JP7300294B2 - 3D image transmission system, 3D image transmission device and 3D image display device - Google Patents

Description

The present invention relates to a stereoscopic image transmission system, a stereoscopic image transmission device, and a stereoscopic image display device for transmitting a stereoscopic image group composed of stereoscopic images corresponding to a viewer's viewpoint.

Integral photography (IP: Integral Photography) is known as a stereoscopic video system that allows viewing freely from any viewpoint (for example, Patent Document 1 and Non-Patent Document 1). In this IP method, for example, a three-dimensional image of a subject 110 is captured by an imaging device 100 as shown in FIG. 9(a). As shown in FIG. 9A, at the time of photographing, the photographing apparatus 100 includes a photographing element lens group in which photographing element lenses 120 ₁ , 120 ₂ . . . , _{120 i ,} . A subject 110 is photographed via 120 . However, it is an integer that satisfies n>i>2. In the imaging device 100, an image of the subject ₁₁₀ (elemental images 140 ₁ , 140 ₂ , . . _. , 140 _i , . A group of 110 elemental images 140 are captured.

As shown in FIG. 9B, a display device 200 is used for display. The viewer W views the display element 150 displaying the elemental image group 140 photographing the subject 110 through the elemental lens group 160 composed of the elemental lenses _160i , _{1602 ,} . . . , _160i, . A three-dimensional image (stereoscopic reproduction image) 170 of the subject 110 can be viewed by viewing.

JP 2013-160808 A

Overview of 3D Television Research, Hiroshi Kikuchi, NHK Giken R&D, No.166, November 2017

Here, an IP stereoscopic image transmission system that provides the viewer with the above-described elemental image group will be examined. In the conventional IP stereoscopic image transmission system, since elemental images with a huge amount of data are transmitted at the same transmission rate, there is a problem that the transmission load increases. On the other hand, in the conventional IP stereoscopic image transmission system, when the transmission rate is lowered, although the transmission load can be reduced, the quality of the elemental images is degraded. In other words, in the conventional IP stereoscopic image transmission system, it was difficult to reduce the transmission rate of the elemental images while suppressing quality deterioration of the elemental images.

Accordingly, it is an object of the present invention to provide a stereoscopic image transmission system, a stereoscopic image transmission device, and a stereoscopic image display device capable of suppressing quality deterioration of stereoscopic images while reducing the transmission rate of stereoscopic images.

In view of the above problems, a stereoscopic image transmission system according to the present invention provides a stereoscopic image display device that displays a stereoscopic image group composed of stereoscopic images corresponding to each viewpoint, and transmits the stereoscopic image group to the stereoscopic image display device. and a stereoscopic image transmission device.

The stereoscopic image display device includes a decoding unit that receives a stereoscopic image group from the stereoscopic image transmission device and decodes the received stereoscopic image group, a display unit that displays the stereoscopic image group decoded by the decoding unit, and a viewer's viewing position. and a detection unit that detects the viewing position and transmits the detected viewing position to the stereoscopic image transmission device.

Further, the stereoscopic image transmission device receives the viewing position from the stereoscopic image display device, and calculates the angle formed between the display screen and the direction from the received viewing position to each viewpoint position preset on the display screen. a control unit that lowers the transmission rate of a stereoscopic image corresponding to a viewpoint with a smaller angle than the transmission rate of another stereoscopic image that corresponds to a viewpoint with a larger angle; and an encoding unit that transmits the image group to the stereoscopic image display device.

In other words, the 3D image transmission system utilizes the fact that the strobe effect decreases as the moving angular velocity of an object decreases, and transmits 3D images corresponding to viewpoints where the angle between the viewing position and each viewpoint position on the display screen becomes small. lower the rate.

The present invention can be realized by the stereoscopic image transmission device or the stereoscopic image display device provided in the stereoscopic image transmission system described above.

According to the present invention, it is possible to reduce the quality deterioration of stereoscopic images while reducing the transmission rate of stereoscopic images. .

