KR100973131B1 - Method For Transmitting Video Using Video CODEC Profile Exchange - Google Patents

Abstract

The present invention relates to a video transmission method by exchanging video codec profile, and that the characteristics of heterogeneous video codec by dynamically exchanging profile of video codec necessary for encoding video signal between calling party and called party during video communication between called party An object of the present invention is to provide an image transmission method by exchanging image codec profiles in order to eliminate a difference and to perform optimized image communication.

To this end, the present invention provides a video transmission method in a video communication terminal, comprising: a session setting step of establishing a session for video communication between one video communication terminal and another video communication terminal; A profile requesting step of transmitting, by the one video communication terminal, an image codec profile request to the other video communication terminal; A profile receiving step of receiving, by the one video communication terminal, an image codec profile response including image codec profile information from the other video communication terminal; A video codec profile setting step of determining, by the one video communication terminal, a codec characteristic of the other video communication terminal according to a video codec profile response received from the other video communication terminal and setting the video codec profile; And transmitting, by the one video communication terminal, the video according to the set video codec profile and transmitting the video to the other video communication terminal. The video telephony service, the video on demand (VOD) service, the multimedia messaging service (MMS) And the like.

Video codec profile exchange, video codec interworking, video telephony service, video on demand (VOD) service, multimedia messaging service (MMS)

Description

Method for Transmitting Video Using Video CODEC Profile Exchange             

1 is a configuration diagram of an embodiment of a video telephone service system to which the present invention is applied.

2 is an explanatory diagram showing an image transmission method by exchanging image codec profiles according to an embodiment of the present invention;

3 is a block diagram of an embodiment of a multimedia messaging service system to which the present invention is applied.

4 is an explanatory diagram showing a video transmission method by video codec profile exchange according to another embodiment of the present invention;

5 is a flowchart illustrating an image transmission method by exchanging image codec profiles according to an embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an object required for a Simple Object Access Protocol (SOAP) agent to associate a component with a SOAP object according to a SOAP response according to an embodiment of the present invention. FIG.

* Explanation of symbols on the main parts of the drawing                 

11,31: IP network 12: terminal A

121,131,331,341: Codec 122,132,342: SOAP Agent

13: terminal B 32: MMS server

33: transmitting terminal 34: receiving terminal

The present invention relates to a video transmission method by exchanging video codec profiles, and more particularly, the calling party and the called party in the video communication between the calling party in the video telephony service, video on demand (VOD) service, multimedia messaging service (MMS), etc. The present invention relates to a video transmission method by exchanging video codec profiles by dynamically exchanging profiles of video codecs necessary for encoding video signals, thereby eliminating characteristic differences of heterogeneous video codecs, and enabling optimized video communication.

In the present invention, the image should be interpreted as a concept including a moving image as well as a still image.

Recently, interest and discussion on 'ubiquitous' that can receive communication services regardless of time, place, or terminal (3A: anytime, anywhere, any device) are actively progressing. Such ubiquitous is set as the ultimate goal of telecom operators, and specific contents and forms are already appearing as a converged service of wired and wireless communication.

Wired / wireless integration services are sufficient to attract service providers because they can offer wireline and wireless subscribers a new level of communication services combining wired broadband and wireless mobility. Due to the development of wired and wireless networks and the rapid development of user terminals, it is possible to provide a level of service that satisfies users' desire to transmit and receive a large amount of multimedia information. In particular, communication services using video among various user terminals are activated. It is expected to be.

Video communication service depends on network bandwidth and terminal performance. Especially, video compression codec is one of important factors in communication function. In order to efficiently transmit a video signal in such a video communication service, compression of the video signal is essential, and an image codec is provided to provide such a function. Currently, various codecs exist around the world, and many research institutes and companies are working to preempt and standardize these codec technologies.

However, even in the case of providing the wired / wireless video communication service, even when the user terminals at both ends of the communication employ the same codec technology, there are differences in performance, resolution, and network connection technology of the two terminals, and there are various profiles for the same codec. Currently, the mobile communication service maintains a video codec profile by storing all the information about the terminal of the customer in the database, so that video on demand (VOD) service and multimedia to the mobile terminal of the customer It provides a video service such as a messaging service (MMS: Multimedia Messaging Service).

