KR101293063B1 - Terminals, server for controlling video calling, system and method for video calling using the same - Google Patents

Abstract

PURPOSE: A terminal, a videotelephony control server, and a videotelephony system using the same and a method thereof are provided to enable videotelephony users in each video to receive a synthesized video displayed along the reference direction, when videotelephony is performed, by making each terminal photograph a user from different postures. CONSTITUTION: A terminal (202) transmits an image of photographing a videotelephony user to a videotelephony control server (204). The videotelephony control server synthesizes images transmitted from more than one terminal, and transmits the synthesized images to the terminal. The videotelephony control server rotates each image according to the posture information sensed in each terminal, and synthesizes each image to the synthesized image. [Reference numerals] (204) Video telephony control server; (AA) Posture information and photographed image; (BB) Synthesized image

Description

Terminal, video call control server, and video call system and method using same {TERMINALS, SERVER FOR CONTROLLING VIDEO CALLING, SYSTEM AND METHOD FOR VIDEO CALLING USING THE SAME}

An embodiment of the present invention relates to a video call technology, and more particularly, to a terminal, a video call control server, and a video call system and method using the same, allowing each user to view a video screen in the same direction as a reference posture. It is about.

Recently, with the development of information and communication technology, not only voice communication but also video communication have become possible through a portable terminal. The video call service is a service for taking a video of a user through a camera attached to the portable terminal and transmitting the video to the partner portable terminal so that they can talk while watching each other's faces.

The video call service may be classified into a one-to-one video call between a caller and a called party and a multiparty video call. Here, the multi-party video call is mainly made through a control device called a MCU (Multipoint Control Unit). The MCU is a device that receives a voice and a video transmitted by each mobile terminal, synthesizes a plurality of voices and videos into a single voice and video, and transmits them to each mobile terminal.

1 is a view showing a video call system using a conventional multipoint control unit (MCU).

Referring to FIG. 1, in the conventional video call system, the MCU 20 synthesizes the images (a, b, c, d) transmitted by each of the mobile terminals 11, 12, 13, and 14, and then synthesizes them. Since the captured image I is transferred to each of the portable terminals 11, 12, 13, and 14, the image in the image I synthesized according to the posture of the respective portable terminals 11, 12, 13, and 14 ( a, b, c, d) can have different postures.

For example, the mobile terminal 11 and the mobile terminal 14 are photographed in a state rotated 90 degrees clockwise from the reference posture, and the mobile terminal 12 and the mobile terminal 13 are taken in the reference posture In this case, the image (a) and the image (d) taken by the portable terminal 11 and the portable terminal 14 are synthesized by the MCU 20 rotated at an angle of 90 degrees counterclockwise, respectively, 12) and the image (b) and the image (c) taken by the mobile terminal 13 is synthesized by the MCU 20 in a reference posture.

In this case, when the user of each of the mobile terminals 11, 12, 13, 14 sees the synthesized image I, the images a and d are counterclockwise in the synthesized image I. Since it appears to be lying 90 degrees, it is inconvenient to feel the heterogeneity and see the screen during a video call.

Embodiments of the present invention are to provide a terminal, a video call control server, and a video call system and method using the same so that each video call user is displayed in the shot image while maintaining the reference direction in the shot image even if the terminal is rotated. .

According to an embodiment of the present invention, a video call system includes: a terminal for transmitting an image of a video call user; And a video call control server configured to form a synthesized video obtained by synthesizing images transmitted by one or more terminals, and to transmit the synthesized video to the terminal, wherein each of the images is rotated according to the posture information detected by the terminal. And to be synthesized with the synthesized image.

According to an aspect of the present invention, there is provided a video call method comprising: transmitting, at a terminal, a video photographing a video call user; Forming a synthesized video obtained by synthesizing images transmitted from one or more terminals in a video call control server; And transmitting, at the video call control server, the synthesized image to the terminal, wherein each image constituting the synthesized image is rotated and synthesized according to posture information detected by the terminal.

On the other hand, the video call control server according to an embodiment of the present invention, the communication unit for receiving the posture information of each terminal and the image of the user from one or more terminals, according to the posture information of the images received by the communication unit An image rotating unit that rotates an image requiring rotation to a reference position to a reference position, and an image that does not need to rotate to the reference position among images received by the communication unit and the image rotating unit among images received by the communication unit. And a synthesized image forming unit for synthesizing the rotated images in the reference posture to form a synthesized image. The communication unit transmits the synthesized image to each terminal.

On the other hand, the video call control server according to another embodiment of the present invention, the communication unit for receiving a video of the video call user from one or more terminals, the image analysis unit for detecting the screen mode of each terminal from the received image, and And a synthesized image forming unit configured to synthesize the received images according to the detected screen mode of each terminal to form a synthesized image. The communication unit transmits the synthesized image to the corresponding terminal.

On the other hand, the terminal according to an embodiment of the present invention, a photographing unit for photographing a video call user, a posture information sensing unit for detecting a rotated state from a preset reference pose of the terminal, the photographing according to the rotated state An image rotating unit for rotating the additionally captured image, and a video call unit for transmitting the image captured by the photographing unit or the image rotated by the image rotating unit.

According to embodiments of the present invention, even if each terminal makes a video call by photographing the user in a different posture, the video call users in each video can receive the composite video indicated in the reference direction from the video call control server. . In this case, the users of each terminal can perform the video call without the discomfort and inconvenience caused by the image of the other users appear to be rotated.

