KR100867678B1 - Method and apparatus for measuring quality of real video call using tv-out function of cellular phone - Google Patents

Abstract

A method and an apparatus for measuring the quality of video call using the TV-OUT function of a mobile terminal are provided to transmit image reproduced from the mobile terminal through the TV-OUT line of the mobile terminal to the video call quality apparatus and measure the quality of video call. A video call is generated between a calling visual terminal(10) and an incoming visual display terminal(20). The calling visual terminal and the incoming visual display terminal transmits generated image to video call instrument for measuring quality through the TV-OUT line by using video call. The received video of the incoming visual display terminal is extracted from the received image of the incoming visual display terminal. The transmitted image of the calling visual display terminal and the received image of the incoming visual display terminal are synchronized.

Description

Method and apparatus for measuring video call quality using TV-OTV function of video terminal {METHOD AND APPARATUS FOR MEASURING QUALITY OF REAL VIDEO CALL USING TV-OUT FUNCTION OF CELLULAR PHONE}

The present invention relates to a method and apparatus for measuring video call quality using a TV-out function of a video terminal, and more particularly, when a video call is formed between an originating video terminal and an incoming video terminal to perform a video call. The video call quality measurement method and apparatus for transmitting the video playback from the terminal to the video call quality measurement device through the TV-OUT line of the video terminal, and the video call quality measurement device to measure the quality of the actual immersion video received by the user It is about.

With the rapid development of mobile communication technology, not only simple voice calls but also video call services are being provided, and these video call services have also been developed to meet the demands of consumers. The quality of video call in the 3rd generation mobile communication system is an important factor in determining the success or failure of the 3rd generation mobile communication service, and technologies and methods for measuring the quality of video call that can be felt by subscribers are also very important.

Referring to FIG. 1, in order to measure video call quality, a video call call is set between video terminals, and when a video call call is set, a reference image necessary for measuring video call quality is sent to the other party, as shown in FIG. 1. Similarly, call quality measurement parameters such as video MOS (Mean Opinion Score), PNSR, Blur, Blockiness, and Jerkiness should be measured through an algorithm that compares the transmitted video and the received video.

On the other hand, in order to measure the haptic video call quality that can be experienced by the actual user, first of all, the video call quality should be measured using a real commercial video terminal, not a measuring device. However, unless the video terminal is modified for the purpose of measuring the call quality, since there is no method for transmitting the reference video to the opposite video call quality meter through the actual commercial video terminal from the external measuring device, the WCDMA wireless data modem is conventional. And a method using a reference image server are mainly used, which will be described with reference to FIGS. 2 to 3.

2 is a view for explaining a method for measuring the call quality using a conventional WCDMA wireless data modem.

Referring to FIG. 2, instead of using an actual video terminal for video call quality measurement, a WCDMA wireless data modem, for example, a PCMCIA type, is embedded in a video quality measurer (or PC), and H. A video telephony emulator that implements the 324M protocol and video codec in software. Next, the video telephony emulator on the calling video quality meter connects via the WCDMA wireless data modem via the incoming video quality meter and the wireless data modem, and then on the 64 kbps bearer channel between the two video telephony emulators. After the 324M video call is connected, the reference video call emulator transmits the reference video to the calling video call quality meter, and compares the reference video received from the receiving video call quality meter with the previously compared comparison video. It is a method of measuring video call quality. However, in this case, the communication path is different from the actual video call, and unlike the real video terminal, the video telephony emulator on the measuring device is used. Therefore, the network characteristics and the codec characteristics are different. There is a problem that does not reflect the quality.

3 is a view for explaining a method of using a conventional reference image server.

Referring to FIG. 3, in order to solve the drawback that an external video call quality meter cannot transmit a reference video through an actual video terminal, a reference video server connected to an exchange instead of the called video terminal is connected to an H.324M video phone. Receiving and transmitting a reference video set to the calling video terminal. The reference video server is connected to the core network via H.324M / E1 and uses the H.324M protocol and DSP-based codec on the video IVR board to receive video call calls. However, even in this case, the video call communication path is connected to the video call path, but since one side is a server rather than a video terminal, the codec characteristics and quality are different from the actual video terminal and do not reflect the wireless environment of one side. Has a problem.

