Information communication device

An information communication device that obtains information from a subject using an image sensor including a plurality of exposure lines, the information communication device comprising:

• a normal imaging unit configured to obtain first image data by starting exposure sequentially for the plurality of exposure lines in the image sensor each at a different time and performing image capture with a first exposure time so that an exposure time of each of the plurality of exposure lines partially overlaps with an exposure time of an adjacent one of the plurality of exposure lines;
• and
• a visible light communication unit configured to obtain second image data by starting exposure sequentially for the plurality of exposure lines each at a different time and performing image capture with a second exposure time shorter than the first exposure time so that an exposure time of each of the plurality of exposure lines partially overlaps with an exposure time of an adjacent one of the plurality of exposure lines, and obtain information by demodulating a bright line pattern that appears in the second image data, the bright line pattern corresponding to the plurality of exposure lines,
• wherein the visible light communication unit is configured to set the second exposure time to less than or equal to 1/480 second and set a sensitivity of the image sensor to a value higher than a sensitivity of the image sensor for obtaining the first image data, to cause the bright line pattern to appear in the second image data.

A non-transitory computer-readable recording medium for use in a computer, the recording medium having recorded thereon a computer program for obtaining information from a subject using an image sensor including a plurality of exposure lines and causing the computer to execute:

• obtaining first image data by starting exposure sequentially for the plurality of exposure lines in the image sensor each at a different time and performing image capture with a first exposure time so that an exposure time of each of the plurality of exposure lines partially overlaps with an exposure time of an adjacent one of the plurality of exposure lines;
• and
• obtaining second image data by starting exposure sequentially for the plurality of exposure lines each at a different time and performing image capture with a second exposure time shorter than the first exposure time so that an exposure time of each of the plurality of exposure lines partially overlaps with an exposure time of an adjacent one of the plurality of exposure lines, and obtaining information by demodulating a bright line pattern that appears in the second image data, the bright line pattern corresponding to the plurality of exposure lines,
• wherein in the obtaining of second image data, the second exposure time is set to less than or equal to 1/480 second and a sensitivity of the image sensor is set to a value higher than a sensitivity of the image sensor in the obtaining of first image data, to cause the bright line pattern to appear in the second image data.