1 is a view showing a video call system using a conventional multipoint control unit (MCU).
2 is a view showing a video call system according to a first embodiment of the present invention.
3 is a view showing a rotated state from a reference pose of the terminal according to the first embodiment of the present invention.
4 is a view illustrating a state in which a video call control server rotates an image using posture information transmitted from each terminal and then forms a composite image in the video call system according to the first embodiment of the present invention.
5 is a diagram showing the configuration of a video call control server according to a first embodiment of the present invention.
6 is a flowchart illustrating a video call method according to a first embodiment of the present invention.
7 is a view showing a video call system according to a second embodiment of the present invention.
8 is a view illustrating a state in which a terminal is rotated by 90 degrees clockwise from a reference posture and a state in which a terminal is rotated in a reference posture according to a second embodiment of the present invention.
9 is a diagram illustrating a state in which a video call control server according to a second embodiment of the present invention forms a composite video from images transmitted from each terminal.
10 is a diagram showing the configuration of a terminal according to a second embodiment of the present invention.
11 is a diagram showing the configuration of a video call control server according to a second embodiment of the present invention.
12 is a flowchart illustrating a video call method according to a second embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, this is merely an example and the present invention is not limited thereto.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

The technical idea of the present invention is determined by the claims, and the following embodiments are merely a means for effectively explaining the technical idea of the present invention to a person having ordinary skill in the art to which the present invention belongs.

According to an embodiment of the present invention, a video call system includes a terminal for transmitting an image of a video call user, and a synthesized image obtained by synthesizing images transmitted by one or more terminals, and transmitting the synthesized image to the terminal. It includes a video call control server. In this case, the images are rotated according to the posture information detected by the terminal and synthesized into the composite image.

In one embodiment, the terminal may be configured to transmit the posture information to the video call control server. In this case, the video call control server may rotate the image received from the terminal to a reference posture according to the received posture information, and synthesize the rotated video to form the synthesized video.

The terminal may transmit the aspect ratio information of the terminal together with the posture information to the video call control server. In addition, when the posture of the terminal is changed after transmitting the posture information, the terminal may transmit posture information corresponding to the changed posture to the video call control server.

In another embodiment of the present invention, the terminal may detect posture information, and rotate the captured image according to the detected posture information to a reference posture and transmit the posture information to the video call control server. In addition, when the posture of the terminal is changed after the posture information is transmitted, the terminal may rotate and transmit the captured image to the video call control server according to the posture information corresponding to the changed posture.

In this case, the video call control server may check the screen mode of the terminal through the image transmitted from the terminal, form the composite image according to the screen mode, and transmit the image to the terminal. The video call control server may check the aspect ratio of the terminal together with the screen mode from the image received from the terminal, form the composite image according to the screen mode and the aspect ratio, and transmit the same to the terminal. .

On the other hand, the video call method according to the embodiments of the present invention, the step of transmitting the image of the video call user in the terminal, in the video call control server, to form a composite image synthesized by the images transmitted from one or more terminals And transmitting, at the video call control server, the synthesized image to the terminal, wherein each image constituting the synthesized image is rotated and synthesized according to posture information detected by the terminal.

In an embodiment, the transmitting of the video may further include transmitting posture information of the terminal to the video call control server. In this case, in the forming of the synthesized image, the image received from the terminal may be rotated to a reference posture according to the received posture information, and the rotated image may be synthesized to form the synthesized image.

The transmitting of the video may further include transmitting aspect ratio information of the terminal together with the posture information to the video call control server.

Meanwhile, when the posture of the terminal is changed after the posture information is transmitted, the terminal may transmit posture information corresponding to the changed posture to the video call control server.

In another embodiment of the present invention, the transmitting of the image comprises: detecting posture information of the terminal, and rotating the captured image according to the detected posture information to a reference posture to transmit the image to the video call control server. It may further comprise a step. In this case, when the posture of the terminal is changed after the posture information is transmitted, the terminal may rotate and transmit the captured image to the video call control server according to the posture information corresponding to the changed posture.

The forming of the composite image may further include checking a screen mode of the terminal through an image transmitted by the terminal, and forming the composite image according to the screen mode. The forming of the composite image may further include identifying a screen ratio of the terminal together with the screen mode from the image received from the terminal, and forming the composite image according to the screen mode and the aspect ratio. It may include.

Hereinafter, a specific embodiment of a video call system according to embodiments of the present invention configured as described above will be described.

2 is a view showing a video call system according to a first embodiment of the present invention.

Referring to FIG. 2, the video call system 200 according to the present embodiment includes a plurality of terminals 202 and a video call control server 204. Although four terminals 202 are illustrated here, the present invention is not limited thereto, and two or more terminals may be used for the terminal 202.

Each terminal 202 performs a video call request to the video call control server 704. In the present embodiment and the following embodiments, the terminal 202 may include any terminal capable of a video call, such as a portable terminal, a fixed terminal, a wireless terminal, a wired terminal. For example, it may be a terminal in the present invention, such as a mobile phone such as a smartphone, a PDA, a tablet, a laptop computer or a desktop computer. Here, the mobile terminal in the form of a mobile phone is illustrated as an example of the terminal 202, but is not limited thereto.

Each terminal 202 transmits its posture information to the video call control server 204 while performing a video call request to the video call control server 204. Here, the posture information refers to information indicating how much the terminal 202 is rotated from the reference posture.

