signals for the visible light source in accordance with a rolling shutter speed of the image sensor; modulating, based on the modulating period, two or more driving signals of the light sources to obtain two or more modulated driving signals for driving the light sources to emit the visible light signals of different colors having their levels changed between peak levels and bottom levels with different frequencies and/or different phases and/or different amplitudes according to transmitting information; emitting by the visible light source the visible light signals on the basis of the two or more modulated driving signals at the determined distance and relative position to the image sensor; receiving an image with a series of stripes by the image sensor; identifying within the image a beginning stripe representing a beginning of the series of stripes; and decoding from the image the transmitting information according to the series of stripes, wherein the distance and the relative position is determined such that there is the beginning stripe in every image received by the image sensor, and wherein the modulation period is set such that the series of stripes is identified in the image received by the image sensor.