On the other hand, as disclosed in the content filed by the applicant in accordance with 10-2007-0045776 filed on May 11, 2007, the called video terminal transmits the replacement video as a reference video to the calling video terminal, the calling video terminal There has also been proposed a method of measuring the quality of a video call by transmitting the received substitute video to a video call quality measuring instrument and comparing the substitute video with a comparison video stored in advance in the video call quality measuring instrument. However, this method cannot accurately reflect the camera and video codec characteristics of the video terminal and cannot use the transmitted video of the outgoing video terminal as a reference video, and thus cannot reflect the actual video call quality. There is this.

The present invention has been made to overcome the above-described problems, when the video call call is formed between the calling video terminal and the called video terminal, the video call quality of the video played through the TV-OUT line of the video terminal An object of the present invention is to provide a method and apparatus for measuring the quality of a video call directly transmitted to a measuring device, and the video call quality measuring device measures the quality of a video call.

In addition, the present invention can accurately reflect the camera and the video codec characteristics of the video terminal by transmitting the video played back from the video terminal to the video call quality measuring device through the TV-OUT line to measure the quality of the video call. It is another object of the present invention to provide a method and apparatus for measuring video call quality.

In addition, the present invention transmits the video played back from the video terminal to the video call quality measuring apparatus through the TV outline of the calling video terminal and the called video terminal to measure the video call quality, the video terminal to measure the video call quality It is another object of the present invention to provide a video call quality measuring method and apparatus that can easily measure the quality of a video call without adding special functions.

In addition, the present invention can not only measure the video call quality by transmitting the video played back from the video terminal to the video call quality measuring device through the TV outline of the calling video terminal and the called video terminal, but also from the called video terminal It is possible to measure the video call quality by transmitting the preset video to the terminal and comparing it with the comparison video. Using the video as a reference video, the video call to the video communication network excluding the camera and video codec quality of the video terminal Another object is to provide a video call quality measuring method and apparatus capable of accurately measuring quality.

According to an aspect of the present invention to achieve the above object, in the method for measuring the video call quality between the calling video terminal and the called video terminal, a video call call is formed between the calling video terminal and the called video terminal Step, using the formed video call call to transmit the video played by the calling video terminal and the called video terminal to the video call quality measuring device through the TV-OUT line, the video call quality measuring device received Extracting the transmission video of the outgoing video terminal from the playback video of the outgoing video terminal, extracting the reception video of the incoming video terminal from the playback video of the incoming video terminal, and comparing the video extracted by the video call quality measurement apparatus; A video terminal comprising the step of measuring the video call quality A video call quality measurement method using a TV-OUT function can be provided.

Herein, the transmitting of the video played by the calling video terminal and the called video terminal to the video call quality measuring apparatus through the TV-OUT line using the formed video call call may include: It can be configured to be transmitted through the video signal converter.

The method may further include extracting a transmission video of the calling video terminal from the playback video of the calling video terminal, and extracting the reception video of the called video terminal from the playback video of the called video terminal. And extracting, in real time, a predetermined frame of the received video from the playback video of the calling video terminal and the playing video of the called video terminal.

In addition, the step of measuring the video call quality by comparing the video extracted by the video call quality measuring apparatus, the step of synchronizing the transmission video of the extracted outgoing video terminal and the incoming video of the incoming video terminal and the synchronized outgoing video terminal And measuring the quality of the video call by comparing the transmitted video with the received video of the incoming video terminal.

The synchronizing of the extracted transmission video of the originating video terminal and the reception video of the called video terminal may include: synchronizing a compressed video of the transmission video of the extracted transmission video terminal and the transmission video extracted from the transmission video terminal; Synchronizing the I-frame of the compressed video with respect to the transmitted video extracted from the originating video terminal and the I-frame of the compressed video with respect to the received video extracted from the incoming video terminal, and compressing the received video extracted from the incoming video terminal. And synchronizing the I-frame of the video with the received video of the extracted called video terminal and synchronizing the transmission video of the extracted outgoing video terminal and the received video of the extracted incoming video terminal.