3 is a view showing a rotated state from a reference pose of the terminal according to the first embodiment of the present invention. Referring to FIG. 3, each terminal 202 is rotated at an angle of 90 degrees clockwise from the reference pose (that is, rotated at an angle of 270 degrees counterclockwise from the reference pose) (FIG. 3 a), the state rotated 180 degrees clockwise from the reference position (the state rotated 180 degrees counterclockwise from the reference position) (b of FIG. 3), 270 degrees clockwise from the reference position It can be in the rotated state (the state rotated by 90 degrees counterclockwise from the reference posture) (Fig. 3c).

In this case, the rotation state of the terminal 202 is changed from a reference posture in units of 90 degrees (that is, 0 degrees, 90 degrees, 180 degrees, and 270 degrees), depending on how much the user rotates the terminal 202. You lose. In addition, since it is impossible to rotate the terminal at the correct angle due to the characteristics of the terminal 202 that the user directly holds in hand, the terminal 202 sets a threshold value of the rotation angle of the terminal in advance, and accordingly, rotates the terminal. You can change it. For example, when the rotation angle of the terminal 202 is -45 degrees or more and less than 45 degrees, the reference state, when 46 degrees or more and less than 135 degrees, rotated 90 degrees in the clockwise direction, 180 degrees in the clockwise direction when 135 degrees or more and less than 225 degrees In the rotated state, if it is more than 225 degrees and less than 315 degrees, it can be set to the state rotated 275 degrees clockwise.

In addition, the reference posture of the terminal 202 may vary according to the setting of the terminal 202 and the policy of the communication company. For example, the terminal screen may be positioned horizontally as the reference posture, or the vertical screen may be determined as the reference posture.

As such, each terminal 202 transmits its posture information to the video call control server 204 according to the rotated state from the reference posture. On the other hand, each terminal 202 transmits its posture information to the video call control server 204 after the posture information is changed, and transmits the posture information corresponding to the changed posture to the video call control server 204. .

In addition, each terminal 202 may transmit its reference aspect ratio information to the video call control server 204. Here, the reference aspect ratio information refers to information indicating the aspect ratio of the screen of the terminal 202 in the reference posture. For example, the aspect ratio of the screen of the terminal 202 in the reference posture may be 4: 3 or 16: 9, and each terminal 202 transmits the reference aspect ratio information to the video call control server 204. Can be. In this case, each terminal 202 may transmit its posture information and reference aspect ratio information using a Session Initiation Protocol (SIP) message.

Each terminal 202 transmits an image of the user to the video call control server 204. In this case, the image may be rotated at a predetermined angle from the reference posture according to the posture of each terminal 202 at the time of photographing. For example, if the terminal 202 is rotated 90 degrees clockwise from the reference posture when the user is photographed, the image of the user is rotated 90 degrees counterclockwise from the reference posture. Will appear.

When the video transmitted from each terminal 202 is rotated at a predetermined angle from the reference posture, the video call control server 204 rotates the corresponding video to become the reference posture, and then synthesizes each video by one. Form a composite image.

In detail, the video call control server 204 may check whether the image transmitted from each terminal 202 is rotated by a predetermined angle from the reference position based on the attitude information transmitted from each terminal 202. At this time, if the image transmitted by the predetermined terminal 202 is rotated by a predetermined angle from the reference pose, the video call control server 204 rotates the video again to become the reference pose. For example, when the image transmitted by the predetermined terminal 202 is rotated 90 degrees counterclockwise from the reference posture, the video call control server 204 rotates the image 90 degrees clockwise (or half). Rotate the image 270 degrees clockwise so that the image is in a reference position.

Then, all the images transmitted from each terminal 202 takes a reference posture. The video call control server 204 synthesizes the images taking the reference posture, forms a synthesized image, and then transmits the synthesized image to each terminal 202.

Here, when the reference aspect ratio information is transmitted from each terminal 202, the video call control server 204 forms a composite image at the aspect ratio corresponding to the reference aspect ratio information, and then transmits each to the corresponding terminal 202. Do it. For example, when the aspect ratio of the predetermined terminal 202 is 4: 3, the video call control server 204 forms a composite image so that the aspect ratio is 4: 3, and then transmits the synthesized image to the corresponding terminal 202. . When the aspect ratio of the predetermined terminal 202 is 16: 9, the video call control server 204 forms a composite image so that the aspect ratio is 16: 9 and then transmits the synthesized image to the corresponding terminal 202.

At this time, the video call control server 204 forms a corresponding number of composite images according to the type of the aspect ratio of each terminal 202, and then displays the composite image according to the aspect ratio of each terminal 202 in the corresponding terminal. And transmit to 202. For example, if the aspect ratio of each terminal 202 is two types, 4: 3 and 16: 9, the video call control server 204 has a 16: 9 aspect ratio and 16: 9 aspect ratio After the respective composite images are formed, the terminal 202 having an aspect ratio of 4: 3 is transmitted to the terminals 202 having an aspect ratio of 4: 3. Each of the composite images having a 16: 9 ratio can be transmitted.

In addition, when the video call control server 204 transmits the synthesized video to each terminal 202, after confirming the attitude information of each terminal 202, the video call control server 204 synthesizes the synthesized video at a screen ratio corresponding to the current posture of each terminal 202. Sends For example, when the aspect ratio of the terminal 202 is 4: 3, and the terminal 202 is in the state of the current reference posture, the video call control server 204 displays the composite video in the aspect ratio. The aspect ratio is 4: 3 and transmitted to the terminal 202. If the aspect ratio of the terminal 202 is 4: 3 and the terminal 202 is rotated 90 degrees clockwise from the reference posture, the video call control server 204 displays the composite video. After forming the aspect ratio of the aspect ratio to 3: 4, and transmits to the terminal 202.