(a) and (b) are explanatory diagrams for explaining the principle of the present invention. 1 is a schematic configuration diagram of a stereoscopic image transmission system according to a first embodiment; FIG. 1 is a block diagram showing the configuration of a stereoscopic image transmission system according to a first embodiment; FIG. (a) and (b) are explanatory diagrams for explaining a first example of frame rate control in the first embodiment. (a) and (b) is explanatory drawing explaining the correspondence of the angle|corner to form, and a frame rate in 1st Embodiment. (a) and (b) are explanatory diagrams for explaining a second example of frame rate control in the first embodiment. 4 is a flow chart showing the operation of the stereoscopic image transmission system according to the first embodiment; FIG. 11 is an explanatory diagram for explaining transmission rate control in the second embodiment; (a) and (b) are explanatory diagrams for explaining the prior art.

Hereinafter, after explaining the principle of the present invention, each embodiment of the present invention will be explained in detail. In addition, in each embodiment, the same code|symbol was attached|subjected to the same means, and description was abbreviate|omitted.

(Principle of the present invention)
The principle of the present invention will be described with reference to FIG.
As shown in FIG. 1A, consider a case where a viewer W is positioned in front of a display screen 90 of a general display, and the viewer W faces the center of the display screen 90 . In this case, the angle ? That is, at the center of the display screen 90, the formed angle θ _C increases, while at the right end of the display screen 90, the formed angle θ _R decreases.

Consider the case where the object 91 is moving on the image displayed on the display screen 90 . In this case, as shown in FIG. 1B, the moving speed of the object 91 (moving angular velocity ω ) becomes smaller.

Here, when the object 91 is moving on the display screen 90, the object 91 may appear multiple. This phenomenon is called a strobe effect, and is a factor that degrades the subjective quality of video media such as television (see Reference 1). It is known that this strobe effect occurs due to the relationship between the moving angular velocity ω of the object 91 and the frame rate (transmission rate). As the moving angular velocity ω of the object 91 decreases, the frame rate at which the strobe effect occurs decreases. That is, if the moving angular velocity ω of the object 91 is small, the strobe effect is less likely to occur even if the frame rate is lowered.

Reference 1: “Subjective evaluation of jerkiness using imaging frame frequency and aperture ratio as parameters”, Omura et al., Institute of Image Information and Television Engineers Technical Report, 2009, Vol. 6

Therefore, the stereoscopic image transmission system 1 (FIG. 2) uses the fact that the stroboscopic effect is reduced when the movement angular velocity ω of the object 91 is reduced, and the angle θ between the viewing position of the viewer W and each viewpoint position on the display screen reduces the frame rate of the elemental image corresponding to the viewpoint for which . As a result, the stereoscopic image transmission system 1 can suppress quality deterioration of the element images while reducing the frame rate of the element images.

(First embodiment)
[Overall Configuration of Stereoscopic Image Transmission System]
The overall configuration of the stereoscopic image transmission system 1 will be described with reference to FIG.
As shown in FIG. 2, a stereoscopic image transmission system 1 transmits a group of IP-based element images (a group of stereoscopic images) from a stereoscopic image transmission device 2 to a stereoscopic image display device 3. , and a stereoscopic image display device 3 . In this embodiment, it is assumed that the stereoscopic image transmission device 2 and the stereoscopic image display device 3 are connected via a network such as the Internet.

The stereoscopic image transmission device 2 stores in advance an elemental image group composed of elemental images corresponding to each viewpoint, and transmits the stored elemental image group to the stereoscopic image display device 3 via a network. At this time, the stereoscopic image transmission device 2 receives the viewing position of the viewer W from the stereoscopic image display device 3, and controls the frame rate of each elemental image based on the received viewing position. For example, the stereoscopic image transmission device 2 is a network distribution server including means (FIG. 3) to be described later.