However, this approach is a burden to maintain and repair the terminal information database that stores the information of all wired and wireless terminals to the service provider to provide wired and wireless communication services. In addition, in such a terminal information database-based service, a technical burden is required to provide a large-scale video communication service for transmitting and receiving images to and from the opposite terminal in real time.

Therefore, in the video communication, if the transmitting terminal performs the encoding process in consideration of the processing capability of the receiving terminal, the problem in the video communication service using the terminal information database mentioned above may be solved.

However, as the current technology that can provide video communication function, the International Telecommunication Union (ITU) International Standard H.323 and the Internet Engineering Task Force (IETF) Standard Session Initiation Protocol (SIP) are presented as alternatives. It is becoming.

H.323 is a standard that defines a multimedia communication procedure over a low speed network. There are no codec constraints. Since H.323 defines a low speed network as a target system, it is difficult to apply it to a high speed IP (Internet Protocol) network. Follow.

In addition, although the session establishment protocol (SIP) defines a procedure for establishing a session for multimedia information exchange in an IP network, it does not define a function and performance of a terminal that will transmit and receive video information to be exchanged.

As described above, since the conventional technology does not consider the capability of the codec and the quality of service corresponding thereto, in order to actually establish a video communication service, a service provider who wants to provide a video service must manage information of all wired and wireless terminals as described above. There was a problem.

The present invention has been proposed to solve the above problems, and the characteristics of the heterogeneous video codec by dynamically exchanging the profile of the video codec required for encoding the video signal between the calling party and the called party during the video communication between the calling party An object of the present invention is to provide an image transmission method by exchanging image codec profiles in order to eliminate the difference and to enable optimized image communication.

According to an aspect of the present invention, there is provided a video transmission method of a video communication terminal, comprising: setting up a session for video communication between one video communication terminal and another video communication terminal; A profile requesting step of transmitting, by the one video communication terminal, an image codec profile request to the other video communication terminal; A profile receiving step of receiving, by the one video communication terminal, an image codec profile response including image codec profile information from the other video communication terminal; A video codec profile setting step of determining, by the one video communication terminal, a codec characteristic of the other video communication terminal according to a video codec profile response received from the other video communication terminal and setting the video codec profile; And transmitting, by the one video communication terminal, the video according to the set video codec profile and transmitting the video to the other video communication terminal.

Meanwhile, another method of the present invention provides a video transmission method in a video service system, comprising: a session setting step of setting, by the video service system, a session for video transmission according to a video transmission request from a video communication terminal; A profile requesting step of transmitting, by the video service system, an image codec profile request to the video communication terminal; A profile receiving step of receiving, by the video service system, an image codec profile response including image codec profile information from the video communication terminal; And transmitting, by the video service system, an image in a video signal format supported by a codec (decoder) of the video communication terminal according to the video codec profile response received from the video communication terminal.

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The above-mentioned objects, features and advantages will become more apparent from the following detailed description in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of an embodiment of a video telephone service system to which the present invention is applied.

As shown in FIG. 1, in a video telephone service system to which the present invention is applied, a video call is made between terminals 12 and 13 based on an Internet Protocol (IP) network 11. The terminal A 12 and the terminal B 13 request and respond to the video codec profiles 123 and 133 of the other party using the Simple Object Access Protocol (SOAP) agents 122 and 132, and the user connects to the video codec profiles 123 and 133. Information about network bandwidth and video codec is included. In this case, since the SOAP agents 122 and 132 perform functions similar to those of a small web server, they operate independently of the video call service.

The terminal A 12 and the terminal B 13 refer to a multimedia terminal of the same type or heterogeneity capable of video on demand (VOD) service, multimedia messaging service (MMS), and the like. When the connection is made between the terminal A 12 and the terminal B 13, the terminal A 12 and the terminal B 13 each have a SOAP agent including the image codec profiles 123 and 133 set as their bandwidth and the characteristics of the video codec. Drive (122,132). As described above, the SOAP agent 122 and 132 functions similar to a small web server to provide video codec profile information to the other terminal 13 and 12 independently of the service to be provided by the terminal 12 and 13. .                     

