Communication apparatus, communication system, and data communication method

A receiving apparatus, comprising:

• an image acquisition section configured to:
• capture a projected image, wherein
• the projected image is projected by a projector that includes a DMD (Digital Micromirror Device),
• the projected image includes a communication data image and a viewing image,
• the viewing image comprises a plurality of sub-frames,
• the projector switches between the plurality of sub-frames within one image frame output time period to output the viewing image,
• output of the communication data image is continuous for the one image frame output time period,
• each bit value of the communication data image is set based on each configuration bit value of a plurality of configuration bit values of communication data,
• the set each bit value of the communication data image is one of equal or inverse of each bit value of a last sub-frame of the plurality of sub-frames, and
• the last sub-frame immediately precedes output of the communication data image;
• detect an event which is a luminance change equal to or greater than a specific threshold;
• and
• output event information including a pixel position and occurrence time of an event occurrence pixel;
• an event analysis section configured to:
• receive the event information;
• determine a first match between an event occurrence interval of the event and the one image frame output time period;
• and
• detect the communication data image included in the projected image based on the determination;
• and
• a data analysis section configured to acquire the communication data from the communication data image based on the plurality of configuration bit values of the communication data image.

A communication system, comprising:

• a transmission apparatus;
• and
• a receiving apparatus, wherein
• the transmission apparatus includes:
• an output image generation section configured to generate a communication data image that includes communication data,
• a projector including a DMD (Digital Micromirror Device), wherein the projector is further configured to:
• set a first output time period of the communication data image and a second output time period of each of a plurality of sub-frames of a viewing image, wherein the first output time period is longer than the second output time period;
• output each of the plurality of sub-frames of the viewing image in the set second output time period;
• output the communication data image in the set first output time period;
• and
• output the viewing image based on switch over between the plurality of sub-frames of the viewing image within one image frame output time period,
• each of the plurality of sub-frames includes a binary image, and
• the receiving apparatus includes:
• an image acquisition section capturing configured to:
• capture a projected image, wherein
• the projected image is projected by the projector,
• the projected image includes the viewing image and the communication data image, and
• the communication data image is continuously output for the one image frame output time period;
• detect an event corresponding to a luminance change equal to or greater than a specific threshold;
• and
• output event information including a pixel position and occurrence time of an event occurrence pixel;
• and
• an event analysis section is configured to:
• receive the event information;
• determine that an event occurrence interval of the event matches the one image frame output time period;
• and
• detects the communication data image based on the determination;
• and
• a data analysis section configured to acquire the communication data from the communication data image.

A data communication method, comprising:

• in a transmission apparatus:
• setting each bit value of a communication data image based on each configuration bit value of communication data, wherein
• the set each bit value of the communication data image is one of equal or inverse of each bit value of a specific sub-frame of a plurality of sub-frames of a viewing image, and
• the specific sub-frame immediately precedes output of the communication data image;
• generating, based on the set each bit value of the communication data image, the communication data image that includes the communication data;
• setting a first output time period of the communication data image and a second output time period of each of the plurality of sub-frames, wherein the first output time period is longer than the second output time period;
• output each of the plurality of sub-frames of the viewing image in the set second output time period;
• and
• output the communication data image in the set first output time period.

A data communication method, comprising

• in a receiving apparatus:
• capturing a projected image, wherein
• the projected image is projected by a projector,
• the projected image includes a communication data image and a viewing image,
• the viewing image comprises a plurality of sub-frames,
• the projector switches between the plurality of sub-frames within one image frame output time period to output the viewing image;
• output of the communication data image is continuous for the one image frame output time period,
• each bit value of the communication data image is set based on each configuration bit value of a plurality of configuration bit values of communication data,
• the set each bit value of the communication data image is one of equal or inverse of each bit value of a last sub-frame of the plurality of sub-frames, and
• the last sub-frame immediately precedes output of the communication data image;
• detecting an event corresponding to a luminance change equal to or greater than a specific threshold;
• outputting event information including a pixel position and occurrence time of an event occurrence pixel;
• receiving the event information;
• determining that event occurrence interval of the event matches the one image frame output time period;
• detecting the communication data image contained in the projected image based on the determination;
• and
• acquiring the communication data from the communication data image based on the plurality of configuration bit values of the communication data image.

A non-transitory computer-readable medium having stored thereon computer-executable instructions that, when executed by a transmission apparatus, cause the transmission apparatus to execute operations, the operations comprising:

• setting each bit value of a communication data image based on each configuration bit value of communication data, wherein
• the set each bit value of the communication data image is one of equal or inverse of each bit value of a specific sub-frame of a plurality of sub-frames of a viewing image, and
• the specific sub-frame immediately precedes output of the communication data image;
• generating the communication data image that includes the communication data;
• setting a first output time period of the communication data image and a second output time period of each of the plurality of sub-frames, wherein the first output time period is longer than the second output time period;
• outputting each of the plurality of sub-frames of the viewing image in the set second output time period;
• and
• outputting the communication data image in the set first output time period.

A non-transitory computer-readable medium having stored thereon computer-executable instructions that, when executed by a receiving apparatus, cause the receiving apparatus to execute operations, the operations comprising:

• capturing a projected image, wherein
• the projected image is projected by a projector, wherein
• the projected image includes a communication data image and a viewing image,
• the viewing image comprises a plurality of sub-frames,
• the projector switches between the plurality of sub-frames within one image frame output time period to output the viewing image;
• output of the communication data image is continuous for the one image frame output time period,
• each bit value of the communication data image is set based on each configuration bit value of a plurality of configuration bit values of communication data,
• the set each bit value of the communication data image is one of equal or inverse of each bit value of a last sub-frame of the plurality of sub-frames, and
• the last sub-frame immediately precedes output of the communication data image;
• detecting an event corresponding to a luminance change equal to or greater than a specific threshold;
• outputting event information including a pixel position and occurrence time of an event occurrence pixel;
• receiving the event information;
• determining that event occurrence interval of the event matches the one image frame output time period;
• and
• detecting the communication data image included in the projected image based on the determination;
• and
• acquiring the communication data from the communication data image based on the plurality of configuration bit values of the communication data image.