WO2012029648A1 - サーバ装置、映像品質計測システム、映像品質計測方法およびプログラム - Google Patents
サーバ装置、映像品質計測システム、映像品質計測方法およびプログラム Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
- H04L65/762—Media network packet handling at the source
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/80—Responding to QoS
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
- H04N21/2402—Monitoring of the downstream path of the transmission network, e.g. bandwidth available
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
- H04N21/47202—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
Definitions
- the present invention is based on the priority claim of Japanese patent application: Japanese Patent Application No. 2010-192589 (filed on August 30, 2010), the entire contents of which are incorporated herein by reference. Shall.
- the present invention relates to a server device, a video quality measurement system, a video quality measurement method, and a programgram.
- a server device that measures displayed video quality, a remote-type video quality measurement system, a video quality measurement method, and a program.
- Patent Document 1 describes a traffic control system that performs traffic control.
- the traffic control system includes a means for measuring communication quality of a communication line between a relay server (thin client server) and a client, and a distribution in which the amount of moving image data distributed from the distribution server to the relay server is specified based on the communication quality. And a control means for controlling the quantity.
- the response time of the screen data or the response time by ping transmission is measured.
- a relatively low-speed transmission path such as a telephone line or wireless communication is used between a server device and a terminal device having only a relatively low processing capacity such as a portable terminal.
- a data transmission system that performs display with practical quality and time.
- the server device converts the quality and data format of the data content on the server device side according to the processing capability of the terminal device, and then transmits the data to the terminal device.
- the video quality is measured on the server device side, and the restrictions on the maximum transmission speed and the transfer delay in the mobile packet network are necessary to implement the thin client service. It is necessary to determine whether there is no problem in terms of quality and response time.
- the server device only measures the response time, and cannot determine the quality of the objective quality of the video.
- the server device since the server device does not measure response time and video quality, the objective quality of video cannot be evaluated.
- the objective quality refers to the quality of video and audio based on measurement of a physical quantity that can be measured, unlike the subjective quality based on psychological evaluation when a human actually views video and audio.
- An object of the present invention is to provide a server device, a video quality measurement system, a video quality measurement method, and a program for solving such a problem.
- the server device provides: A server device connected to a mobile terminal via a packet transfer device on a mobile network, A compression encoding unit that compresses and encodes screen information or image information downloaded from a web server on the Internet in response to an instruction from a mobile terminal; A packet transmission unit for storing an output signal from the compression encoding unit in a packet and sending the output signal to the mobile terminal via the packet transfer device; A video quality measuring unit that measures video quality with reference to an input signal to the compression encoding unit, a signal obtained by decoding an output signal from the compression encoding unit, a packet transmission timing, and a packet reception timing by the mobile terminal; It has.
- the video quality measuring method is: A server device connected to a mobile terminal via a packet transfer device on a mobile network compresses and encodes screen information or image information downloaded from a web server on the Internet in response to an instruction from the mobile terminal; Storing an output signal by compression encoding in a packet and sending it to a mobile terminal via a packet transfer device; A step of measuring video quality with reference to an input signal to compression encoding, a signal obtained by decoding an output signal by compression encoding, a packet transmission timing, and a packet reception timing by a portable terminal.
- the program according to the third aspect of the present invention is: A process of compressing and encoding screen information or image information downloaded from a web server on the Internet in response to an instruction from a mobile terminal; A process of storing an output signal by the compression encoding in a packet and sending it to the mobile terminal via a packet transfer device on a mobile packet network; A process of measuring video quality with reference to an input signal to the compression encoding, a signal obtained by decoding an output signal by the compression encoding, a transmission timing of the packet, and a reception timing of the packet by the mobile terminal; The program is executed by a computer connected to the portable terminal via a packet transfer device. The program may be recorded on a non-transient computer-readable recording medium.
- the server device when the mobile terminal operates while communicating with the server device via the packet transfer device on the mobile network, it is displayed on the mobile terminal.
- the objective quality of the video can be measured on the server device side.
- a server device According to the first development form, a server device according to the first viewpoint is provided.