The stereoscopic image display device 3 receives the elemental image group from the stereoscopic image transmission device 2 via the network, and displays the received elemental image group on the display screen 35a. For example, the stereoscopic image display device 3 is an IP stereoscopic image display device that includes an element lens group 32 in which element lenses 31 are arranged in two-dimensional directions, as in the prior art. In the stereoscopic image display device 3, a viewing position detection unit 33 for detecting the viewing position of the viewer W is arranged above the display.

[Configuration of Stereoscopic Image Transmission Device]
The configuration of the stereoscopic image transmission device 2 will be described with reference to FIG.
As shown in FIG. 3 , the stereoscopic image transmission device 2 includes an element image group storage section 21 , a transmission rate control section (control section) 22 and an encoding section 23 .

The elemental image group storage unit 21 is a storage device such as a memory or HDD (Hard Disk Drive) that stores a desired elemental image group in advance. This elemental image group storage unit 21 is referred to by a transmission rate control unit 22, which will be described later.

The transmission rate control unit 22 receives the viewing position from the stereoscopic image display device 3, and calculates the angle θ between the received viewing position and each viewpoint position preset on the display screen 35a. Thus, from the viewing position received from the stereoscopic image display device 3, the relative positional relationship (angle θ) between the viewing position of the viewer W and each viewpoint position on the display screen 35a can be obtained. Therefore, the transmission rate control unit 22 controls the frame rate by utilizing the fact that the strobe effect is reduced as described above. Specifically, the transmission rate control unit 22 makes the transmission rate of a stereoscopic image corresponding to a viewpoint with a small angle θ lower than the transmission rate of other stereoscopic images corresponding to a viewpoint with a large angle θ. In other words, the transmission rate control unit 22 makes the frame rate of other elemental images corresponding to viewpoints with a large angle θ higher than the frame rate of elemental images corresponding to viewpoints with a small angle θ.
After that, the transmission rate control unit 22 outputs the element image group whose frame rate is controlled to the encoding unit 23 via the network.

The encoding unit 23 encodes the elemental image group input from the transmission rate control unit 22, and transmits the encoded elemental image group to the stereoscopic image display device 3 via the network. That is, the encoding unit 23 encodes the elemental image group whose frame rate is controlled, and transmits a stream of the elemental image group.

The encoding unit 23 can use any encoding method. Further, since the element images are highly correlated with each other and have a lot of redundancy, the encoding unit 23 preferably uses an encoding method that predicts each element image with respect to the other. Thereby, the encoding unit 23 can fully utilize the high correlation and improve the encoding efficiency.
Furthermore, the encoding unit 23 may use a hierarchical encoding method that gives a layered structure to the compressed stream.

[Configuration of stereoscopic image display device]
The configuration of the stereoscopic image display device 3 will be described with reference to FIG.
As shown in FIG. 3 , the stereoscopic image display device 3 includes a viewing position detection section (detection section) 33 , a decoding section 34 and a display section 35 .

The viewing position detection unit 33 detects the viewing position of the viewer W, and transmits the detected viewing position to the stereoscopic image transmission device 2 via the network. Here, the viewing position detection unit 33 detects the viewing position of the viewer W in real time while the stereoscopic image display device 3 is displaying the stereoscopic image. Also, the viewing position detection unit 33 can use any viewing position detection method. For example, the viewing position detection unit 33 may be a distance measuring sensor (infrared sensor) or a stereo camera.

The decoding unit 34 receives the elemental image group from the stereoscopic image transmission device 2 via the network, and decodes the received elemental image group. Here, the decoding unit 34 decodes the elemental image group using a decoding method compatible with the encoding unit 23 . Then, the decoding unit 34 outputs each decoded element image to the display unit 35 .

The display unit 35 displays the elemental image group input from the decoding unit 34 on the display screen 35a (FIG. 2). At this time, since the frame rate of each elemental image input from the decoding unit 34 is different, the display unit 35 may perform synchronization processing so that the elemental images are displayed at the same time.

<Frame rate control>
Frame rate control by the transmission rate control unit 22 will be described in detail with reference to FIGS. 4 to 6. FIG.
In addition, in FIG. 4, in order to simplify the explanation, it is assumed that there are three viewpoints S only in the horizontal direction (right viewpoint S _R , center viewpoint S _C , and left viewpoint S _L ). In reality, viewpoints S exist not only in the horizontal direction but also in the vertical direction, and the number of viewpoints is not limited to three.

