KR20080002138A - Methodology and system for quality test of multimedia data service - Google Patents

Abstract

A multimedia QoS(Quality of Service) measurement method and a system thereof are provided to measure multimedia QoS by using a high-speed Internet service network of an ISP(Internet Service Provider), and to measure multimedia QoS between a high-speed Internet service subscriber and a high-speed Internet service provider, thereby a higher-quality service can be offered. A multimedia service server registers a multimedia service(21). The server collects received multimedia video data to bring the data to a measurement device, and collects multimedia QoS data received from a high-speed Internet service subscriber side to bring the collected data to the measurement device(22). In case of an FR(Full Reference) test, the brought two data are compared and converted into evaluation and decision values to calculate the values(231). In case of an NR(No Reference) test, video quality measurement values are objectively calculated(232). Quality measurement items are displayed with the calculated measurement values(24). The measurement results are displayed on a screen, and are stored in a storage space(25).

Description

Methodology and System for Measuring Quality of Multimedia Service {Methodology and System for Quality Test of Multimedia Data Service}

1 is a configuration diagram of an entire system for explaining a method and system for measuring a multimedia service quality according to an embodiment of the present invention;

2 is a flowchart illustrating in detail the step-by-step performance of the method for measuring a multimedia service quality according to an embodiment of the present invention;

3 is a block diagram of a method for measuring a quality of a multimedia service image;

4 is a diagram illustrating a measurement screen of a system used for quality measurement in a system for measuring quality of a multimedia service image according to the present invention;

[Description of Symbols for Main Parts of Drawing]

11: ISP Service Provider

12: network used

     xDSL: x Digital Subscriber Line

     HFC: Hybrid Fiber Coaxial

     FTTH: Fiber To The Tome

     Ubiquitous: Broadband + Wireless + Satellite Network

13: Internet service subscriber

14: Multimedia service quality measurement system according to the present invention

15: How to measure quality

     FR: Full Reference / NR: No Reference

16: flow of multimedia service data

The present invention relates to a method for estimating the image quality of the multimedia data actually transmitted by accessing the web of the subscriber of the high speed internet service through the image quality algorithm, for the efficient quality prediction of the multimedia service using the ISP high speed internet service network. will be.

Comparing and analyzing the prior art patent application technology and the present invention, first, 'the method and device for measuring the quality of service from the user's point of view in a wired and wireless communication network (application number: 10-2000-0003515)' access to the Web of the high-speed Internet service subscribers The quality of data transmission was determined by using parameters such as data rate, transmission delay, loss, and delay variation. This is a measurement method in contrast with the image quality measurement according to 16 measurement items of the quality measurement (FR test, NR test) of various images according to the present invention. In addition, the quality of the image is objectively evaluated by comparing the received image and the original measured multimedia image by transmitting the original measured multimedia image data to the subscriber network of the high speed Internet service through the high speed Internet network. This method is influenced by the qualities of the person who recognizes and judges the image, and the method of comparing the original measured multimedia image and the original measured multimedia image always provides two images in the subscriber network of the high-speed Internet service. It is inconvenient to measure and have an inefficiency by putting a load on the high speed Internet network that is actually being serviced.

Second, 'Digital Multimedia Broadcasting System (Application No .: 10-2003-0032396)' relates to a digital multimedia broadcasting system that allows a user to receive or listen to content provided through the digital multimedia broadcasting receiving apparatus. There is a problem in that it does not provide a method for measuring the quality of the serviced image and thus does not guarantee stable and reliable service.

At present, the measurement target of the present invention is applied to various subscriber network environments 12 such as xDSL, HFC, leased line, broadband network such as FTTH, wireless communication network, and satellite network as shown in FIG. Although the quality of each Internet service subscriber 13 network is measured 15 using the image quality measuring device 14, the multimedia quality measurement system between the high speed ISP service provider 11 and the high speed Internet subscriber 13 is conventionally known. According to the present invention, since there is no situation, it is possible to provide a higher quality service for the multimedia service.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and system for measuring multimedia video quality using a high speed Internet service network of an ISP and measuring multimedia video quality between a high speed Internet service provider and a high speed Internet service subscriber (End-to-End). To build.