- the video quality measurement unit calculates a PSNR (Picture Signal to Noise Ratio) based on an input signal to the compression encoding unit and a signal obtained by decoding the output signal from the compression encoding unit, and a packet.
- a server device is provided that calculates a response time based on the transmission timing of the packet and the reception timing of the packet by the mobile terminal, and obtains video quality from the calculated PSNR and response time.
- the video quality measurement unit obtains video quality by adding the PSNR and the response time while weighting each.
- an input signal to the compression encoding unit, an output signal from the compression encoding unit or a signal obtained by decoding the output signal from the compression encoding unit, a packet transmission timing, and a packet reception timing by the portable terminal There is provided a server device that further includes a storage unit for storing.
- a playback unit that receives a packet from the server device via a mobile network, decodes an output signal from a compression encoding unit stored in the packet by a decoder, and displays a screen;
- a mobile terminal is provided that includes a transmission unit that stores the reception timing in the reception response and transmits the reception timing to the server device.
- a video quality measurement system including the server device and the mobile terminal is provided.
- a video quality measurement system in which the mobile network is a mobile packet network or a mobile LTE / EPC network.
- a video quality measurement system in which the packet transfer device is an xGSN device or an S / P-GW device.
- the video quality measuring method according to the second viewpoint is provided.
- FIG. 1 is a block diagram showing the configuration of the server device 10 of this embodiment.
- a server device 10 is a server device connected to a mobile terminal via a packet transfer device on a mobile network, and is a screen downloaded from a web server on the Internet in response to an instruction from the mobile terminal.
- a compression encoding unit 86 that compresses and encodes information or image information; a packet transmission unit 76 that stores an output signal from the compression encoding unit 86 in a packet and sends the packet to a mobile terminal via a packet transfer device; and a compression encoding unit A video quality measuring unit 82 that measures video quality with reference to an input signal to 86, a signal obtained by decoding an output signal from the compression encoding unit 86, a packet transmission timing, and a packet reception timing by the mobile terminal; It has.
- the video quality measuring unit 82 calculates PSNR (Picture Signal to Noise Ratio) based on the input signal to the compression encoding unit 86 and the signal decoded from the output signal from the compression encoding unit 86, and also receives the signal from the packet transmission unit 76.
- the response time may be calculated based on the packet transmission timing and the packet reception timing by the mobile terminal, and the video quality may be obtained from the calculated PSNR and response time.
- the video quality measuring unit 82 may obtain the video quality by adding the PSNR and the response time while weighting each.
- the server device 10 also includes an input signal to the compression encoding unit 86, an output signal from the compression encoding unit 86, a signal obtained by decoding the output signal from the compression encoding unit 86, a packet transmission timing from the packet transmission unit 76, and
- the information processing apparatus may further include a storage unit that stores packet reception timings by the mobile terminal.
- the mobile terminal receives the packet from the server device 10 via the mobile network, decodes the output signal from the compression encoding unit 86 stored in the packet by a decoder, and displays a screen; It is preferable to include a transmission unit that stores the reception timing in the reception response and transmits the reception timing to the server device 10. Furthermore, according to the present invention, a video quality measurement system including the server device 10 and the portable terminal is provided.
- the mobile terminal when the mobile terminal operates while communicating with the server device 10 via the packet transfer device on the mobile network, the mobile terminal It is possible to measure the objective quality of the video displayed on the server device 10 side.
- FIG. 2 is a diagram showing a connection configuration of the video quality measurement system according to the present embodiment.
- FIG. 2 shows a configuration when a 3G mobile packet network is used as the mobile network and an xGSN device is used as the packet transfer device.
- a server device 110, an xGSN device 190, RNC devices 195 and 196, and base stations 193 and 194 are provided on the mobile packet network 150.
- the server device 110 is connected to a web server 100 on the Internet.
- the xGSN device refers to a device in which an SGSN (Serving GPRS Support Node) device and a GGSN (Gateway GPRS Support Node) device are integrated.
- SGSN Serving GPRS Support Node
- GGSN Gateway GPRS Support Node
- FIG. 2 shows the case of the thin client service as an example, but the present invention can also be applied to other services.
