Live streaming device

Abstract

To provide a live streaming device for enabling a viewer to obtain a privilege of having evidence proving that a performer is watching the viewer in live streaming.SOLUTION: A streaming audio / video generation unit 27 generates streaming video based on captured images of performers captured by a video streaming camera 6. A viewer image receiving unit 21 receives a viewer image showing each viewer. A monitor display control unit 22 controls the display of the viewer image of each viewer on a performer's side monitor 4 which is installed such that the performer can see it. A gaze detection unit 24 detects a performer's gaze at the performer's side monitor 4. A gaze level generation unit 25 generates a gaze level indicating the degree to which the performer's gaze is directed for each viewer, based on the gaze detected by the gaze detection unit 24. A non-fungible token issuance unit 28 issues, as a non-fungible token, a still image or a video of a predetermined period of time based on a streaming video for each viewer when the gaze level is equal to or above a threshold value.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a live distribution device.

Background Art

[0002] In recent years, live distribution of live performances by performers has been carried out online.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When live participants watch a live performance by a performer at a live venue, the participants can have experiences such as making eye contact with the performer or the performer waving at them. However, in live distribution, the same experience cannot be had between the performer and viewers located in a remote area away from the live venue. Viewers have a desire to obtain a privilege having evidence proving that the performer is looking at them in live distribution.

[0005] An object of the present invention is to provide a live distribution device that enables a viewer to obtain a privilege having evidence proving that a performer is looking at the viewer in live distribution.

Means for Solving the Problems

[0006] The present invention provides a live distribution device including: a distribution video generation unit that generates a distribution video to be distributed to a plurality of viewers based on a captured image of a performer captured by a camera for video distribution; a viewer image reception unit that receives viewer images indicating the plurality of viewers; a monitor display control unit that controls to display the viewer images of the respective viewers on a performer-side monitor installed so as to be visible to the performer; a gaze detection unit that detects a gaze, which is a direction in which the performer looks at the performer-side monitor, based on a captured image of the performer captured by a camera for gaze detection; a gaze level generation unit that generates a gaze level indicating the degree to which the gaze of the performer is directed at each viewer among the plurality of viewers based on the gaze detected by the gaze detection unit; and a non-fungible token issuance unit that issues, as non-fungible tokens, still images or moving images of a predetermined time based on the distribution video when the gaze level for each viewer is equal to or higher than a threshold value.

Advantages of the Invention

[0007] According to the live distribution device of the present invention, a viewer can obtain a privilege of having evidence that the performer is looking at him / her in the live distribution.

Brief Description of the Drawings

[0008]

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DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a live distribution apparatus according to an embodiment will be described with reference to the accompanying drawings. As shown in FIG. 1, a live distribution apparatus 100 according to an embodiment includes a communication unit 1, a control unit 2, a viewer information holding unit 3, a performer-side monitor 4, a gaze detection camera 5, a video distribution camera 6, and a microphone 7. The live distribution apparatus 100 is connected to viewer terminals 50a to 50d and other viewer terminals (not shown) via a network 30. Typically, the network 30 is the Internet. Any viewer terminal will be referred to as the viewer terminal 50.

[0010] The control unit 2 includes a viewer image receiving unit 21, a monitor display control unit 22, a face detection unit 23, a gaze detection unit 24, a gaze level generation unit 25, a video distribution control unit 26, a distributed audio-video generation unit 27, and a non-fungible token issuing unit 28. Hereinafter, non-fungible token will be abbreviated as NFT. The control unit 2 can be configured by a central processing unit (microprocessor) of a computer device. A part of the configurations of the viewer image receiving unit 21 to the NFT issuing unit 28 may be provided outside the control unit 2.

[0011] As shown in FIG. 2, the viewer terminal 50 includes a communication unit 51, a camera 52, an image transmission unit 53, an audio-video receiving unit 54, a display unit 55, a speaker 56, and an operation unit 57.

[0012] As shown in FIG. 3, the live performance performer 40 is singing on the stage 80. The microphone 7 picks up the voice emitted by the performer 40. Here, the performer 40 is regarded as a singer, but the performer 40 may be a musical instrument player such as a guitarist, or may be a performance other than music. In front of the stage 80, the performer-side monitor 4 is installed. The performer-side monitor 4 may be a single monitor or multiple monitors. The performer-side monitor 4 may be a screen on which an image is projected by a projector.