According to an embodiment of the present invention, each terminal 202 transmits its posture information to the video call control server 204, and the video call control server 204 rotates at a predetermined angle from the reference posture using the posture information. By rotating the captured image back to the reference posture and forming a composite image, even though each terminal 202 photographs the user in a different posture and transmits the video, the images are taken from the video call control server 204. The composite image can be received. In this case, the users of each terminal 202 can perform a video call without the discomfort and inconvenience caused by the image of the other users in the rotated state.

4 is a view illustrating a state in which a video call control server rotates an image using posture information transmitted from each terminal and then forms a composite image in the video call system according to the first embodiment of the present invention.

Referring to FIG. 4, the terminal 202-1 transmits the image A captured in the reference posture to the video call control server 204, and the terminal 202-2 rotates 90 degrees clockwise from the reference posture. The image (B) taken in the normal state, the terminal (202-3) is taken in the state rotated 180 degrees clockwise from the reference position, the terminal (202-4) clockwise in the reference position The case where the images (D) taken in the state rotated 270 degrees to the video call control server 204, respectively, will be described. In this case, the image B, the image C, and the image D appear to be rotated by 90 degrees, 180 degrees, and 270 degrees in the counterclockwise direction, respectively. Here, each terminal 202-1, 202-2, 202-3, 202-4 has its own posture information and reference before transmitting the images A, B, C, and D to the video call control server 204. Aspect ratio information may be transmitted to the video call control server 204 in advance.

Then, the video call control server 204 uses the posture information received from each of the terminals 102-1, 102-2, 102-3, and 104-4 to obtain a video (B), a video (C), and a video (D). Is rotated 90 degrees, 180 degrees, and 270 degrees in the counterclockwise direction, respectively. In this case, the video call control server 204 rotates the image B, the image C, and the image D by 90 degrees, 180 degrees, and 270 degrees clockwise, respectively, to take a reference posture. After synthesizing the images A, B, C, and D to form a synthesized image, the synthesized image is transmitted to each of the terminals 202-1, 202-2, 202-3, and 202-4.

In this case, if the aspect ratio of each terminal 202-1, 202-2, 202-3, and 202-4 is 16: 9, respectively, the terminals 102-1 and 102-3 display the current screen. Since the ratio is 16: 9, the video call control server 204 forms the composite image I 'such that the aspect ratio of the screen is 16: 9, and then displays the composite image I' at the terminal 102. -1, 102-3). On the other hand, since the terminals 102-2 and 102-4 currently have a screen of 9:16, the video call control server 204 displays the composite video I '' such that the aspect ratio of the screen becomes 9:16. After the formation, the composite image I ″ is transmitted to the terminals 102-2 and 102-4.

Here, each of the images A, B, C, and D in the composite image I 'and the composite image I''has the same aspect ratio as the original image. However, the present invention is not limited thereto, and each of the images A, B, C, and D in the composite image I ′ and the composite image I ″ may include at least one of an aspect ratio and a screen size of the original image. The image may be processed differently and synthesized. For example, when each of the images A, B, C, and D has the same aspect ratio as the original image in the composite image I ', the left and right sides of the images B and D in the composite image I' are the same. In the case of the composite image I '', an empty space is formed above and below the images A and C. In order to solve this problem, the aspect ratio and the screen size of the image may be adjusted and synthesized so that no blank space is generated in the synthesized images I 'and I''. For example, in the composite video I ', the video call user cuts and resizes the top and bottom of the images B and D so that the face occupies the entire screen, or in the case of the composite video I'', The left and right sides of the image (A, C) can be cropped. In addition, when a part of the image is cut out during screen synthesis, the face in the image may be recognized so that the face of the person may not be cut off. Since image recognition technology is well known in the art to which the present invention pertains, a detailed description thereof will be omitted.

5 is a diagram showing the configuration of a video call control server according to a first embodiment of the present invention. Referring to FIG. 5, the video call control server 204 includes a communication unit 500, a storage unit 502, an image rotating unit 504, and a composite image forming unit 506.

The communication unit 500 receives posture information and an image of a user of the terminal 202 from each terminal 202. The communicator 500 may receive reference aspect ratio information from each terminal 202. In addition, the communication unit 500 transmits the composite image formed by the composite image forming unit 506 to each terminal 202.

The storage unit 502 stores posture information and captured images of each terminal 202 received by the communication unit 500. The storage unit 502 may store reference aspect ratio information of each terminal 202 received by the communication unit 500.

The image rotating unit 504 uses the posture information of each terminal 202 to determine whether there is an image that requires rotation in a reference posture among the images transmitted by each terminal 202. If there is an image that needs to be rotated to the reference position, the image rotating unit 504 rotates the image so that the image takes the reference position.

The composite image forming unit 506 does not need to rotate to the reference posture among the images received from each terminal 202 (that is, the image that has already taken the reference posture) and the image received from each terminal 202. The image rotated to the reference posture by the rotating unit 504 is synthesized to form a synthesized image. In this case, the composite image shape unit 506 may form the composite image at the aspect ratio corresponding to the reference aspect ratio information and the attitude information transmitted from each terminal 202.

6 is a flowchart illustrating a video call method according to a first embodiment of the present invention.