- the mobile terminal 170 connects to the first virtual client of the server device 110 arranged on the mobile packet network 150 and operates the content (for example, video) of the Web server 100 on the Internet.
- an instruction signal is transmitted to the server apparatus 110 via the base station 193, the RNC (Radio Network Controller) apparatus 195, and the xGSN apparatus 190.
- the instruction signal refers to a signal transmitted from the mobile terminal 170 by a key operation or special character input on the mobile terminal 170.
- the instruction signal transmitted from the mobile terminal 170 arrives in order of the base station 193, the RNC device 195, the xGSN device 190, and the server device 110 on the mobile packet network 150. In this way, the server device 110 receives the instruction signal from the mobile terminal 170.
- a known protocol can be adopted as the instruction signal protocol.
- TCP / IP Transmission Control Protocol / Internet Protocol
- HTTP Hypertext Transmission Protocol
- SIP Session Initiation Protocol
- the server device 110 is connected to a monitor device (not shown).
- the monitor device displays the measurement result of the video quality received by the mobile terminal, the response time until the video is received by the mobile terminal, and the like.
- FIG. 3 is a block diagram showing the configuration of the server device 110.
- the server apparatus 110 includes N virtual client units 211_1 to 211_N, a decoding unit 183, a storage unit 185, and a video quality measurement unit 182.
- the server apparatus 110 includes N virtual client units 211_1 to 211_N.
- N for example, N ⁇ 2.
- the portable terminal 170 connects to the 1st virtual client part 211_1 is demonstrated. That is, the first virtual client unit 211_1 is connected to the first mobile terminal 170, and the Nth virtual client unit 211_N is connected to another mobile terminal.
- the virtual client unit 211_1 exchanges control signals such as instruction signals (broken lines in FIG. 3) from the portable terminal 170 with the xGSN device 190, and transmits a screen compression code signal and audio to the portable terminal 170.
- a data signal (solid line in FIG. 3) such as a compressed code signal is output.
- FIG. 4 is a block diagram showing a configuration of the first virtual client unit 211_1. Note that the configurations of the virtual client units 211_2 to 211_N are the same as the configuration of the virtual client unit 211_1, and thus the description of these configurations is omitted.
- the virtual client unit 211_1 includes a control signal transmission / reception unit 173, an image decoding unit 180, a screen capture unit 181, a compression encoding unit 186, a packet transmission unit 176, and a packet reception unit 177.
- the control signal transmission / reception unit 173 receives an instruction signal from the mobile terminal 170 via the xGSN device 190.
- the instruction signal is an instruction signal for starting an application for browsing a moving image content site on the web server 100 on the Internet.
- control signal transmission / reception unit 173 When receiving the instruction signal, the control signal transmission / reception unit 173 connects to the web server 100 on the Internet having the connection destination URL or IP address stored in the instruction signal. The control signal transmission / reception unit 173 downloads the moving image content file from the web server 100, extracts image data from the file, and outputs the image data to the image decoding unit 180.
- the image decoding unit 180 decodes the image data, and outputs the decoded image signal to the screen capture unit 181 and the storage unit 185 in FIG.
- the screen capture unit 181 captures all or a part of the screen at a predetermined screen resolution and outputs the captured screen to the compression encoding unit 186.
- the compression encoding unit 186 compresses and encodes the output image data from the screen capture unit 181 by a predetermined compression encoding method, and outputs the compressed code to the packet transmission unit 176.
- the packet transmission unit 176 receives the compression code output from the compression encoding unit 186, stores it in the payload portion of the packet, and sends the packet to the xGSN device 190.
- a packet is transmitted by a protocol based on RTP / UDP (Real-time Transport Protocol / User Datagram Protocol). Other protocols can also be used.
- RTP / UDP Real-time Transport Protocol / User Datagram Protocol
- Other protocols can also be used.
- the packet sending unit 176 sends each RTP packet after giving an RTP time stamp and a sequence number (SN: Sequence Number).
- the packet transmission unit 176 outputs the time stamp value and sequence number of each packet to the storage unit 185.