FIG. 4A shows an elemental image F _R corresponding to the right viewpoint S _R , an elemental image F _C corresponding to the central viewpoint _SC , and an elemental image _FL corresponding to the left viewpoint S _L . In each elemental image F ( _FR , _FC , _FL ), a cylindrical object 91 is photographed at a position corresponding to each viewpoint S ( _SR , _SC , _SL ). That is, the viewer W sees one element image F corresponding to each viewpoint S among the three element images F corresponding to each viewpoint S. FIG. Note that the symbol t in FIG. 4A represents the time axis.
FIG. 4B shows the positional relationship between the viewing position of the viewer W and the display screen 35a. In the example of FIG. 4, it is assumed that the viewing position of the viewer W is on the left side (left viewpoint S _L ) of the display screen 35a.

First, the transmission rate control unit 22 calculates the angle θ formed for each viewpoint S. That is, the transmission rate control unit 22 calculates the angles θ _R , _{θ C} , and θ _L formed by the viewpoints SR, _SC , and _SL , respectively. As shown in FIG. 4B, the angle _θL formed by the left viewpoint _SL is the largest. The angle θ formed is 90°, which is the maximum value in front of the viewer W. Also, the angle θ _C formed by the center viewpoint S _C is the second largest, and the angle θ _R formed by the right viewpoint S _R is the smallest.

Further, the transmission rate control unit 22 presets the correspondence between the angle θ and the frame rate. For example, the transmission rate control unit 22 can arbitrarily set the correspondence relationship between the angle θ and the frame rate, such as a linear function as shown in FIG. 5(a) or a step function as shown in 5(b). .

Next, the transmission rate control unit 22 controls the frame rate of the elemental image F based on the correspondence. Here, two methods of controlling the frame rate will be described. A first control method is a method of gradually lowering the frame rate of each elemental image according to the angle θ formed. A second control method is a method of equally reducing the frame rate of element images other than the element image having the maximum angle θ.

<<First Control Method>>
The first control method will be described below.
As shown in FIG. 4A, the transmission rate control unit 22 makes the frame rate of the elemental image _FR lower than the frame rate of the elemental image _FC corresponding to the central viewpoint _SC . Also, the transmission rate control unit 22 makes the frame rate of the elemental image _FC corresponding to the central viewpoint _SC lower than the frame rate of the elemental image _FL corresponding to the left viewpoint _SL . That is, the frame rate of the element image _FL corresponding to the left viewpoint _SL is the highest. Also, the frame rate of the elemental image _FC corresponding to the central viewpoint _SC is the second highest, which is half the frame rate of the elemental image _FL . Also, the frame rate of the elemental image _FR corresponding to the right viewpoint _SR is the lowest, which is ¼ of the frame rate of the elemental image _FL .

<<Second control method>>
The second control method will be described below.
As shown in FIG. 6, the transmission rate control unit 22 equally reduces the frame rates of the element images _{FC and FR other} than the element image _FL corresponding to the left viewpoint _SL . Therefore, the frame rate of the element image _{FC corresponding to the central viewpoint SC and} the element image _FR corresponding to the right viewpoint _SR is 1/4 of the frame rate of the element image _FL .

The transmission rate control unit 22 is set in advance as to which of the first control method and the second control method is to be used. For example, the first control method is set when the quality of the elemental image is important, and the second control method is set when the transmission efficiency of the elemental image is important.

[Operation of stereoscopic image transmission system]
The operation of the stereoscopic image transmission system 1 will be described with reference to FIG.
As shown in FIG. 7, in step S1, the viewing position detection unit 33 of the stereoscopic image display device 3 detects the viewing position of the viewer W, and transmits the detected viewing position to the stereoscopic image transmission device 2 via the network. Send.