Referring to FIG. 6, while each terminal 202 performs a video call request to the video call control server 204, it transmits its posture information to the video call control server 204 (S602). At this time, each terminal 202 may transmit its reference aspect ratio information with posture information. However, the reference aspect ratio information is not necessarily transmitted together with the posture information, and the reference aspect ratio information may be transmitted separately from the posture information.

Next, each terminal 202 transmits the image of the user to the video call control server 204 (S604). In this case, the image transmitted to the video call control server 204 may be rotated at a predetermined angle from the reference posture according to the posture of each terminal 202 at the time of shooting.

Next, the video call control server 204 uses the attitude information received from each terminal 202 to check whether there is an image that needs to be rotated to a reference position among the images received from each terminal 202 ( S606).

As a result of checking in step S 105, when there is an image requiring rotation to the reference position, the video call control server 204 rotates the image to the reference position (S608). When the images required to rotate to the reference posture are rotated to the reference posture, the images received from each terminal 202 take the reference posture.

Next, the video call control server 204 synthesizes the images taking the reference posture to form a synthesized image, and then transmits the synthesized image to each terminal 202 (S610). Here, when the reference aspect ratio information is transmitted from each terminal 202, the video call control server 102 forms a composite image with the aspect ratio corresponding to the reference aspect ratio information and attitude information, and then the corresponding terminal 202 Send each to.

On the other hand, each terminal 202 transmits its posture information to the video call control server 204 after the posture is changed, the posture information corresponding to the changed posture can be sent back to the video call control server 204 have.

7 is a view showing a video call system according to a second embodiment of the present invention.

Referring to FIG. 7, the video call system 700 according to the second embodiment of the present invention includes a plurality of terminals 702 and a video call control server 704. Although four terminals 702 are illustrated here, the present invention is not limited thereto, and two or more terminals may be used for the terminal 702.

Each terminal 702 sends a video call control server 704 to the video call control server 704 while performing a video call request to the video call control server 704. At this time, each terminal 702 checks its own posture information, and then rotates the captured image according to the corresponding posture information and transmits it to the video call control server 704. Here, the posture information refers to information indicating how much the current posture of the terminal 702 is rotated from the preset reference posture.

8 is a view illustrating a state in which a terminal is rotated by 90 degrees clockwise from a reference posture and a state in which a terminal is rotated in a reference posture according to a second embodiment of the present invention.

Referring to FIG. 8, each terminal 702 is rotated by a reference posture (a in FIG. 8) at a 90 degree angle clockwise from the reference posture (at an angle of 270 degrees counterclockwise from the reference posture). Rotated state) (b of FIG. 8), rotated 180 degrees clockwise from the reference pose (rotated 180 degrees counterclockwise from the reference pose) (FIG. 8c), from the reference pose It may be in a state rotated 270 degrees clockwise (a state rotated 90 degrees counterclockwise from the reference posture) (d of FIG. 8).

That is, the terminal 702 is rotated in 90 degree units (ie, 0 degrees, 90 degrees, 180 degrees, and 270 degrees) from the reference posture, depending on how much the user rotates the terminal 702. You lose. In addition, as described in the first embodiment of the present invention, since it is impossible to rotate the terminal at the correct angle due to the characteristics of the terminal 702 that the user directly holds and uses, the terminal 702 may be configured to adjust the rotation angle of the terminal. You can set the threshold in advance and change the rotation state accordingly.

As shown in FIG. 8A, when the terminal 702 is in the reference posture, the terminal 702 transmits the captured image to the video call control server 704 directly. Here, the image transmitted to the video call control server 704 is transmitted in the horizontal screen mode. In an embodiment of the present invention, in the embodiments of the present invention, the horizontal screen mode refers to a case in which the horizontal screen length (or resolution) of the corresponding image is longer than the vertical screen length, and the vertical screen mode refers to the vertical screen length (or Resolution) is longer than the horizontal screen length. For example, in landscape mode, the aspect ratio of the image is 4: 3 or 16: 9, and in portrait mode the aspect ratio of the image is 3: 4 or 9:16. Can be.

As shown in (b) of FIG. 8, when the terminal 702 is rotated 90 degrees clockwise from the reference posture, the image captured by the terminal 702 is 90 degrees counterclockwise. Rotate to display. At this time, the terminal 702 rotates the captured image 90 degrees clockwise so that the video call user is displayed in the reference direction within the captured image, and transmits it to the video call control server 704. The reference direction refers to a direction in which the video call user is displayed in a normal posture (for example, a posture of the video call user heading upward in the captured video). Here, the image transmitted to the video call control server 704 is transmitted in the vertical screen mode.

As shown in (c) of FIG. 8, when the terminal 702 is rotated 180 degrees clockwise from the reference posture, the image captured by the terminal 702 is 180 degrees counterclockwise. Rotate to display. In this case, the terminal 702 rotates the captured image by 180 degrees clockwise so that the video call user is displayed in the reference direction within the captured image, and transmits it to the video call control server 704. Here, the image transmitted to the video call control server 704 is transmitted in the horizontal screen mode.

As shown in (d) of FIG. 8, when the terminal 702 is rotated 270 degrees clockwise from the reference posture, the image captured by the terminal 702 is 270 degrees counterclockwise. Rotate to display. In this case, the terminal 702 rotates the captured image 270 degrees clockwise so that the video call user is displayed in the reference direction within the captured image, and transmits it to the video call control server 704. Here, the image transmitted to the video call control server 704 is transmitted in the vertical screen mode.