In addition, the step of measuring the quality of the video call by comparing the transmission video of the synchronized outgoing video terminal and the received video of the incoming video terminal, the transmission video of the outgoing video terminal as a reference video, The transmission video transmitted by the calling video terminal may be compared with the reference video to measure the quality of the video call.

The video transmitted from the called video terminal to the calling video terminal through the video call is a substitute video preset by the called video terminal, and the playback video of the calling video terminal received by the video call quality measuring device. And extracting the substitute video, which is a received image of the calling video terminal, from the video call quality measuring device, and comparing the extracted substitute video with the comparison video stored in advance. have.

According to another aspect of the present invention, in the video call quality measuring apparatus for measuring the video call quality between the calling video terminal and the called video terminal, when the video call call is formed between the calling video terminal and the called video terminal, the formed video Means for receiving a video played by the calling video terminal and the called video terminal through a TV-OUT line by using a call call; extracting a transmitting video of the calling video terminal from the playing video of the calling video terminal; It is possible to provide a video call quality measuring apparatus including means for extracting a received video of the called video terminal from a playback video of a video terminal and means for measuring video call quality by comparing the extracted video.

According to the present invention, when a video call is formed between an outgoing video terminal and an incoming video terminal, the video played on the video terminal is transmitted to the video call quality measuring apparatus through the TV-OUT line of the video terminal, and the video call quality measuring apparatus is provided. By measuring the quality of the video call, it is possible to provide a method and apparatus for measuring the actual video call quality experienced by the user of the video terminal directly.

In addition, according to the present invention, the video terminal transmits the video played back from the video terminal to the video call quality measuring apparatus through the TV-OUT line to measure the quality of the video call, accurately reflecting the camera and video codec characteristics of the video terminal It is possible to provide a video call quality measurement method and apparatus.

In addition, according to the present invention, by transmitting the video played back from the video terminal to the video call quality measuring device through the TV outline of the outgoing video terminal and the incoming video terminal to measure the video call quality, a special function is added to the video terminal There is no need to do this, and a method and apparatus for measuring video call quality which can more easily measure the quality of a video call can be provided.

In addition, according to the present invention, through the TV outline of the outgoing video terminal and the incoming video terminal can transmit the video played back from the video terminal to the video call quality measuring device to measure the video call quality, It is possible to measure the video call quality by transmitting a preset alternative video to the calling video terminal and comparing it with the comparison video, and using the alternative video as a reference video for the video communication network excluding the camera and video codec quality of the video terminal. A video call quality measuring method and apparatus capable of accurately measuring video call quality can be provided.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a diagram illustrating a configuration for measuring video call quality according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the calling video terminal 10 and the called video terminal 20 perform a video call through a mobile communication network. Here, the outgoing video terminal 10 and the incoming video terminal 20 refer to a general commercial video terminal having a function of performing a video call. Meanwhile, the mobile communication network refers to a mobile communication environment such as a WCDMA system supporting video call, and includes a mobile switching center (MSC), a home location register (HLR) and a visitor location register (Visitor Location Register). VLR) means a backbone network that controls subscriber's location registration, call connection control, and billing processing. The mobile communication network refers to the entire network supporting video telephony as a component other than the video terminal, and the present invention can be applied as long as it is all kinds of networks supporting video telephony. The detailed description is omitted since it is not directly related to the configuration.

When the calling video terminal 10 and the called video terminal 20 make a video call by forming a video call, the calling video terminal 10 and the called video terminal 20 respectively display both the sent video and the received video. Playback on the display unit of the terminal. Referring to the display unit of the calling video terminal 10 in FIG. 4, an image of the calling video terminal user transmitted by the calling video terminal is displayed on the top of the display unit, and an image of the user of the called video terminal received by the calling video terminal is displayed on the display unit. Is played at the bottom. On the other hand, the incoming video terminal 20 is displayed on the contrary.