[0013] Three video distribution cameras 6a to 6c as the video distribution camera 6 are photographing the performer 40. The video distribution camera 6 may be one, or may be two or four or more. By a switch (not shown), any one of the photographed images by the video distribution cameras 6a to 6c is selected and distributed to each viewer terminal 50. On the upper surface of the central part of the performer-side monitor 4, the line-of-sight detection camera 5 is arranged. The position where the line-of-sight detection camera 5 is arranged is not limited to the upper surface of the central part of the performer-side monitor 4. When there are a plurality of performer-side monitors 4, a line-of-sight detection camera 5 is provided corresponding to each performer-side monitor 4.

[0014] In FIG. 1, the distribution audio-video generation unit 27 generates distribution audio-video based on the photographed image of the performer 40 by the video distribution camera 6 (6a to 6c) and the audio picked up by the microphone 7, and supplies it to the communication unit 1. The distribution audio-video generation unit 27 includes a distribution video generation unit and a distribution audio generation unit. The communication unit 1 distributes the distribution audio-video to each viewer terminal 50 via the network 30. In FIG. 2, the communication unit 51 acquires the distributed distribution audio-video and supplies it to the audio-video receiving unit 54. The audio-video receiving unit 54 receives the distribution audio-video. The display unit 55 displays the distribution video, and the speaker 56 outputs the distribution audio.

[0015] When viewer 60 is watching the distributed video being displayed on display unit 55, camera 52 captures the face of viewer 60. Image transmission unit 53 transmits the viewer image (hereinafter referred to as the face image) of viewer 60 captured by camera 52 to live distribution device 100 via communication unit 51 and network 30. Each viewer terminal 50 similarly transmits a face image of each viewer 60 captured to live distribution device 100. In FIG. 1, viewer image receiving unit 21 supplies the face images transmitted from each viewer terminal 50 to monitor display control unit 22.

[0016] As partially shown in the performer-side monitor 4 of FIG. 3, monitor display control unit 22 divides the screen of performer-side monitor 4 into a plurality of sections, and controls the image display on the screen to display the face images of each viewer 60 transmitted from each viewer terminal 50 within each section. In FIG. 3, the face images of viewer 60 are also displayed in the sections where no face image is displayed. Although performer 40 and each viewer 60 are located in remote locations, by displaying the face images of each viewer 60 on performer-side monitor 4, performer 40 can sing while feeling as if a plurality of viewers 60 are watching performer 40 closely as an audience.

[0017] Viewer information holding unit 3 holds information about each viewer 60, such as information for identifying the viewer terminal 50 of each viewer 60 and information about the fee (ticket fee) paid by each viewer 60 to receive the distributed audio-visual content. Viewer information holding unit 3 may hold a ticket type that can identify the ticket fee instead of the ticket fee. Monitor display control unit 22 refers to the information held in viewer information holding unit 3 and causes the face images of each viewer 60 to be displayed in each section.

[0018] The gaze detection camera 5 captures performer 40. Face detection unit 23 detects the face image of performer 40 based on the captured image of performer 40 captured by gaze detection camera 5. By face detection unit 23 detecting the face image of performer 40, it is possible to detect where performer 40 is located in the left-right direction of stage 80. Face detection unit 23 supplies the position information of performer 40 to monitor display control unit 22.

[0019] The monitor display control unit 22 may randomly display the face images of a plurality of viewers 60 in a plurality of sections on the screen of the performer-side monitor 4, or may determine the sections for displaying the face images according to the ticket price. In the latter case, the monitor display control unit 22 causes the face images to be displayed in sections closer to the performer 40 as the ticket price is higher. When there are a plurality of viewers 60 who have paid the same high ticket price, the monitor display control unit 22 determines a predetermined area close to the performer 40, and randomly displays the face images of the plurality of people in the sections within that area.

[0020] Regarding the viewers 60 of the viewer terminals 50a to 50d as viewers 60a to 60d, assume that viewers 60a to 60d are some of the viewers 60 who have paid a high ticket price. Fig. 4A shows a state where the performer 40 is located to the left of the stage 80. The monitor display control unit 22 causes viewers 60a to 60d to be displayed in sections within an area close to the performer 40 located on the left. Fig. 4B shows a state where the performer 40 located to the left of the stage 80 has moved to the right of the stage 80. The monitor display control unit 22 causes viewers 60a to 60d to be displayed in sections within an area close to the performer 40 who has moved to the right.