That is, the terminal A 12 requests the video codec profile information of the terminal B 13 to the SOAP agent 132 of the terminal B 13, and the SOAP agent 132 of the terminal B 13 transmits the terminal A 12. The corresponding video codec profile 133 is transmitted. Meanwhile, the terminal B 13 also requests the video codec profile information of the terminal A 12 from the SAOP agent 122 of the terminal A 12, and the SAOP agent 122 of the terminal A 12 sends the terminal B 13. ) Transmits the corresponding video codec profile 123.

2 is an explanatory diagram showing an image transmission method by exchanging image codec profiles according to an embodiment of the present invention.

First, when the video call is connected between the terminal A 12 and the terminal B 13 by session establishment protocol (SIP) or session establishment using the H.323 protocol (201), the terminal A 12 and the terminal B 13 ) Transmits the video codec profile request to the counterpart, respectively (202 and 203).

Then, the terminal A 12 and the terminal B 13 transmit the video codec profile response including their own video codec profile information to the counterpart 13 and 12 according to the video codec profile request. Transmit (204, 205).

By this process, the terminal A 12 and the terminal B 13 can optimize the encoding scheme according to the video codec profile of the counterpart. That is, if the resolution of the terminal A 12 is the QCIF (Quarter Common Intermediate Format) and the resolution of the terminal B 13 is the Common Intermediate Format (CIF), the terminal A 12 transmits the image to the terminal B 13. Is encoded in the CIF (Common Intermediate Format), and the terminal B 13 encodes the image transmitted to the terminal A 12 in the QCIF (Quarter Common Intermediate Format).                     

Even if the function of exchanging the image codec profile is not implemented in the terminal A 12 or the terminal B 13, the image codec profile request enters the time-out state, and thus the basic connection is established through the session already established. There is no problem in maintaining the state of communication. A more detailed description thereof will be described later with reference to FIG. 5.

3 is a block diagram of an embodiment of a multimedia messaging service system to which the present invention is applied.

As shown in FIG. 3, the multimedia message service system to which the present invention is applied includes a transmitting terminal 33, a receiving terminal 34, and an MMS server 32 connected to each other based on an IP network 31. do. In this case, the MMS server 32 performs a function of providing various multimedia messaging services such as an image and a video, while the existing short message service (SMS) can transmit only text.

First, when the transmitting terminal 33 selects a specific video codec profile to encode a video file and then transmits the video file to the MMS server 32, the MMS server 32 temporarily stores the received video file in the message storage 35. . In addition, a simple object access protocol (SOAP) document is generated by combining the image codec profile corresponding to the image file and the storage location information of the image file, and then stored in a mailbox (the corresponding area of the message store 35) of the receiving terminal 34. do.

Meanwhile, when a new SOAP document is input to a mailbox, the MMS server 32 checks whether each receiving terminal 34 is able to receive a message according to a priority set by a user in advance. As a result of the check, if the reception terminal 34 is able to receive the message, a message indicating the arrival of the message is transmitted to the reception terminal 34, and if the reception terminal 34 cannot receive the current message, the message arrives until it becomes possible. Delay the transmission of a message that informs you.

On the other hand, when the receiving terminal 34 requests the message reception to the MMS server 32, the image codec profile exchange between the MMS server 32 and the receiving terminal 34 according to the procedure as shown in Figure 4 below This will happen. After the video converter 321 of the MMS server 32 performs the video conversion according to the video codec profile obtained by the above process, the service is provided to the receiving terminal 34.

4 is an explanatory diagram illustrating an image transmission method by exchanging image codec profiles according to another embodiment of the present invention.

First, when an MMS session is established between the MMS server 32 and the receiving terminal 34 (401), the MMS server 32 receives an image codec profile request using the Simple Object Access Protocol (SOAP). 34, and the SOAP agent 342 of the receiving terminal 34 transmits the video codec profile response including the video codec profile information to the MMS server 32 (step 34). 403).

