| CPC H04B 10/114 (2013.01) | 17 Claims |
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1. A communication method, comprising:
performing a sending method by a sending device comprising a first invisible light signal emitter, wherein the sending method comprises:
loading a signal pulse pattern encoded with a data sequence;
scanning a camera frame rate broadcasted by a receiving device; and
emitting, by the first invisible light signal emitter, first signal pulses at a signal pulse rate same as the camera frame rate, wherein the signal pulse pattern is repeated in the first signal pulses,
performing a receiving method by the receiving device comprising a visible light camera module that is capable of capturing invisible light emitted by the first invisible light signal emitter, wherein the receiving method comprises:
broadcasting the camera frame rate; and
capturing, by the visible light camera module, a plurality of first frames at the camera frame rate with an exposure time interval of a shutter of the visible light camera module set to be within a single pulse period,
wherein each first frame comprises a corresponding first area caused by a corresponding signal pulse of a first portion of the first signal pulses;
the receiving method further comprising:
detecting the corresponding first area in each first frame; and
labeling the corresponding first area in each first frame, to obtain a first coding pattern corresponding to the signal pulse pattern, and decoding the first coding pattern, to identify the data sequence,
wherein the receiving method further comprises the following steps before the step of capturing the first frames at the camera frame rate:
capturing a second frame with the exposure time interval of the shutter of the visible light camera module; and
decreasing the exposure time interval such that visibility of a third area in a third frame captured with the decreased exposure time interval is higher than the visibility of the second area,
wherein the first frames are captured using the decreased exposure time interval.
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