In step S2, the transmission rate control unit 22 of the stereoscopic image transmission device 2 receives the viewing position from the stereoscopic image display device 3, and calculates the angle θ between the received viewing position and each viewpoint position on the display screen 35a. Then, the transmission rate control unit 22 makes the frame rate of the elemental image corresponding to the viewpoint S with the smaller angle θ lower than the frame rate of the other elemental images.

In step S3, the encoding unit 23 of the stereoscopic image transmission device 2 encodes the elemental image group whose frame rate is controlled in step S2, and transmits the encoded elemental image group to the stereoscopic image display device 3 via the network. Send.
In step S4, the decoding unit 34 of the stereoscopic image display device 3 receives the elemental image group from the stereoscopic image transmission device 2 via the network, and decodes the received elemental image group.
In step S5, the display unit 35 of the stereoscopic image display device 3 displays the element image group decoded in step S4 on the display screen 35a.

[Action/effect]
As described above, the stereoscopic image transmission system 1 utilizes the fact that the strobe effect is reduced when the moving angular velocity ω of the object 91 is reduced, and supports the viewpoint S where the angle θ between the viewing position and the display screen 35a is reduced. Decrease the frame rate of elemental images. In this way, the stereoscopic image transmission system 1 can suppress quality deterioration of the element images while reducing the frame rate of the element images. Images can be transmitted efficiently.

(Second embodiment)
[Structure of stereoscopic image transmission system]
With reference to FIG. 3, the configuration of the stereoscopic image transmission system 1B will be described with respect to the differences from the first embodiment.
In the first embodiment, the number of viewers W is one, but in the second embodiment, the number of viewers W is plural. Therefore, the stereoscopic image display device 3B detects the viewing positions of the plurality of viewers W. FIG.

As shown in FIG. 3, the stereoscopic image transmission system 1B includes a stereoscopic image transmission device 2B and a stereoscopic image display device 3B.
The stereoscopic image transmission device 2B includes an element image group storage unit 21, a transmission rate control unit (control unit) 22B, and an encoding unit .
The stereoscopic image display device 3B includes a viewing position detection section (detection section) 33B, a decoding section 34, and a display section 35B.

First, the stereoscopic image display device 3B will be described first, and then the stereoscopic image transmission device 2B will be described.
The viewing position detection unit 33B detects a viewing position for each viewer W when there are a plurality of viewers W. FIG. Then, the viewing position detection unit 33B transmits the detected viewing position of each viewer W to the stereoscopic image transmission device 2B via the network. Note that the method of detecting the viewing position is the same as in the first embodiment, so further explanation will be omitted.
The display unit 35B displays elemental images with different transmission rates for each pixel. For example, the display section 35B may be an LED array in which pixels are composed of LEDs (Light Emitting Diodes).

The transmission rate control unit 22B calculates the angle θ formed for each viewer W, and makes the angle θ smaller than the transmission rate of the other elemental images corresponding to the viewpoint at which the angle θ formed by any viewer W becomes large. The transmission rate of element images corresponding to different viewpoints is lowered.

<Transmission rate control>
The transmission rate control by the transmission rate control unit 22B will be described in detail with reference to FIG.
In addition, in FIG. 8, in order to simplify the explanation, it is assumed that there are three viewpoints S in the horizontal direction (right viewpoint S _R , center viewpoint S _C , and left viewpoint S _L ).
In the example of FIG. 8, the viewers W _L and W _R are positioned on the left and right sides of the display screen 35a, respectively.

Here, the viewing position of the left viewer W _L is the left side (left viewpoint S _L ) of the display screen 35a. Therefore, for the viewer _WL on the left side, the angle θ formed by the left viewpoint _SL is maximized. On the other hand, the viewing position of the viewer W _R on the right side is the right side (right viewpoint S _R ) of the display screen 35a. Therefore, for the viewer W _R on the right side, the angle θ formed by the right viewpoint S _R is maximum. In this case, the transmission rate control unit 22B sets the transmission rate of the elemental image corresponding to the center viewpoint _SC to the viewpoints _SL and _SR at which the angles θ formed by the viewers W _L and W _R are maximized. It should be lower than the transmission rate of the elemental images _FL and _FR .