The video played back by the calling video terminal 10 and the called video terminal 20 by performing the video call on the display unit of the video terminal is transmitted to the video call quality measuring apparatus 30 through the TV-OUT line of the video terminal. In this case, the reproduced image transmitted from the video terminal is a TV video signal, which is transmitted to the TV / USB video signal converter 40 connected through the TV-OUT line of the video terminal. The TV / USB video signal converter 40 converts the received TV video signal into a USB video signal and directly connects to the USB port of the video call quality measuring device 30 to transmit the video signal received from the video terminal. do.

The video call quality measuring apparatus 30 is connected to the calling video terminal 10 and the called video terminal 20, respectively, and receives and plays the video played by the calling video terminal 10 and the called video terminal 20. From the playback video of the video terminal 10, a predetermined frame of the received video is extracted in real time from the playback video and the playback video of the incoming video terminal 20, and the transmitted video and the incoming video terminal transmitted by the extracted calling video terminal 10 ( 20) synchronizes the received video, and compares the transmitted video transmitted by the synchronized outgoing video terminal 10 with the received video received by the incoming video terminal 20, thereby measuring the quality of the video call.

FIG. 5 is a flowchart illustrating a procedure of measuring the quality of a video call by the configuration of FIG. 4.

Referring to FIG. 5, when a video call call is formed between the calling video terminal 10 and the called video terminal 10 (S501), the calling video terminal 10 and the called video terminal 20 are formed using the formed video call call. The video reproduced on the display unit is transmitted to the video call quality measuring apparatus 30 through the TV-OUT line of the video terminal (S503). In this case, the playback image of the video terminal transmitted from the calling video terminal 10 and the called video terminal 20 passes through the TV / USB video signal converter 40 and is directly connected to the TV-OUT line of the video terminal. The TV / USB video signal converter 40 converts the playback video received from the video terminal into a USB video signal and transmits the same to the video call quality measuring device 30.

After step 503, the video call quality measuring device 30 extracts a transmission video transmitted from the transmission video terminal 10 to the reception video terminal 20 from the playback video of the transmission video terminal 10 received, and receives the reception video. The called video terminal 20 extracts the received video from the calling video terminal 10 from the playback video of the terminal 20 (S505). In this case, a predetermined frame may be extracted in real time with respect to the playback video received from the video terminal, and preferably 15 frames per second may be extracted in real time.

Then, the video call quality measuring device 30 measures the quality of the video call by comparing the extracted video (S507). A detailed description of step 507 will be given later with reference to FIG. 7.

6 is a diagram illustrating a configuration of a video terminal and a video call quality measuring apparatus for explaining the video call quality measuring procedure of FIG. 5.

Referring to FIG. 6, the calling video terminal 10 and the called video terminal 20 are composed of a camera, a video codec, an H.324M protocol stack, a CS video call bearer channel, and a display unit. The calling video terminal 10 and the called video terminal 20 perform a video call through a mobile communication network by a CS video call bearer channel.

On the other hand, the video of the user of the calling video terminal is input by the camera of the calling video terminal 10, and reproduced through the display unit together with the video of the user of the called video terminal received from the called video terminal 20, The video is transmitted to the video call quality measurement device 30 through the TV-OUT line. Similarly, the incoming video terminal 20 is inputted by the camera of the incoming video terminal 20, and the user's video of the called terminal is received through the display unit together with the video of the user of the calling video terminal received from the calling video terminal 10. The playback image is transmitted to the video call quality measurement device 30 through the TV-OUT line.

The video call quality measuring apparatus 30 that receives the video played back from the calling video terminal 10 and the called video terminal 20 through the TV-OUT line extracts a video necessary to measure video call quality from the played video. do. According to an embodiment of the present invention, a video of a user of a calling video terminal, which is a transmitting video transmitted by the calling video terminal 10, and a received video received by the called video terminal 20 are extracted in real time. Then, the video call quality is measured by comparing the video extracted from the playback video received from the calling video terminal 10 and the called video terminal 20, respectively.

FIG. 7 illustrates a detailed description of step 507 of measuring video call quality by comparing images extracted by the video call quality measuring apparatus.