[0021] When the monitor display control unit 22 displays the face images of the viewers 60 who have paid a high ticket price in sections closer to the performer 40, the viewers 60 who have paid a high ticket price are more likely to be seen by the performer 40. Therefore, if the monitor display control unit 22 is configured to display the face images in sections closer to the performer 40 as the ticket price is higher, it will motivate the viewers 60 to pay a higher ticket price.

[0022] The viewer 60 may purchase a ticket that allows the face image to be displayed in a section closer to the performer 40 only when the performer 40 sings a specific song among the songs. When purchasing a ticket, the viewer 60 may select a song for which the face image can be displayed in a section closer to the performer 40, and pay the price according to the selected song.

[0023] The line-of-sight detection unit 24 detects the line of sight in the direction in which the performer 40 looks at the performer-side monitor 4 based on the face image of the performer 40 detected by the face detection unit 23. The line-of-sight level generation unit 25 generates a line-of-sight level indicating the degree to which the line of sight of the performer 40 is directed at each of the plurality of viewers 60 based on the line of sight of the performer 40 detected by the line-of-sight detection unit 24.

[0024] As an example, the line-of-sight level generation unit 25 generates the line-of-sight level as follows. As shown by the arrow in FIG. 5 indicating the line of sight of the performer 40, assume that the performer 40 is looking at a face image (not shown) displayed in the section immediately to the right of the section in which the face image of the viewer 60a is displayed. The line-of-sight level generation unit 25 generates a heat map according to the position of the line of sight, as conceptually shown by the shading of the hatching, and sets the degree of shading of the heat map as the line-of-sight level. The line-of-sight level becomes a larger value the closer it is to the line of sight of the performer 40, and a smaller value the farther it is from the line of sight. The line-of-sight level may be 0 when it is a certain distance away from the line of sight.

[0025] The line-of-sight level generation unit 25 refers to the information held in the viewer information holding unit 3, acquires information indicating how the face images of the respective viewers 60 are displayed in the plurality of sections on the screen of the performer-side monitor 4 from the monitor display control unit 22, and generates a line-of-sight level for each viewer 60.

[0026] The video distribution control unit 26 controls the distribution audio-video generation unit 27 so that a level image indicating the line-of-sight level for each viewer 60 generated by the line-of-sight level generation unit 25 is superimposed on the distribution video generated by the distribution audio-video generation unit 27. FIG. 6A shows an example of the distribution video displayed on the display unit 55 of the viewer terminal 50 of the viewer 60 with a low line-of-sight level. FIG. 6B shows an example of the distribution video displayed on the display unit 55 of the viewer terminal 50 of the viewer 60 with a high line-of-sight level at the same timing as FIG. 6A. The line-of-sight level of each viewer 60 is determined by the position of the face image of each viewer 60 on the screen of the performer-side monitor 4 and the direction in which the performer 40 looks at the performer-side monitor 4.

[0027] As shown in FIGS. 6A and 6B, a level image 250 is superimposed on, for example, the upper right end of the distributed video. As an example, the level image 250 includes four circles. If the line-of-sight level is 0, all the circles are in the off state. If the line-of-sight level is 1, one circle at the left end is in the on state. If the line-of-sight level is 2, two circles from the left are in the on state. If the line-of-sight level is 3, three circles from the left are in the on state. If the line-of-sight level is the maximum of 4, all the circles are in the on state. The level image 250 shows five levels of line-of-sight levels with four circles. The number of levels of the line-of-sight level may be two or more, and the level image 250 may be a bar or the like whose length changes according to the line-of-sight level other than a circle.

[0028] As shown in FIG. 7, assume that a performer 40 located approximately at the center of the stage 80 is looking at a face image of an audience 60e displayed in a section near the right end as seen from the performer 40 on the screen of the performer-side monitor 4. Assume that the live distribution device 100 distributes a captured image of the performer 40 taken by a video distribution camera 6a located at the center to each audience terminal 50. FIG. 8 shows an example of the distributed video displayed on the display unit 55 of the audience terminal 50 of the audience 60e. Since the performer 40 is looking at the audience 60e, the level image 250 is in the state where the line-of-sight level is maximum.