As described above, each terminal 702 checks how much its current posture is rotated from the reference posture (that is, after confirming the posture information), and then rotates the captured video according to the confirmed posture information to make a video call. Send to control server 704. Here, when each terminal 702 rotates the captured image such that the video call user is displayed in the reference direction in the captured image, even if the terminal 702 is rotated from the reference position, the video call user in the rotated image The reference direction is displayed as it is.

In this case, when the posture of the terminal 702 is changed after transmitting the captured image, the terminal 702 may rotate the captured image corresponding to the changed posture in the same manner as described above, and then transmit the captured image to the video call control server 704. . Then, the video call control server 704 may analyze the photographed image rotated in response to the changed posture and form a composite image corresponding to the current screen mode of the terminal 702.

In this case, since the terminal 702 screen is placed horizontally, the image is transmitted in the horizontal screen mode in FIGS. 8A and 8C, and FIGS. 8B and 8D are in the horizontal screen mode. Although the image is transmitted in the vertical screen mode, the present invention is not limited thereto.

Next, the video call control server 704 synthesizes each image transmitted from each terminal 702 to form one synthesized image. In this case, the video call control server 704 may form a composite image according to the current screen mode (ie, horizontal screen mode or vertical screen mode) of the terminal 702.

Specifically, the video call control server 704 checks the current screen mode (ie, the horizontal screen mode or the vertical screen mode) of the corresponding terminal 702 through each image transmitted from each terminal 702, and then checks the corresponding terminal ( A composite image is formed according to the current screen mode of 702 and transmitted to the corresponding terminal 702. In this case, the video call control server 704 may transmit the synthesized image according to the aspect ratio (ie, the aspect ratio) of the terminal 702. That is, the video call control server 704 may form a composite image according to the current screen mode and the aspect ratio of the terminal 702 and transmit the synthesized image to the terminal 702.

For example, when the current screen mode of the predetermined terminal 702 is the landscape screen mode and the aspect ratio of the screen is 4: 3, the video call control server 704 synthesizes the synthesized video in the landscape screen mode. A 4: 3 aspect ratio of an image may be transmitted to the corresponding terminal 702. When the current screen mode of the predetermined terminal 702 is the vertical screen mode and the aspect ratio of the screen is 16: 9, the video call control server 704 forms the composite video in the vertical screen mode, The aspect ratio of the aspect ratio to 16: 9 may be transmitted to the corresponding terminal 702.

In this case, the video call control server 704 forms a corresponding number of synthesized images according to the type of the aspect ratio of each terminal 702, and then synthesizes according to the current screen mode and the aspect ratio of each terminal 702. The image may be transmitted to the terminal 702. For example, if the aspect ratio of each terminal 702 is two types of 4: 3 and 16: 9, the video call control server 704 is a composite video, the aspect ratio 4: 3, 3: 4 Phosphorus composite image, 16: 9 composite image, and 9:16 composite image, respectively, and then transmit the corresponding composite image to each terminal 702 according to the current screen mode and aspect ratio of each terminal 702. have.

The video call control server 704 may check the current screen mode of each terminal 702 by analyzing the image whenever (or periodically) the image is transmitted from each terminal 702. In this case, when the current screen mode of the predetermined terminal 702 is changed, the video call control server 704 may form a composite image according to the changed screen mode and transmit it to the corresponding terminal 702. For example, when the user rotates the terminal 702 from the horizontal direction to the vertical direction, the terminal 702 rotates the image in accordance with the rotated direction to transmit to the video call control server 704, the video call control server In operation 704, when the screen mode of the image of the received image is changed from the horizontal direction to the vertical direction, the synthesized image may be generated according to the changed screen mode.

According to an embodiment of the present invention, each terminal 702 rotates the captured image according to its posture information and transmits it to the video call control server 704, and the video call control server 704 of each terminal 702 By forming a composite image according to the current screen mode and transmitting it to the corresponding terminal 702, the video call users from the video call control server 704 even if each terminal 702 captures a user in a different posture and performs a video call. The composite image displayed in the reference direction in the image can be received. In this case, the users of each terminal 702 can perform a video call without the discomfort and inconvenience caused by the image of the other users in the rotated state.

9 is a diagram illustrating a state in which a video call control server according to a second embodiment of the present invention forms a composite video from images transmitted from each terminal.

Referring to FIG. 9, the first terminal 702-1 directly transmits an image captured in the reference posture to the video call control server 704, and the second terminal 702-2 rotates 90 degrees clockwise from the reference posture. The image taken while being rotated at an angle is rotated 90 degrees clockwise and then transmitted to the video call control server 704, and the third terminal 702-3 is rotated 180 degrees clockwise from the reference posture. Rotated by 180 degrees clockwise in the clockwise direction and then transmitted to the video call control server 704, the fourth terminal 702-4 is rotated by 270 degrees clockwise in the state A case in which the photographed image is rotated 270 degrees clockwise and then transmitted to the video call control server 704 will be described.

Here, the state in which the screen of the terminal 702 is placed horizontally is taken as the reference attitude. In this case, the images A and C transmitted from the first terminal 702-1 and the third terminal 702-3 are transmitted in the horizontal screen mode, and the second terminal 702-2 and the fourth terminal. Images B and D respectively transmitted from 702-4 are transmitted in the portrait screen mode. The aspect ratio of each terminal 702 is set to 16: 9.