In operation 507, the video call quality is measured by comparing the extracted video by the video call quality measuring apparatus 30, the transmission video transmitted by the calling video terminal 10 extracted by the video call quality measuring apparatus 30 and the incoming video terminal. The received image 20 synchronizes the received image (S701). Here, the synchronization process of step 701 will be described in detail with reference to FIG. 8.

The quality of the video call is measured by comparing the transmitted video transmitted by the synchronized outgoing video terminal 10 and the received video received by the incoming video terminal 20 (S703). The measuring method may be performed by comparing two images to be compared with each other, and measuring OME (Mean Opinion Score), PNSR, Blur, Blockiness, and Jerkiness.

Meanwhile, in the present invention, the transmission video transmitted by the calling video terminal 10 is set as the reference video, and the incoming video terminal 20 compares the received video received from the calling video terminal 10 with the reference video to perform the video call. Quality can be measured. In this case, the camera and video codec characteristics of the video terminal may be accurately reflected without distortion, and the actual video call quality that combines the quality of the camera and video codec of the video terminal and the quality of the communication network may be most accurately reflected.

In addition, when a video call is performed through a video call, the video is transmitted and received between video terminals, and the video transmitted from the incoming video terminal 20 to the outgoing video terminal 10 is replaced by a preset video terminal 20. It may be composed of an image, in which case the substitute image becomes a reference image. On the other hand, the video call quality measurement apparatus 30 extracts the replacement image which is the image received by the calling video terminal 10 from the playback video of the calling video terminal 10 received from the calling video terminal 10, the extracted replacement video The video call quality can also be measured by comparing the previously stored comparison video with. Here, the comparison video is the same video as the replacement video set by the incoming video terminal 20. As described above, when the incoming video terminal 20 transmits the replacement video to the calling video terminal 10 to measure the video call quality, the characteristics of the video that the reference video should have for the video call quality measurement (for example, the video change). , Video frequency distribution, video brightness, etc.), and since the alternative video is used as the reference video, the video call quality of the communication terminal excluding the camera and video codec quality of the video terminal can be accurately measured. Will be.

FIG. 8 is a diagram for explaining a step 701 of synchronizing a transmission video of an originating video terminal and a reception video of an incoming video terminal extracted by the apparatus for measuring video call quality.

Referring to FIG. 8, the video call quality measurement apparatus 30 synchronizes the extracted transmission image transmitted by the extracted transmission video terminal 10 and the compressed image of the transmission image extracted from the transmission video terminal 10 (S801). Here, the compressed video of the transmission video extracted from the transmission video terminal 10 can be obtained by extracting the transmission H.263 or MPEG4 SDU through the DM interface of the transmission video terminal 10, and synchronizing is one-to-one for each frame. Means to match.

After step 801, the I-frame of the compressed image for the transmission image extracted from the originating video terminal 10 and the I-frame of the compressed image for the received image extracted from the incoming video terminal 20 are synchronized (S803). Here, since the compressed image of the received image extracted from the incoming video terminal 20 is the same as described above, it will be omitted.

Then, the I-frame of the compressed image with respect to the received image extracted from the called image terminal 20 and the extracted received image received by the extracted called image terminal 20 are synchronized (S805).

After the steps 801 to 805, the transmission video transmitted by the calling video terminal 10 extracted by the video call quality measuring apparatus 30 and the reception video received by the called video terminal 20 may be synchronized.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments. It will be apparent to those skilled in the art that variations, modifications, and improvements can be made.

1 is a diagram illustrating a concept of a method for measuring call quality of a video call;

2 is a view for explaining a method for measuring call quality using a conventional WCDMA wireless data modem;

3 is a view for explaining a method of using a conventional reference image server.

4 is a diagram illustrating a configuration for measuring video call quality according to an exemplary embodiment of the present invention.

5 is a flowchart illustrating a procedure of measuring the quality of a video call by the configuration of FIG. 4;

6 is a diagram illustrating a configuration of a video terminal and a video call quality measuring apparatus for explaining the video call quality measuring procedure of FIG. 5.

FIG. 7 illustrates a detailed description of step 507 of measuring video call quality by comparing images extracted by the video call quality measuring apparatus.