[0029] Assume that the NFT issuing unit 28 is configured to issue a still image based on the distributed video or a moving image of a predetermined time based on the distributed audio-video as an NFT when the line-of-sight level is 3 or more. The line-of-sight level 3 is an example of a threshold for the NFT issuing unit 28 to determine to issue an NFT. The NFT issuing unit 28 issues an NFT when the line-of-sight level is equal to or higher than a predetermined threshold.

[0030] Here, assume that the NFT issuing unit 28 issues a still image based on the distributed video as an NFT. FIG. 9 shows an NFT image 280 which is a still image of the NFT issued by the NFT issuing unit 28. A line-of-sight level mark 281 corresponding to the level image 250 is superimposed on the NFT image 280. The line-of-sight level mark 281 may not be superimposed on the NFT image 280.

[0031] As shown in FIG. 10, the NFT issuing unit 28 may superimpose an additional image 282 including the face image of the viewer 60e on the NFT image 280. As shown in FIG. 11, by supplying the NFT issuing unit 28 with information indicating how the monitor display control unit 22 controls the display of the face images of the respective viewers 60 in the sections of the screen of the performer-side monitor 4, and the face images, it is possible to realize the NFT image 280 on which the additional image 282 shown in FIG. 10 is superimposed.

[0032] The NFT issuing unit 28 may record the NFT image 280 on the blockchain, or may record a URL (Uniform Resource Locator) for viewing the NFT image 280 on the blockchain. The viewer 60 can purchase the NFT image 280. The NFT issuing unit 28 preferably sets a price corresponding to the line-of-sight level for the NFT image 280 by making the price of the NFT image 280 when the line-of-sight level is 4 higher than the price of the NFT image 280 when the line-of-sight level is 3.

[0033] The NFT issuing unit 28 records a digital certificate on the blockchain that proves that the line-of-sight level is equal to or higher than the threshold value. This digital certificate is evidence that proves that the performer 40 is looking at the viewer 60 (here, the viewer 60e) who purchased the NFT image 280 among the plurality of viewers 60 displayed on the performer-side monitor 4. The NFT image 280 is a privilege having evidence that proves that the viewer 60 is being looked at by the performer 40 in the live distribution. When the viewer 60 operates the operation unit 57 to purchase the NFT image 280, the NFT issuing unit 28 records a digital certificate on the blockchain that proves that the purchasing viewer 60 is the owner of the NFT image 280.

[0034] When the NFT image 280 is purchased, services such as a discount coupon for the ticket of the next live distribution may be attached to the purchaser of the NFT image 280.

[0035] As shown in FIG. 12, the live distribution device 100 preferably includes a facial expression detection unit 291 and a hand gesture detection unit 292. The facial expression detection unit 291 detects the facial expression of the performer 40 based on the face image of the performer 40 detected by the face detection unit 23. The hand gesture detection unit 292 detects the hand gesture of the performer 40 based on the captured image captured by the camera 5 for gaze detection of the performer 40. The facial expression and hand gesture of the performer 40 are used as gestures. The facial expression detection unit 291 and the hand gesture detection unit 292 are gesture detection units. The live distribution device 100 may include only one of the facial expression detection unit 291 and the hand gesture detection unit 292.

[0036] In addition to the performer 40 looking at a certain viewer 60, when the performer 40 shows a smiling face or makes a special hand gesture such as waving to the viewer 60 who is being looked at, the live video at that moment is a captured image with high rarity for the viewer 60 being looked at. The NFT issuing unit 28 may calculate the rarity described later and reflect the rarity in the price of the NFT image 280.

[0037] As shown in FIG. 13, as the facial expression of the performer 40, a coefficient is set to 1.5 for a smiling face and 2.3 for winking. Also, as the hand gesture of the performer 40, a coefficient is set to 1.5 for a good pose, 1.6 for pointing at the viewer 60 with a finger, 1.8 for waving a hand, and 3.0 for making a heart mark with both hands. These coefficient values are merely examples. In particular, if there is no gesture, the coefficient is 1.0. The coefficient may be set according to the likelihood of the facial expression detected by the facial expression detection unit 291 or the hand gesture detected by the hand gesture detection unit 292. In this case, the higher the likelihood, the larger the coefficient may be set.