Pixels on the display screen 35a viewed from a plurality of viewers W _L and W _R (that is, pixels viewed through the same element lens) correspond to different pixels in the same element image F. Therefore, if the transmission rate control unit 22B controls the transmission rate for each pixel of the element image F, it can handle a plurality of viewers _WL and _WR . For example, from the positional relationship between the display section _35B and the viewers WL and _WR , it can be known which pixel of each element image F the viewers _WL and _WR are gazing. Therefore, the transmission rate control unit 22B may control the frame rate according to the angle θ formed with respect to the pixels watched by the viewers W _L and W _R .

[Action/effect]
As described above, even when there are a plurality of viewers W, the stereoscopic image transmission system 1B can reduce the transmission rate of the elemental images and suppress quality deterioration of the elemental images, as in the first embodiment. As a result, the stereoscopic image transmission system 1B can reduce the amount of computation for the encoding process and the transmission band, and efficiently transmit elemental images with a huge amount of data.

(Modification)
Although the respective embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described respective embodiments, and includes design changes and the like within the scope of the present invention.
In each of the above-described embodiments, the stereoscopic image display device synchronously displays elemental images of viewpoints with different frame rates, but the present invention is not limited to this. For example, the stereoscopic image display device may interpolate elemental images of viewpoints with a low frame rate in the time direction.

In each of the above-described embodiments, the viewing position detection unit detects the viewing position of the viewer, but the present invention is not limited to this. For example, if the object that the viewer is gazing at is moving, its line-of-sight direction is considered to change. Also, it is considered that the stroboscopic effect differs depending on whether it is near the center of the viewer's field of view or in the periphery of the field of view. Therefore, the viewing position detection unit may detect the direction of the viewer's line of sight in addition to the viewing position of the viewer. Then, the transmission rate control unit may control the transmission rate taking into account the line-of-sight direction of the viewer.

In each of the above-described embodiments, the IP method is applied, but the present invention is not limited to this. For example, the present invention can also be applied to a three-dimensional method, such as a lenticular method, which has the same principle as the IP method.

In each of the above-described embodiments, the correspondence relationship between the formed angle and the frame rate has been described as being set by a linear function or a step function, but the present invention is not limited to this. For example, Reference 2 below describes the subjective quality relationship between the moving angular velocity of an object and the frame rate. According to Reference 2, the quality improvement effect is high when the movement angular velocity is 20 to 25 deg/s, and the quality improvement effect is low when the movement angular velocity is slower or faster than that range. Therefore, in the transmission rate control unit, a correspondence relationship is established in which the frame rate is high at angles corresponding to a movement angular velocity within a predetermined range (for example, 20 to 25 deg/s), and the frame rate is low at other angles. You can set it. Here, the angular velocity of movement as seen by the viewer is determined from the relationship between the angular velocity of movement on the display screen and the angle formed. Then, the relationship between the formed angle and subjective quality is determined from the relationship between moving angular velocity and subjective quality. Higher frame rates improve subjective quality, so you can set the correspondence between angles and frame rates.

Reference 2: “Effect of Improving Motion Picture Quality of High Frame Rate Imaging Television System”, Emoto et al., Institute of Image Information and Television Engineers, Vol. 65, No. 8, pp. 1208-1214, 2011

In each of the above-described embodiments, the stereoscopic image display device has been described as a stationary type, but the stereoscopic image display device is not limited to this. That is, according to the present invention, the stereoscopic image display device may move as long as the relative positional relationship between the stereoscopic image display device and the viewer can be obtained. In this case, a tablet-type stereoscopic image display device that can be carried by the viewer is used.

Although each of the above-described embodiments has been described as having one stereoscopic image display device, the stereoscopic image transmission system may include a plurality of stereoscopic image display devices. In this case, the stereoscopic image transmission device controls the frame rate for each stereoscopic image display device based on the viewing position transmitted from the stereoscopic image display device.

