Luminance change information communication method
An information communication method of transmitting a signal using a change in luminance is provided. The information communication method includes: determining a pattern of the change in luminance, by modulating the signal to be transmitted; and transmitting the signal, by at least one light emitter changing in luminance according to the determined pattern of the change in luminance. The signal has a plurality of blocks. Each block of the plurality of blocks includes (i) address information to indicate a position of a data segment in the signal, and (ii) the data segment. In the transmitting, the signal is transmitted repeatedly at different times.
1. An information communication method of transmitting a signal using a change in luminance, the information communication method comprising:
determining a pattern of the change in luminance, by modulating the signal to be transmitted; and
transmitting the signal, by at least one light emitter changing in luminance according to the determined pattern of the change in luminance,
wherein, the signal has a plurality of blocks, each block of the plurality of blocks includes (i) address information that indicates a position of a data segment in the signal and (ii) the data segment, and
wherein, in the transmitting, the signal is transmitted repeatedly at different times,
wherein the address information is used to identify a same data segment in the signal transmitted at a first time and in the signal transmitted at a second time, which is different from the first time.
2. An information communication method of receiving the signal transmitted by the information communication method according to claim 1 , the information communication method comprising:
repeatedly receiving an image by capturing the at least one light emitter with an image sensor; and
repeatedly receiving the signal by demodulating a stripe pattern included in the obtained image,
wherein, in the repeatedly receiving of the signal, when one block of the plurality of blocks included in the signal fails to be obtained at the first time, while other blocks of the plurality of blocks are obtained at the first time, and the one block is successfully received from the plurality of blocks included in the signal obtained at the second time, which is different from the first time, the complete signal is obtained by concatenating the data segments in blocks of the plurality of blocks obtained at the first time, with the data segment in the one block obtained at the second time.
3. The information communication method according to claim 2 ,
wherein, the signal has a check signal to identify all the plurality of the blocks, and
wherein, in the repeatedly receiving of the signal, whether or not all the plurality of blocks included in the signal is obtained is determined using the check signal.
4. A non-transitory recording medium storing a computer program, which, when executed by a processor, causes the processor to perform operations the information communication method according to claim 1 .
5. An apparatus comprising:
a processor; and
a memory storing a computer program, which, when executed by the processor, causes the processor to perform operations of the information communication method according to claim 1 .
6. The information communication method according to claim 1 , wherein
the address information indicates which one of the plurality of blocks in the signal includes the address information, such that, when two repeatedly transmitted signals are received, the same data segment, of the two repeatedly transmitted signals, is identified based on the address information.
7. The information communication method according to claim 1 , wherein
the address information is used for data segment concatenation in receiving of the signal,
when the address information is successfully received at the first time, the signal is reproduced by locating the data segment according to the address information received at the first time,
when the address information fails to be received at the first time and the address information is successfully received at the second time, the signal is reproduced by locating the data segment according to the address information received at the second time.