[0038] The NFT issuing unit 28 calculates the rarity by multiplying the coefficient for each gesture by the gaze level. For example, if the gaze level is 3 and the performer 40 has a smiling face, the rarity is 4.5 from 1.5×3. For example, if the gaze level is 4, the performer 40 has a smiling face and is waving a hand, the rarity is 13.2 from (1.5 + 1.8)×4.

[0039] As shown in FIG. 14, assume that the performer 40 located approximately in the center of the stage 80 has a smiling face and is waving at the face image of the viewer 60f displayed in the section near the center of the screen of the performer-side monitor 4. Assume that the live distribution device 100 is distributing the captured image of the performer 40 taken by the video distribution camera 6a located in the center to each viewer terminal 50. FIG. 15 shows the NFT image 280 issued by the NFT issuing unit 28. The line-of-sight level is 4, and the line-of-sight level mark 281 indicating that the line-of-sight level is 4 and the additional image 282 including the face image of the viewer 60f are superimposed.

[0040] Since the NFT image 280 shown in FIG. 15 has a line-of-sight level of 4 and the performer 40 has a smiling face and is waving, the rarity is 13.2. The NFT issuing unit 28 may reflect the rarity of 13.2 in the price of the NFT image 280 and make it higher than the price of the NFT image 280 when there is no gesture shown in FIG. 13.

[0041] When the NFT issuing unit 28 issues a video of a predetermined time as an NFT, it may calculate the rarity by multiplying the time during which the line-of-sight level continues to exceed the threshold. For example, assume that the video is 10 seconds long and the line-of-sight level 3 continues for 6 seconds. The rarity at this time is 18 from 6×3. If the performer 40 has a smiling face, it is 27 from 6×1.5×3. For example, assume that the line-of-sight level 3 only continues for 2 seconds. The rarity at this time is 6 from 2×3. If the performer 40 has a smiling face, it is 9 from 2×1.5×3. The longer the time during which the line-of-sight level continues to exceed the threshold, the greater the rarity.

[0042] As shown in FIG. 16, two performers, performer 40 and guitarist performer 41, are performing a live performance, and a distribution video including performers 40 and 41 is displayed on the display unit 55 of the viewer terminal 50. The distribution video may be generated based on captured images of two or more performers. In such a case, the distribution audio-video generation unit 27 displays a level image 250 indicating the line-of-sight level of performer 40 and a level image 251 indicating the line-of-sight level of performer 41. In the example shown in FIG. 16, the line-of-sight level of performer 40 is 3 and the line-of-sight level of performer 41 is 2. Since the line-of-sight level of performer 40 is 3, the NFT issuing unit 28 issues an NFT image 280.

[0043] At this time, the NFT issuing unit 28 reflects the number of performers in the rarity. Here, assuming that there are no gestures from both performers 40 and 41, the rarity is 5 from 1.0×3 + 1.0×2. If the line-of-sight levels of both performers 40 and 41 are 4, the rarity is 8 from 2×1.0×4. Since it is rare for both performers 40 and 41 to look at the same viewer 60 at the same time, the rarity becomes high.

[0044] Using the flowchart shown in FIG. 17, the live distribution method executed by the live distribution device 100 will be described again. In FIG. 17, when the live distribution device 100 starts operating, the live distribution device 100 distributes, as a distribution video, a captured image of performer 40 (or performers 40 and 41) to each viewer 60 in step S1. The live distribution device 100 receives the face images of each viewer 60 in step S2. The live distribution device 100 causes the face images of each viewer 60 to be displayed on the performer-side monitor 4 in step S3.

[0045] The live streaming device 100 detects the line of sight of the performer 40 (or performers 40 and 41) in step S4. The live streaming device 100 generates a line-of-sight level for each viewer 60 in step S5. The live streaming device 100 determines in step S6 whether there is a viewer 60 whose line-of-sight level is equal to or higher than a threshold value. If there is no viewer 60 whose line-of-sight level is equal to or higher than the threshold value (NO), the live streaming device 100 repeats the processes of steps S4 to S6. If there is a viewer 60 whose line-of-sight level is equal to or higher than the threshold value (YES), the live streaming device 100 issues an NFT for the viewer 60 whose line-of-sight level is equal to or higher than the threshold value in step S7.