In order to achieve the object of the present invention described above, the method for measuring the quality of multimedia data using the 'multimedia service quality measuring method and system thereof' according to the present invention is the same as FIG.

A first step of waiting for measurement after registering 21 with a multimedia service server such as a VoD service or an IPTV of an ISP;

When using the method of measuring multimedia image quality by comparing the original multimedia image data with the multimedia image data received from the subscriber of the high speed Internet service (FR Test), the received multimedia image data is collected and brought to the measuring device before being transmitted. In the case of importing image data to a measurement device or measuring quality using only multimedia image data received from the subscriber of the high speed Internet service (NR Test), the multimedia image quality data received from the subscriber of the high speed Internet service is collected and measured. A second step of selecting (22) information depending on the characteristics of the codec by selecting the multimedia image codec to be measured to be brought to the device;

In the case of FR Test, the two data sent to the measuring device are compared and the difference between the two images is compared and calculated through image quality measurement software. A third step of objectively calculating (232) an image quality measurement value through an algorithm (image quality measurement software) capable of objectively measuring multimedia image quality using only data sent to the measurement device;

A fourth step of displaying (24) the Blur, Blockiness, and PSNR values of the quality measurement item (ITU-T.J.144) with the measured values calculated above;

And a fifth step of displaying the measurement result measured on the screen and storing the measurement result value in the storage space (25).

Hereinafter, a method and system for measuring a multimedia quality of service according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a configuration diagram of a method for measuring the quality of a multimedia service image according to an embodiment of the present invention. The FR 31 test method compares original multimedia image data with multimedia image data received from a subscriber of a high-speed Internet service. The measuring algorithm is a method of measuring the quality of an image.

PSNR (311) method for measuring the ratio of the signal (Signal) and noise (Noise) can be obtained as follows.

The MSE 312 method for measuring the error rate can be obtained by the following equation.

The MSAD / Delta 313 method for measuring the difference in color components of an image can be obtained as follows.

The SSIM 314 method for measuring three similarities (Luminance, Contrast, Structural Similarity) can be obtained as follows.

The VQL 315 method for measuring the quality of the image data is to perform color transformation on the original data, contrast the DCT-based region, and perform pooling based on the weight to obtain the VQM distortion data as a result. The Blur 316 method is used to measure the amount of blurring of the video image, and the Blockingness 317 method is used to measure distortion of adjacent block boundaries.

The NR 32 test method according to FIG. 3 is a method of measuring the quality of an image using only multimedia image data received from a subscriber of a high speed internet service. The measurement algorithm is as follows.

The PSNR 321 measurement method extracts a slope map and a feature map with respect to a received image and obtains an NR PSNR 312 value through noise measurement.

The JQM 322 method using the JPEG quality measurement algorithm can be obtained by the following equation.

The Blur 323 method is used to find the vertical vertex of the image data and measure the amount of blurring of the image, and the Blockingness 324 method is used to measure the distortion of adjacent block boundaries of the image.

4 is a diagram illustrating a measurement screen of a system used for quality measurement in a system for measuring quality of a multimedia service image according to the present invention. 4 (1) shows a quality measurement execution screen 41 for multimedia service data according to the FR test method 31. After selecting the measurement item 411 on the measurement screen 41, the 'press' button is pressed. When clicked, the measured result is displayed on the screen (412).

4 (2) shows a quality measurement execution screen 42 for multimedia service data according to the NR test method 32. After selecting the measurement item 421 on the measurement screen 42, the 'press' button If you click, you can see that the measured result is displayed 422.

Until the present invention, the multimedia service has been provided to ISP service subscribers without a precise measurement standard and a reference plan in the multimedia image service provided by an ISP service company. According to the present invention, a complete reference (FR) test is performed between the original multimedia image data and the multimedia image data received by the subscriber in the multimedia service image, and the non-reference (NR) test is performed only on the multimedia image data received by the subscriber. If implemented, the quality of multimedia service images can be measured accurately and variously, and can be used as a measurement method and system for setting a standard plan for providing high quality video services by setting service guidelines.

In addition, since there is no service method and system in the country such as the present invention, if the technology to be achieved by the present invention is successful, it will contribute a lot to the national competitiveness.

