Patent ID: 11870493
Assignee: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A communication method, comprising:
performing a receiving method by a receiving device comprising a visible light camera module that is capable of capturing invisible light emitted by a first invisible light signal emitter of a sending device, wherein the receiving method comprises:
broadcasting a camera frame rate;
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 first signal pulses, and the first signal pulses are emitted by the first invisible light signal emitter at a signal pulse rate same as the camera frame rate;
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 a signal pulse pattern, and decoding the first coding pattern, to identify a data sequence,

the method further comprising:
performing a sending method by the sending device comprising the first invisible light signal emitter, wherein the sending method comprises:
loading the signal pulse pattern encoded with the data sequence;
scanning the camera frame rate broadcasted by the receiving device; and
emitting, by the first invisible light signal emitter, the first signal pulses at the signal pulse rate, wherein the signal pulse pattern is repeated in the first signal pulses,
wherein the invisible light emitted by the first invisible light signal emitter is infrared,

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.