Display method, non-transitory recording medium, and display device

1. A display method comprising:

capturing, by an imaging sensor, a still image lit up by a transmitter that transmits a signal by luminance change of light as a subject to obtain a first captured image with a first exposure time;

capturing, by the imaging sensor, the still image to obtain a second captured image with a second exposure time which is longer than the first exposure time;

decoding the signal from the first captured image;

determining whether identification information included in each of a plurality of sets is identical to the decoded signal, the plurality of sets of (i) the identification information and (ii) video being stored in a memory;

reading the video included in each of the sets with the identification information identical to the decoded signal from the memory; and

superimposing the video on a target region corresponding to the subject in the second captured image for display on a display,

wherein in the superimposing, out of a plurality of images included in the video, the plurality of images is sequentially displayed from a leading image identical to the still image,

wherein, out of a captured region of the imaging sensor, only an image projected on a display region smaller than the captured region is displayed on the display,

wherein, in the superimposing, when a projection region on which the subject is projected in the captured region is larger than the display region, out of the projection region, an image obtained by a portion exceeding the display region is not displayed on the display,

wherein, when horizontal and vertical widths of the display region are w 1 and h 1 , respectively, and horizontal and vertical widths of the projection region are w 2 and h 2 , respectively,

wherein, in the superimposing, when a larger value of h 2 /h 1 and w 2 /w 1 is equal to or greater than a predetermined value, the video is displayed on an entire screen of the display, and

when the larger value of h 2 /h 1 and w 2 /w 1 is less than the predetermined value, the video is superimposed on the target region in the second captured image and displayed on the display.

2. The display method according to claim 1 , further comprising:

transmitting the signal to a server; and

receiving the video corresponding to the signal from the server.

3. The display method according to claim 1 , wherein

the still image includes an outer frame of a predetermined color,

the display method further comprises recognizing the target region from the second captured image by the predetermined color, and

in the superimposing, the video is resized so as to become identical to the target region after recognizing in size, and

the video resized is superimposed on the target region in the second captured image and displayed on the display.

4. The display method according to claim 1 , further comprising:

turning off, when the video is displayed on the entire screen of the display, operation of the imaging sensor.

5. The display method according to claim 3 , wherein

in the superimposing, when the target region becomes unrecognizable from the second captured image due to a movement of the imaging sensor, the video is displayed in a size identical to a size of the target region recognized immediately before the target region becomes unrecognizable.

6. The display method according to claim 1 , wherein

in the superimposing, when only part of the target region is included in a region of the second captured image displayed on the display due to a movement of the imaging sensor, a part of a spatial region of the video corresponding to the part of the target region is superimposed on the part of the target region and displayed on the display.

7. The display method according to claim 6 , wherein

in the superimposing, when the target region becomes unrecognizable from the second captured image due to the movement of the imaging sensor, the part of the spatial region of the video corresponding to the part of the target region is continuously displayed, the part of the spatial region of the video being displayed immediately before the target region becomes unrecognizable.

8. The display method according to claim 5 , wherein

in the superimposing, when horizontal and vertical widths in the captured region of the imaging sensor are w 0 and h 0 , respectively, and horizontal and vertical distances between a projection region on which the subject is projected in the captured region and the captured region are dh and dw, respectively, it is determined that the target region is unrecognizable when a smaller value of dw/w 0 and dh/h 0 is equal to or less than a predetermined value.

9. The display method according to claim 5 , wherein

in the superimposing, it is determined that the target region is unrecognizable, when an angle of view is equal to or less than a predetermined value, the angle of view corresponding to a shorter distance of horizontal and vertical distances between a projection region on which the subject is projected in a captured region of the imaging sensor, and the captured region.

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

capturing, by an imaging sensor, a still image lit up by a transmitter that transmits a signal by luminance change of light as a subject to obtain a first captured image with a first exposure time;

capturing, by the imaging sensor, the still image to obtain a second captured image with a second exposure time which is longer than the first exposure time;

decoding the signal from the first captured image;

determining whether identification information included in each of a plurality of sets is identical to the decoded signal, the plurality of sets of (i) the identification information and (ii) video being stored in a memory;

reading the video included in each of the sets with the identification information identical to the decoded signal from the memory; and

superimposing the video on a target region corresponding to the subject in the second captured image for display on a display,

wherein in the superimposing, out of a plurality of images included in the video, the plurality of images is sequentially displayed from a leading image identical to the still image,

wherein, out of a captured region of the imaging sensor, only an image projected on a display region smaller than the captured region is displayed on the display,

wherein, in the superimposing, when a projection region on which the subject is projected in the captured region is larger than the display region, out of the projection region, an image obtained by a portion exceeding the display region is not displayed on the display,

wherein, when horizontal and vertical widths of the display region are w 1 and h 1 , respectively, and horizontal and vertical widths of the projection region are w 2 and h 2 , respectively,

wherein, in the superimposing, when a larger value of h 2 /h 1 and w 2 /w 1 is equal to or greater than a predetermined value, the video is displayed on an entire screen of the display, and

when the larger value of h 2 /h 1 and w 2 /w 1 is less than the predetermined value, the video is superimposed on the target region in the second captured image and displayed on the display.

11. An apparatus comprising:

an imaging sensor;

a processor; and

a memory storing thereon a computer program, which when executed by the processor, causes the processor to perform operations including:

capturing, by the imaging sensor, a still image lit up by a transmitter that transmits a signal by luminance change of light as a subject to obtain a first captured image with a first exposure time;

capturing, by the imaging sensor, the still image to obtain a second captured image with a second exposure time which is longer than the first exposure time;

decoding the signal from the first captured image;

determining whether identification information included in each of a plurality of sets is identical to the decoded signal, the plurality of sets of (i) the identification information and (ii) video being stored in a memory;

reading the video included in each of the sets with the identification information identical to the decoded signal from the memory; and

superimposing the video on a target region corresponding to the subject in the second captured image for display on a display,

wherein in the superimposing, out of a plurality of images included in the video, the plurality of images is sequentially displayed from a leading image identical to the still image,

wherein, out of a captured region of the imaging sensor, only an image projected on a display region smaller than the captured region is displayed on the display,

wherein, in the superimposing, when a projection region on which the subject is projected in the captured region is larger than the display region, out of the projection region, an image obtained by a portion exceeding the display region is not displayed on the display,

wherein, when horizontal and vertical widths of the display region are w 1 and h 1 , respectively, and horizontal and vertical widths of the projection region are w 2 and h 2 , respectively,

wherein, in the superimposing, when a larger value of h 2 /h 1 and w 2 /w 1 is equal to or greater than a predetermined value, the video is displayed on an entire screen of the display, and

when the larger value of h 2 /h 1 and w 2 /w 1 is less than the predetermined value, the video is superimposed on the target region in the second captured image and displayed on the display.

12. The apparatus according to claim 11 , wherein

the imaging sensor includes a plurality of micro mirrors and a photosensor, and

the operations further including:

specifying a region including the signal out of the first captured image as a signal region;

controlling an angle of each of the plurality of micro mirrors corresponding to the specified signal region; and

causing the photosensor to receive light reflected by each of the plurality of micro mirrors with the angle being controlled.