Claims (10)

In the multimedia service quality measurement method comprising a multimedia data service between an ISP service provider, an Internet service subscriber, and a mobile Internet service subscriber, A first step of waiting for measurement after registering 21 with a multimedia service server such as a VoD service or an IPTV of an ISP; When using the method of measuring multimedia image quality by comparing the original multimedia image data with the multimedia image data received from the subscriber of the high speed Internet service (FR Test), the received multimedia image data is collected and brought to the measuring device before being transmitted. In the case of importing image data to a measurement device or measuring quality using only multimedia image data received from the subscriber of the high speed Internet service (NR Test), the multimedia image quality data received from the subscriber of the high speed Internet service is collected and measured. A second step of selecting (22) information depending on the characteristics of the codec by selecting the multimedia image codec to be measured to be brought to the device; In the case of FR Test, the two data sent to the measuring device are compared and the difference between the two images is compared and calculated through image quality measurement software. A third step of objectively calculating (232) an image quality measurement value through an algorithm (image quality measurement software) capable of objectively measuring multimedia image quality using only data sent to the measurement device; A fourth step of displaying (24) the Blur, Blockiness, and PSNR values of the quality measurement item (ITU-T.J.144) with the measured values calculated above; And a fifth step of displaying the measurement result measured on the screen and storing the measurement result value in a storage space (25). The method of claim 1, wherein the network environment is applied to various ubiquitous network environments such as xDSL, HFC, leased lines, broadband networks such as FTTH, wireless communication networks, and satellite networks. The method of claim 1, wherein the multimedia quality of service is measured by comparing the original multimedia image data with the multimedia image data received from the subscriber of the high-speed Internet service, and using only the FR test method for measuring the multimedia image quality and the multimedia image data received from the subscriber of the high-speed Internet service. Various multimedia video quality measurement methods using the NR test measurement method to measure the quality. The method of claim 3, wherein the FR test measurement method includes measurement items such as RGB, MSE, MSAD, SSIM, BLUR, PSNR, RMSE, Delta, VQM, Blockingness. 4. The method of claim 3, wherein the NR test measurement method includes measurement items such as RGB, PSNR, BLUR, JQM, Blockingness. The method according to any one of claims 1 to 2, wherein some networks are applied in various ubiquitous network environments. The method according to any one of claims 1 to 3, wherein the multimedia service quality measurement is performed by adopting an incomplete reference (FR) test method or a non-reference (NR) test method. In the multimedia service quality measurement system including multimedia data service between ISP service provider, Internet service subscriber, and mobile Internet service subscriber, A device waiting for measurement after registering 21 with a multimedia service server such as a VoD service or an IPTV of an ISP; When using the method of measuring multimedia image quality by comparing the original multimedia image data with the multimedia image data received from the subscriber of the high speed Internet service (FR Test), the received multimedia image data is collected and brought to the measuring device before being transmitted. In the case of importing image data to a measurement device or measuring quality using only multimedia image data received from the subscriber of the high speed Internet service (NR Test), the multimedia image quality data received from the subscriber of the high speed Internet service is collected and measured. A device for selecting the measurement target multimedia image Codec to be brought to the device and determining (22) information depending on the characteristics of the codec; In the case of FR Test, the two data sent to the measuring device are compared and the difference between the two images is compared and calculated through image quality measurement software. An apparatus for objectively calculating (232) an image quality measurement value through an algorithm (image quality measurement software) capable of objectively measuring multimedia image quality using only data sent to the measurement apparatus; An apparatus for displaying (24) the Blur, Blockiness, and PSNR values of the quality measurement item (ITU-T.J.144) with the measured values calculated above; And displaying a measurement result on the screen and storing the measurement result value in a storage space. 10. The system of claim 8, wherein the network system is applied to various ubiquitous network environments such as xDSL, HFC, leased line, broadband network such as FTTH, wireless communication network, and satellite network. 10. The system of claim 9, wherein the multimedia service quality measurement system compares original multimedia image data with multimedia image data received from a subscriber of a high speed Internet service and measures the multimedia image quality. Various multimedia video quality measurement system using NR test measurement system to measure the quality with only.

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