FIG. 8 is a diagram for explaining a step 701 of synchronizing a transmission video of an originating video terminal and a reception video of an incoming video terminal extracted by the apparatus for measuring video call quality.

Claims (8)

In the method for measuring the video call quality between the calling video terminal and the called video terminal, Forming a video call call between the calling video terminal and the called video terminal; Transmitting a video played by the calling video terminal and the called video terminal to a video call quality measuring apparatus through a TV-OUT line using the formed video call call; Extracting, by the apparatus for measuring video call quality, a transmission image of the outgoing video terminal from a playback image of the outgoing video terminal, and extracting a reception image of the incoming video terminal from a playback image of the incoming video terminal; Synchronizing the extracted transmission video of the extracted outgoing video terminal and the reception video of the incoming video terminal; And Measuring the quality of a video call by comparing the transmitted video of the synchronized outgoing video terminal with the received video of the incoming video terminal; Including but not limited to: The step of measuring the quality of the video call by comparing the transmission video of the outgoing video terminal and the received video of the incoming video terminal, the outgoing video terminal from the incoming video terminal by using the transmission video of the outgoing video terminal as a reference video; The video call quality measurement method using the TV-OUT function of the video terminal, characterized in that for measuring the quality of the video call by comparing the received video received from the terminal with the reference video. The method of claim 1, The transmitting of the video played by the calling video terminal and the called video terminal to the video call quality measuring apparatus through the TV-OUT line using the formed video call call, The video call quality measurement method using the TV-OUT function of the video terminal, characterized in that the reproduced video is transmitted through the TV / USB video signal converter. The method of claim 1, The extracting of the transmission video of the calling video terminal from the playback video of the calling video terminal received by the video call quality measurement apparatus, and extracting the received video of the called video terminal from the playback video of the called video terminal, And a predetermined frame of a received image is extracted in real time from the transmitted image and the reproduced image of the called image terminal in real time from the reproduced image of the calling video terminal. delete The method of claim 1, Synchronizing the extracted transmission video of the extracted outgoing video terminal and the received video of the incoming video terminal, Synchronizing a compressed image of the extracted transmission image of the extracted transmission video terminal and the transmission image extracted from the transmission video terminal; Synchronizing the I-frame of the compressed image with respect to the transmitted image extracted from the originating video terminal and the I-frame of the compressed image with respect to the received image extracted from the called video terminal; Synchronizing the I-frame of the compressed video with respect to the received video extracted from the called video terminal and the received video of the extracted called video terminal; And Synchronizing the transmission video of the extracted outgoing video terminal and the reception video of the extracted incoming video terminal; Video call quality measurement method using a TV-OUT function of a video terminal comprising a. delete The method of claim 1, The video transmitted from the called video terminal to the calling video terminal through the video call is an alternative video set in advance by the called video terminal, and from the playback video of the calling video terminal received by the video call quality measuring device, Extracting the substitute video which is the received video of the calling video terminal, and measuring the video call quality by comparing the extracted substitute video with the comparison video previously stored by the apparatus; Video call quality measurement method using the TV-OUT function of the video terminal further comprising. In the video call quality measuring apparatus for measuring the video call quality between the calling video terminal and the called video terminal, Means for receiving a video played by the calling video terminal and the called video terminal through a TV-OUT line by using the formed video calling call when the video call is formed between the calling video terminal and the called video terminal; Means for extracting a transmission video of the originating video terminal from the playback video of the calling video terminal and extracting a reception video of the called video terminal from the playback video of the called video terminal; Means for synchronizing the extracted transmission video of the originating video terminal and the reception video of the incoming video terminal; And Means for measuring the quality of a video call by comparing the transmitted video of the synchronized outgoing video terminal with the received video of the incoming video terminal Including, The means for measuring the quality of a video call by comparing the transmitted video of the outgoing video terminal with the received video of the incoming video terminal is based on the transmitted video of the outgoing video terminal as the reference video, and the outgoing video from the incoming video terminal. The video call quality measuring apparatus, characterized in that for measuring the quality of the video call by comparing the received video received from the terminal with the reference video.

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