Information communication method

1. A method, comprising:

setting an exposure time of an image sensor included in a terminal device so that, in an image obtained by capturing a subject by the image sensor, a bright line corresponding to each of a plurality of exposure lines included in the image sensor appears according to a change in luminance of the subject;

obtaining a bright line image including a plurality of bright lines, by capturing the subject that changes in luminance by the image sensor with the set exposure time;

estimating a plurality of center areas each of which is in each of the plurality of bright lines; and

obtaining identification information of the subject, by demodulating data specified by a pattern of the plurality of center areas.

2. The method according to claim 1 ,

wherein the pattern is specified by brightness values each of which is corresponding to each of the plurality of center areas.

3. The method according to claim 2 , further comprising:

estimating a location of the subject by an area, wherein the area is specified by the plurality of center areas.

4. The method according to claim 3 ,

wherein the estimating of the location of the subject includes,

calculating a number of pixels each of which has a brightness value that is bigger than a first threshold value, and

determining the subject is located in a line or row in the bright line image when the number of pixels in the line of the row is bigger than a second threshold value.

5. The method according to claim 1 ,

wherein each of the plurality of center areas corresponds to a center of each of the plurality of bright lines.

6. The method according to claim 5 ,

wherein the subject includes a reflection board, and

the bright line image is a reflected image.

7. A device, comprising:

a processor, and

a non-transitory recoding medium storing thereon a computer program, which when executed by the processor, causes the processor to perform operations including

setting an exposure time of an image sensor included in a terminal device so that, in an image obtained by capturing a subject by the image sensor, a bright line corresponding to each of a plurality of exposure lines included in the image sensor appears according to a change in luminance of the subject;

obtaining a bright line image including a plurality of bright lines, by capturing the subject that changes in luminance by the image sensor with the set exposure time;

estimating a plurality of center areas each of which is in each of the plurality of bright lines; and

obtaining identification information of the subject, by demodulating data specified by a pattern of the plurality of center areas.

8. A non-transitory recoding medium storing thereon a computer program, which when executed by a processor, causes the processor to perform operations including:

setting an exposure time of an image sensor included in a terminal device so that, in an image obtained by capturing a subject by the image sensor, a bright line corresponding to each of a plurality of exposure lines included in the image sensor appears according to a change in luminance of the subject;

obtaining a bright line image including a plurality of bright lines, by capturing the subject that changes in luminance by the image sensor with the set exposure time;

estimating a plurality of center areas each of which is in each of the plurality of bright lines; and

obtaining identification information of the subject, by demodulating data specified by a pattern of the plurality of center areas.