[0046] The live streaming device 100 determines in step S8 whether the viewer 60 has purchased the NFT. If the viewer 60 has purchased the NFT (YES), the live streaming device 100 sets the purchasing viewer 60 as the owner in step S9 and transfers the process to step S10. If the viewer 60 has not purchased the NFT (NO), the live streaming device 100 transfers the process to step S10. Note that the issued NFT can be purchased even after the end of the live stream.

[0047] The live streaming device 100 determines in step S10 whether to end the distribution of the captured image. If the distribution of the captured image is not ended (NO), the live streaming device 100 repeats the processes of steps S4 to S8. If the distribution of the captured image is ended (YES), the live streaming device 100 ends the process.

[0048] When the control unit 2 is configured by the central processing unit of the computer device, the processes shown in FIG. 17 may be performed by the central processing unit executing a live streaming program that is a computer program.

[0049] The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. For example, although it has been described that any one of the captured images by the cameras 6a to 6c for video distribution is selected, all the videos of the cameras 6a to 6c for video distribution may be distributed so that the viewer 60 can select the videos of the cameras 6a to 6c for video distribution. Further, the viewer image of the viewer 60 of the additional image 282 of the NFT does not have to be the face image of the viewer 60 when the NFT is issued, and may be a face image of the viewer 60 captured in advance, an illustration showing the face or the like of the viewer 60, or a virtual image such as an avatar showing the viewer 60.

Explanation of Reference Numerals

[0050] 1 Communication unit 2 Control unit 3 Viewer information holding unit 4 Performer side monitor 5 Eye detection camera 6, 6a to 6c Cameras for video distribution 7 Microphone 21 Viewer image receiving unit 22 Monitor display control unit 23 Face detection unit 24 Eye detection unit 25 Eye level generation unit 26 Video distribution control unit 27 Distributed audio-video generation unit 28 Non-fungible token issuing unit 30 Network 40, 41 Performers 50, 50a to 50d Viewer terminals 100 Live distribution device 291 Expression detection unit (gesture detection unit) 292 Hand waving detection unit (gesture detection unit)

Claims

1. A distribution video generation unit that generates a distribution video to be distributed to a plurality of viewers based on a captured image of a performer captured by a camera for video distribution; A viewer image receiving unit that receives viewer images indicating the plurality of viewers; A monitor display control unit that controls to display the viewer image of each viewer on a performer-side monitor installed so as to be visible to the performer; A gaze detection unit that detects a gaze, which is the direction in which the performer looks at the performer-side monitor, based on a captured image of the performer captured by a camera for gaze detection; A gaze level generation unit that generates a gaze level indicating the degree to which the gaze of the performer is directed at each viewer among the plurality of viewers based on the gaze detected by the gaze detection unit; A non-fungible token issuance unit that issues a still image or a video of a predetermined time based on the distribution video when the gaze level for each viewer is equal to or higher than a threshold value as a non-fungible token; A live distribution device comprising the above.

2. The live distribution device according to claim 1, wherein the non-fungible token issuance unit adds a certificate proving that the gaze level is equal to or higher than the threshold value to the non-fungible token.

3. The live distribution device according to claim 1 or 2, wherein the non-fungible token issuance unit sets the price of the non-fungible token according to the gaze level.

4. Further comprising a gesture detection unit that detects a gesture of the performer, which is at least one of an expression on the face of the performer and a hand gesture of the performer, The non-fungible token issuance unit calculates the rarity of the non-fungible token based on at least the gaze level and the gesture of the performer detected by the gesture detection unit, and sets the price of the non-fungible token according to the calculated rarity. The live distribution device according to claim 1 or 2.

5. The distribution video generation unit generates the distribution video based on a captured image of two or more performers captured by the camera for video distribution, The gaze detection unit detects the gaze for each of the two or more performers, The gaze level generation unit generates a gaze level for each of the two or more performers indicating the degree to which the gaze of the two or more performers is directed at each viewer among the plurality of viewers based on the gaze of each of the two or more performers detected by the gaze detection unit. The non-fungible token issuing unit sets the price of the non-fungible token according to the line-of-sight level for each of the two or more speakers. The live distribution device according to claim 1 or 2.

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