Then, the image converter 321 of the MMS server 32 converts the image into a video signal format supported by the codec 341 of the receiving terminal 34 according to the image codec profile response. 34 to a codec (decoder) 341.

5 is a flowchart illustrating an image transmission method by exchanging image codec profiles according to an embodiment of the present invention.                     

First, when a video codec profile is implemented using a SOAP in a calling terminal and a called terminal, the elements constituting the video codec profile are mapped to entities of SOAP, and the access is allowed by SOAP. In this case, SOAP (Simple Object Access Protocol) is a protocol for accessing an object scattered on a network, and a calling terminal and a called terminal must include a SOAP agent to make a SOAP request and to perform a SOAP response. . In general, the SOAP agent can be implemented in the same way as a normal web server, and it is more easy to implement since it is based on XML (eXtensible Markup Language), and it is possible to service a large number of objects with one agent and to code size. Since it is small, it is easy to implement in the terminal.

First, after establishing a session between the calling terminal and the called terminal (501), the SOAP request (Profile Request) and the corresponding SOAP response (Profile Response) is exchanged with each other (502 to 504). In this case, when the SOAP response is not received because the encoder of the terminating terminal does not support the SOAP request, a simple timeout check is performed based on the session information obtained in the session establishment process 501. An image codec profile is set (506). That is, the calling terminal sets the image codec profile considering only network access information by using the access information between the calling terminal and the called terminal obtained through the session establishment process 501.

On the other hand, when the originating terminal receives a SOAP response (Profile Response) from the destination terminal, the component corresponding to the SOAP entity is stored in the memory according to the SOAP response (505).                     

The originating terminal and the terminating terminal analyze the SOAP entity stored in the memory and extract information for video signal encoding optimization. That is, each of the calling terminal and the called terminal checks whether the encoder supports the video signal format (Visual_Coding_Format) supported by the decoder of the other terminal (507), and then the video supported by the encoder of the other terminal is supported by the decoder of the other terminal. If the signal format (Visual_Coding_Format) is supported, an image codec profile optimized for aspect ratio, color depth, etc. according to the video signal format (Visual_Coding_Format) of the opposite terminal is set (509).

If the encoder does not support the video signal format (Visual_Coding_Format) supported by the decoder of the opposite terminal, the video codec profile is set to a preset default value (508).

Thereafter, the video is encoded using the video codec profile generated as described above and then transmitted to the counterpart (510), so that optimized video communication is performed between the calling party and the called party. At this time, the video signal encoded according to the video codec profile set to the default value is further required to convert the video communication service provider to a form that can be decoded on the receiving side.

Meanwhile, entities required by the SOAP agent to map components to SOAP entities according to a SOAP response are shown in FIG. 6, and the following is an example of implementing an image codec profile using SOAP.