- the accumulation unit 185 accumulates a time stamp value and a sequence number for each virtual client session.
- the packet receiving unit 177 receives a response packet for each packet transmitted from the packet transmitting unit 176 from the portable terminal 170 via the xGSN device 190.
- the packet reception unit 177 reads the sequence number of the corresponding transmission packet stored in the response packet and the reception time information received by the mobile terminal 170, and outputs to the storage unit 185 for each session.
- the storage unit 185 The sequence number and reception time information are stored every time.
- the decoding unit 183 receives the output signal of the compression encoding unit 186 in FIG. 4, decodes the output signal of the compression encoding unit 186 using the decoder of the same codec, and outputs it to the storage unit 185.
- the storage unit 185 receives, for each session, an input signal of the compression encoding unit 186, an output signal of the decoding unit 183, a time stamp and sequence number at the time of packet transmission from the packet transmission unit 176, and a packet reception unit 177.
- the time stamp and sequence number at the time of packet reception at the portable terminal from are stored.
- FIG. 5 is a block diagram showing the configuration of the video quality measuring unit 182. As shown in FIG. Referring to FIG. 5, the video quality measurement unit 182 includes a response time calculation unit 200, an image quality calculation unit 201, and a video quality calculation unit 202.
- the video quality measurement unit 182 uses the information stored in the storage unit 185 to calculate image quality and delay quality.
- the video quality measuring unit 182 designates a session for a virtual client that requires video quality measurement, reads the stored information from the storage unit 185, and calculates a video quality index.
- the image quality calculation unit 201 calculates a PSNR (Picture Signal to Noise Ratio) between the output signal of the image decoding unit 180 and the output signal of the compression encoding unit 186 and outputs the PSNR (Picture Signal to Noise Ratio) to the video quality calculation unit 202.
- PSNR Physical Signal to Noise Ratio
- the response time calculation unit 200 uses the transmission time stamp (from the packet transmission unit 176) based on the sequence number of the transmission packet from the packet transmission unit 176 and the sequence number of the response packet from the packet reception unit 177 stored in the storage unit 185.
- the transmission time is associated with the reception time stamp (reception time) from the packet reception unit 177, and the response time ⁇ is calculated by the following equation (1).
- the response time calculation unit 200 outputs the calculated response time ⁇ to the video quality calculation unit 202.
- the video quality calculation unit 202 uses the PSNR input from the image quality calculation unit 201 and the response time ⁇ input from the response time calculation unit 200 to calculate and output a comprehensive video quality index according to the following equation.
- Total video quality index ⁇ 1 * PSNR + ⁇ 2 * ⁇ (2)
- Equation (2) are weighting factors, and are set to appropriate values.
- server device 110 may connect to a content distribution server instead of the web server 100 and read a file or stream of content to be viewed from the content distribution server.
- the server apparatus 110 measures the video quality while performing the thin client service. Therefore, the server apparatus 110 determines whether there is no problem in terms of video quality and response time when the maximum transmission rate limitation and the transfer delay limitation in the mobile packet network 150 are implemented in the thin client service. can do.
- FIG. 6 is a diagram showing a connection configuration of the video quality measurement system of the present embodiment. Since components having the same reference numerals between FIG. 6 and FIG. 2 perform the same operation, description of these operations is omitted.
- the mobile terminal 670 of FIG. 6 is connected to the server via e-NodeB (enhanced-NodeB) devices 305 and 306 and the S / P-GW device 304 via the mobile LTE / EPC network 350. It is different in that it is connected to the device 110. According to the configuration of FIG. 6, much faster packet transfer is possible as compared with the mobile packet network 150 of FIG. 2.
- e-NodeB enhanced-NodeB
- the e-NodeB devices 305 and 306 use the LTE technology to realize packet transmission at a much higher speed than before in the wireless section with the mobile terminal 670. Further, the S / P-GW apparatus 304 and the server apparatus 110 are connected by the IP protocol. Therefore, the server apparatus 110 (FIG. 2) in the first embodiment can be used as it is for connection with the S / P-GW apparatus 304.