Then, the video call control server 704 transmits the first terminal 702-1 and the third through the images A and C transmitted from the first terminal 702-1 and the third terminal 702-3, respectively. The current screen mode and aspect ratio of the terminal 702-3 may be checked. In addition, the video call control server 704 transmits the second terminal 702-2 and the fourth through the images B and D transmitted from the second terminal 702-2 and the fourth terminal 702-4, respectively. The current screen mode and aspect ratio of the terminal 702-4 may be checked.

In this case, the video call control server 704 forms the image A, B, C, D in the horizontal screen mode, forms the composite image I 'such that the aspect ratio is 16: 9, and then synthesizes the image I'. The image I 'is transmitted to the first terminal 702-1 and the third terminal 702-3. Then, the video call control server 704 forms the composite image I '' such that the aspect ratio is 16: 9 while forming the images A, B, C, and D in the vertical screen mode, and then synthesizes them. The image I ″ is transmitted to the second terminal 702-2 and the fourth terminal 702-4.

In addition, as described in the first embodiment of the present invention, each of the images A, B, C, and D in the synthesized image I 'and the synthesized image I''may have an aspect ratio and a screen size of the original image. At least one of the images may be differently processed and synthesized.

For example, as in the first embodiment, the aspect ratio or size is adjusted so as not to create an empty space. Some facial recognition can be used to crop the image.

10 is a diagram showing the configuration of a terminal according to a second embodiment of the present invention.

Referring to FIG. 10, the terminal 702 according to the second embodiment of the present invention includes a photographing unit 1000, a posture information detecting unit 1002, an image rotating unit 1004, and a video calling unit 1006. .

The photographing unit 1000 photographs the front through the camera. For example, during a video call, the photographing unit 1000 may capture a video call user.

The posture information detecting unit 1002 detects posture information of the terminal 702. That is, the posture information detecting unit 1002 detects how much the terminal 702 is rotated from the preset reference posture. The posture information detecting unit 1002 may include, for example, a gyro sensor or a gravity sensor.

The image rotating unit 1004 rotates the image captured by the photographing unit 1000 according to the attitude information of the terminal 702. For example, when the terminal 702 is rotated from the reference posture by checking the posture information detected by the posture information detecting unit 1000, the video caller 1000 moves to the reference direction within the video. The photographing unit 1000 rotates the photographed image to be displayed. In this case, even if the terminal 702 is rotated from the reference posture, the video call user is displayed in the state of maintaining the reference direction in the rotated image.

The image rotating unit 1004 transmits the rotated image or the image captured by the photographing unit 1000 to the video call unit 1006. That is, when the terminal 702 maintains the reference posture, the image rotating unit 1004 transfers the image captured by the capturing unit 1000 to the video calling unit 1006 as it is.

The video call unit 1006 performs a video call request to the video call control server 704. The video call unit 1006 transmits the image captured by the photographing unit 1000 or the image rotated by the image rotating unit 1004 to the video call control server 704. The video call unit 1006 receives a composite video from the video call control server 704.

11 is a diagram showing the configuration of a video call control server according to a second embodiment of the present invention. Referring to FIG. 11, the video call control server 704 includes a communication unit 1100, a storage unit 1102, an image analyzer 1104, and a composite image forming unit 1106.

The communication unit 1100 communicates with each terminal 702 for a video call. For example, the communication unit 1100 receives a captured image from each terminal 702. In this case, the captured image may be an image rotated by the image rotating unit 115. In addition, the communication unit 1100 transmits the composite image formed by the composite image forming unit 1106 to each terminal 702.

The storage unit 1102 stores the captured images of each terminal 702 received by the communication unit 1100. The storage unit 1102 may store the composite image formed by the composite image forming unit 1106. In this case, the storage 1102 may be a buffer for temporarily storing the captured image and the composite image of each terminal 702.

The image analyzer 1104 analyzes captured images of each terminal 702 received by the communication unit 1100 and detects a current screen mode and an aspect ratio of each terminal 702. That is, the image analyzer 1104 detects the current screen mode and the aspect ratio of the corresponding terminal 702 by analyzing the horizontal screen length (or resolution) and the vertical screen length (or resolution) of the captured image of each terminal 702. do.

The composite image forming unit 1106 synthesizes the captured images received from each terminal 702 to form a composite image. The composite image forming unit 1106 may form a composite image according to the current screen mode (horizontal screen mode or vertical screen mode) of each terminal 702. In this case, the composite image forming unit 1106 may form the composite image at the aspect ratio of each terminal 702.

12 is a flowchart illustrating a video call method according to a second embodiment of the present invention. Referring to FIG. 12, each terminal 702 checks its posture information while performing a video call request to the video call control server 704 (S1202). In this case, each terminal 702 may check its posture information through a gyro sensor or a gravity sensor installed therein.

Next, each terminal 702 rotates the captured image according to its posture information and transmits it to the video call control server 704 (S1204). In this case, each terminal 702 may rotate the captured image so that the video call user is displayed in a preset reference direction within the image.

Next, the video call control server 704 checks the current screen mode and the aspect ratio of each terminal 702 through the image transmitted from each terminal 702 (S1206).

Next, the video call control server 704 forms a composite image according to the current screen mode and aspect ratio of each terminal 702 by using the image transmitted from each terminal 702, and then displays the composite image in the corresponding terminal ( 702) (S1208).

On the other hand, each terminal 702, if its posture is changed during the video call, and rotates the captured image corresponding to the changed posture, it may transmit to the video call control server 704. Then, the video call control server 704 may analyze the photographed image rotated in response to the changed posture, form a composite image corresponding to the current screen mode of the terminal 702, and transmit the synthesized image to the terminal 702. .