1, 1B Stereoscopic image transmission system 2, 2B Stereoscopic image transmission device 21 Elemental image group storage unit 22, 22B Transmission rate control unit (control unit)
23 encoding unit 3, 3B stereoscopic image display device 31 element lens 32 element lens group 33, 33B viewing position detection unit (detection unit)
34 decoding units 35, 35B display unit 35a display screen

Claims (6)

A stereoscopic image transmission system comprising: a stereoscopic image display device that displays a stereoscopic image group composed of stereoscopic images corresponding to each viewpoint; and a stereoscopic image transmission device that transmits the stereoscopic image group to the stereoscopic image display device. hand,
The stereoscopic image display device
a decoding unit that receives the stereoscopic image group from the stereoscopic image transmission device and decodes the received stereoscopic image group;
a display unit that displays the stereoscopic image group decoded by the decoding unit on a display screen;
a detection unit that detects a viewing position of a viewer and transmits the detected viewing position to the stereoscopic image transmission device;
The stereoscopic image transmission device,
receiving the viewing position from the stereoscopic image display device, calculating an angle between a direction from the received viewing position to each viewpoint position preset on the display screen and the display screen , and calculating the calculated angle a controller for lowering the transmission rate of a stereoscopic image corresponding to a viewpoint with a smaller angle than the transmission rate of another stereoscopic image corresponding to a viewpoint with a larger angle;
and an encoding unit that encodes the stereoscopic image group and transmits the encoded stereoscopic image group to the stereoscopic image display device. 2. The stereoscopic image transmission system according to claim 1, wherein the control unit controls the transmission rate of the stereoscopic image group based on a preset correspondence relationship between the formed angle and the transmission rate. 3. The stereoscopic image transmission system according to claim 1, wherein the stereoscopic image group is an elemental image group composed of integral type elemental images. When the number of viewers is plural, the detection unit detects the viewing position for each viewer,
The control unit calculates the angle for each of the viewers, and a viewpoint with a smaller angle than a transmission rate of another stereoscopic image corresponding to a viewpoint with a larger angle for each of the viewers. 4. The stereoscopic image transmission system according to any one of claims 1 to 3, wherein the transmission rate of stereoscopic images corresponding to . Used in a stereoscopic image transmission system comprising a stereoscopic image display device for displaying a stereoscopic image group composed of stereoscopic images corresponding to each viewpoint, and a stereoscopic image transmission device for transmitting the stereoscopic image group to the stereoscopic image display device The stereoscopic image transmission device,
A viewing position of a viewer is received from the stereoscopic image display device, and an angle between a direction from the received viewing position to each viewpoint position preset on a display screen of the stereoscopic image display device and the display screen is calculated. a control unit for lowering the transmission rate of the stereoscopic image corresponding to the calculated viewpoint with the smaller angle than the transmission rate of the other stereoscopic image corresponding to the viewpoint with the larger angle;
and an encoding unit that encodes the stereoscopic image group and transmits the encoded stereoscopic image group to the stereoscopic image display device. Used in a stereoscopic image transmission system comprising a stereoscopic image display device for displaying a stereoscopic image group composed of stereoscopic images corresponding to each viewpoint, and a stereoscopic image transmission device for transmitting the stereoscopic image group to the stereoscopic image display device The stereoscopic image display device,
a decoding unit that receives the stereoscopic image group from the stereoscopic image transmission device and decodes the received stereoscopic image group;
a display unit that displays the stereoscopic image group decoded by the decoding unit on a display screen;
a detection unit that detects a viewing position of a viewer and transmits the detected viewing position to the stereoscopic image transmission device;
The stereoscopic image group received and decoded by the decoding unit is a stereoscopic image corresponding to a viewpoint having a small angle between the display screen and a direction from the viewing position to each viewpoint position preset on the display screen. A stereoscopic image display device, wherein a transmission rate of an image is lower than a transmission rate of another stereoscopic image corresponding to a viewpoint with a large angle.

Images