<SOAP: name = ”AV_CODEC_PROFILE” />                     

<element name = ”AV_Service_Type”>

<simpleType base = ”string”>

<enumeration value = ”Unknown” />

<enumeration value = ”VideoPhone” />

<enumeration value = ”AVMessageContent” />

<enumeration value = ”VODContent” />

</ eimpleType>

</ element>

<element name = ”Bit_Rate” type = ”int” />

<element name = ”Visual_Coding_Format”>

<simpleType base = ”string”>

<enumeration value = ”MPEG1” />

<enumeration value = ”MPEG2” />

<enumeration value = ”H.263” />

<enumeration value = ”MPEG4” />

<enumeration value = ”H.264” />

<enumeration value = ”WMV9” />

<enumeration value = ”Other” />

</ eimpleType>

</ element>                     

<element name = ”AudioCodingFormat” type = ”string” />

<simpleType base = ”string”>

<enumeration value = ”PCM” />

<enumeration value = ”ADPCM” />

<enumeration value = ”MP2” />

<enumeration value = ”MP3” />

<enumeration value = ”AC3” />

<enumeration value = ”AC97” />

<enumeration value = ”WMA” />

<enumeration value = ”Other” />

</ eimpleType>

</ element>

<element name = ”Frame_Resolution” type = ”int” />

<element name = ”Aspect_ratio”>

<simpleType base = ”string”>

<enumeration value = ”4to3” />

<enumeration value = ”16to9” />

<enumeration value = ”Cinemascope” />

<enumeration value = ”Cinerama” />

</ eimpleType>                     

</ element>

<element name = ”Frame_Height” type = ”int” />

<element name = ”Frame_Width” type = ”int” />

<element name = ”Average_Frame_Per_Second” type = ”int” />

<element name = ”Color_Type” type = ”string” />

<simpleType base = ”string”>

<enumeration value = ”YUV” />

<enumeration value = ”RGB” />

<enumeration value = ”CMY” />

<enumeration value = ”Other” />

</ eimpleType>

</ element>

<element name = ”Color_Depth” type = ”string” />

<simpleType base = ”string”>

<enumeration value = ”256” />

<enumeration value = ”24bit” />

<enumeration value = ”32bit” />

<enumeration value = ”Other” />

</ eimpleType>

</ element>                     

<element name = ”Audio_Sampling_Rate” type = ”int” />

<element name = ”Bits_Per_AudioSample” type = ”int” />

<element name = ”Audio_Channels”>

<simpleType base = ”string”>

<enumeration value = ”Mono” />

<enumeration value = ”Stereo” />

<enumeration value = ”5.1_Surround” />

<enumeration value = ”6.1_Surround” />

</ eimpleType>

</ element>

</ SOAP:>

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.). Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention as described above, by dynamically exchanging the profile of the video codec required for encoding the video signal between the calling party and the called party during video communication in video telephony service, video on demand (VOD) service, multimedia messaging service (MMS), etc. In addition, there is an effect that can realize optimized video communication by eliminating the characteristic difference of heterogeneous video codecs.

Claims (7)

In the video transmission method in the video communication terminal, A session setting step of setting a session for video communication between one video communication terminal and another video communication terminal; A profile requesting step of transmitting, by the one video communication terminal, an image codec profile request to the other video communication terminal; A profile receiving step of receiving, by the one video communication terminal, an image codec profile response including image codec profile information from the other video communication terminal; A video codec profile setting step of determining, by the one video communication terminal, a codec characteristic of the other video communication terminal according to a video codec profile response received from the other video communication terminal and setting the video codec profile; And An image transmission step of transmitting, by the one video communication terminal to the other video communication terminal by encoding an image according to the set video codec profile Image transmission method by exchanging image codec profile comprising a. The method of claim 1, The image codec profile setting step, Since the one video communication terminal does not receive a video codec profile response from the other video communication terminal within a predetermined time, setting the video codec profile in consideration of network access information based on the session information obtained in the session setting step. A video transmission method by video codec profile exchange. The method according to claim 1 or 2, The image codec profile setting step, Checking, by the one video communication terminal, whether its codec (encoder) supports a video signal format (Visual_Coding_Format) supported by the codec (decoder) of the other video communication terminal; As a result of the checking, the video codec profile corresponding to the codec (decoder) of the other video communication terminal is set as its codec (encoder) supports the format of the video signal supported by the codec (decoder) of the other video communication terminal. Doing; And As a result of the checking, setting the video codec profile to a preset default value because its encoder does not support the format of the video signal supported by the codec (decoder) of the other video communication terminal. Image transmission method by exchanging image codec profile comprising a. The method of claim 3, wherein Each of the video communication terminal, A Simple Object Access Protocol (SOAP) agent is included, and the image codec profile, the image codec profile request, and the image codec profile response are implemented using the Simple Object Access Protocol (SOAP). The video transmission method by video codec profile exchange. In the video transmission method in a video service system, A session setting step of setting, by the video service system, a session for video transmission according to a video transmission request from a video communication terminal; A profile requesting step of transmitting, by the video service system, an image codec profile request to the video communication terminal; A profile receiving step of receiving, by the video service system, an image codec profile response including image codec profile information from the video communication terminal; And An image transmission step of encoding and transmitting an image in a video signal format supported by a codec (decoder) of the video communication terminal according to a video codec profile response received from the video communication terminal; Image transmission method by exchanging image codec profile comprising a. delete delete

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