On the other hand, an embodiment of the present invention may include a computer-readable recording medium including a program for performing the methods described herein on a computer. The computer-readable recording medium may include a program command, a local data file, a local data structure, or the like, alone or in combination. The media may be those specially designed and constructed for the present invention or may be known and available to those of ordinary skill in the computer software arts. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floppy disks, and magnetic media such as ROMs, And hardware devices specifically configured to store and execute program instructions. Examples of program instructions may include machine language code such as those generated by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. I will understand.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

200, 700: video calling system
202 and 702: terminal
204, 704: Video call control server
500: communication unit
502: storage unit
504: image rotating unit
506: composite image forming unit
1000: filming unit
1002: posture information detection unit
1004: video rotating part
1006: video call
1100: communication unit
1102: storage unit
1104: image analysis unit
1106: composite image forming unit

Claims (22)

A terminal for transmitting an image of a video call user; And
Including a video call control server for forming a composite video synthesized with the images transmitted by one or more terminals, and transmitting the synthesized video to the terminal,
Each of the images is rotated according to the attitude information detected by the terminal and synthesized into the synthesized image.
The method according to claim 1,
The terminal transmits the posture information to the video call control server.
The video call control server is configured to rotate the video received from the terminal to a reference posture according to the received posture information, and synthesize the rotated video to form the synthesized video.
The method according to claim 2,
The terminal transmits aspect ratio information of the terminal together with the posture information to the video call control server.
The method according to claim 2,
The terminal, when the posture of the terminal is changed after transmitting the posture information, transmits posture information corresponding to the changed posture to the video call control server.
The method according to claim 1,
The terminal detects posture information, and transmits the image captured according to the detected posture information to a reference posture to be transmitted to the video call control server.
The method according to claim 5,
When the posture of the terminal is changed after the posture information is transmitted, the terminal rotates the captured image according to the posture information corresponding to the changed posture and transmits the captured image to the video call control server.
The method according to claim 5,
The video call control server checks a screen mode of the terminal through an image transmitted by the terminal, and forms the composite image according to the screen mode and transmits the synthesized image to the terminal.
The method of claim 7,
The video call control server checks the aspect ratio of the terminal together with the screen mode from the image received from the terminal, forms the composite image according to the screen mode and the aspect ratio, and transmits the image to the terminal. Currency system.
Transmitting, at the terminal, an image of the video call user;
Forming a synthesized video obtained by synthesizing images transmitted from one or more terminals in a video call control server; And
In the video call control server, comprising the step of transmitting the composite video to the terminal,
Each video constituting the composite video is rotated and synthesized according to posture information detected by the terminal.
The method according to claim 9,
The transmitting of the video may further include transmitting posture information of the terminal to the video call control server.
The forming of the synthesized image may include: rotating the image received from the terminal to a reference position according to the received posture information, and synthesizing the rotated image to form the synthesized image.
The method of claim 10,
The transmitting of the video may further include transmitting aspect ratio information of the terminal together with the posture information to the video call control server.
The method of claim 10,
The terminal, if the posture of the terminal is changed after transmitting the posture information, and transmits the posture information corresponding to the changed posture to the video call control server.
The method according to claim 9,
The step of transmitting the image,
Detecting posture information of the terminal; And
And rotating the captured image according to the detected posture information to a reference posture and transmitting the image to the video call control server.
The method according to claim 13,
If the posture of the terminal is changed after the posture information is transmitted, the terminal rotates the captured image according to the posture information corresponding to the changed posture, and transmits the captured video to the video call control server.
The method according to claim 13,
Forming the composite image,
Confirming a screen mode of the terminal through an image transmitted by the terminal; And
And forming the composite image according to the screen mode.
16. The method of claim 15,
Forming the composite image,
Checking the aspect ratio of the terminal together with the screen mode from the image received from the terminal; And
And forming the composite video according to the screen mode and the screen ratio.
A communication unit configured to receive posture information of each terminal and an image of a corresponding user from at least one terminal;
An image rotating unit configured to rotate an image requiring rotation to a reference posture according to the posture information among the images received by the communication unit to the reference posture; And
Synthesized image forming a composite image by synthesizing the image of the image received by the communication unit does not need to rotate to the reference position and the image rotated in the reference position by the image rotation unit of the image received by the communication unit Includes wealth,
The communication unit, the video call control server for transmitting the composite video to each terminal.
18. The method of claim 17,
And the communication unit receives reference aspect ratio information of each terminal from each terminal.
19. The method of claim 18,
The composite image forming unit forms the composite image according to the reference aspect ratio information and the posture information.
A communication unit which receives an image of a video call user from at least one terminal;
An image analyzer detecting a screen mode of each terminal from the received image; And
And a synthesized image forming unit configured to synthesize the received images according to the detected screen mode of each terminal to form a synthesized image.
The communication unit, the video call control server for transmitting the composite video to the terminal.
The method of claim 20,
The image analyzer detects the aspect ratio of each terminal from the received image,
The synthesized image forming unit may form a synthesized image by synthesizing the received image according to the screen mode and the screen ratio of each terminal.
In the terminal used in the video call system,
A photographing unit for photographing a video call user;
A posture information detector configured to detect a rotated state from a preset reference posture of the terminal;
An image rotating unit rotating the image photographed by the photographing unit according to the rotated state; And
And a video call unit configured to transmit an image captured by the photographing unit or an image rotated by the image rotating unit.

Images