- the S / P-GW apparatus 304 receives a TCP / IP or UDP / IP protocol packet from the server apparatus 110 and a file transferred over those protocols, and receives a GTP-U (GPRS Tunneling Protocol-User Plane). After being converted into / TCP / IP or GTP-U / UDP / IP protocol, the compression-encoded bit stream or file is output to the e-NodeB devices 305 and 306.
- GTP-U GPRS Tunneling Protocol-User Plane
- the e-NodeB devices 305 and 306 convert the received compression-encoded bitstream or file into the PDCP / RLC protocol, and send the converted packet or file to the mobile terminal 670.
- adopting each of the structure of 2nd Embodiment and the structure of 3rd Embodiment is also employable.
- the xGSN device 190 in the second embodiment may be divided into an SGSN device and a GGSN device.
- SIP Session Initiation Protocol
- SDP Session Description Protocol
- a server device connected to a mobile terminal via a packet transfer device on a mobile network, A compression encoding unit that compresses and encodes screen information or image information downloaded from a web server on the Internet in accordance with an instruction from the mobile terminal; A packet transmission unit that stores an output signal from the compression encoding unit in a packet and sends the packet to the portable terminal via the packet transfer device; Video for measuring video quality with reference to an input signal to the compression encoding unit, a signal obtained by decoding an output signal from the compression encoding unit, a transmission timing of the packet, and a reception timing of the packet by the portable terminal
- a server device comprising: a quality measuring unit.
- the video quality measurement unit calculates a PSNR (Picture Signal to Noise Ratio) based on a signal obtained by decoding an input signal to the compression encoding unit and an output signal from the compression encoding unit, and the packet
- PSNR Physical Signal to Noise Ratio
- a playback unit for displaying a screen A mobile terminal comprising: a transmission unit that stores the reception timing of the packet in a reception response and transmits the packet to the server device.
- Appendix 6 The server device according to any one of Appendixes 1 to 4, A video quality measurement system comprising: the mobile terminal according to attachment 5.
- a server device connected to a mobile terminal via a packet transfer device on a mobile network compresses screen information or image information downloaded from a web server on the Internet in response to an instruction from the mobile terminal. Encoding process; Storing the output signal by the compression encoding in a packet and sending it to the mobile terminal via the packet transfer device; A step of measuring video quality with reference to an input signal to the compression encoding, a signal obtained by decoding an output signal by the compression encoding, a transmission timing of the packet, and a reception timing of the packet by the mobile terminal; A video quality measurement method characterized by comprising.
- PSNR Picture Signal to Noise Ratio
- a response time is calculated based on the reception timing of the packet by the mobile terminal, and the video quality is obtained from the calculated PSNR and response time.
- a PSNR Physical Signal to Noise Ratio
- a response time is calculated based on the reception timing of the packet by the portable terminal, and the computer is caused to execute a process for obtaining the video quality from the calculated PSNR and response time.
Abstract
Description
本発明は、日本国特許出願:特願2010-192589号(2010年8月30日出願)の優先権主張に基づくものであり、同出願の全記載内容は引用をもって本書に組み込み記載されているものとする。
本発明は、サーバ装置、映像品質計測システム、映像品質計測方法およびプログラムグラムに関し、特に、携帯端末がモバイルネットワーク上のパケット転送装置を介してサーバ装置と通信しながら動作する際に、携帯端末で表示される映像品質を計測するサーバ装置、リモート型の映像品質計測システム、映像品質計測方法およびプログラムに関する。
モバイルネットワーク上のパケット転送装置を介して携帯端末と接続されたサーバ装置であって、
携帯端末からの指示に応じてインターネット上のウェブサーバからダウンロードした画面情報または画像情報を圧縮してエンコードする圧縮エンコード部と、
圧縮エンコード部からの出力信号をパケットに格納するとともにパケット転送装置を介して携帯端末に送出するパケット送信部と、
圧縮エンコード部への入力信号、圧縮エンコード部からの出力信号をデコードした信号、パケットの送出タイミング、および、携帯端末によるパケットの受信タイミングを参照して、映像品質を計測する映像品質計測部と、を備えている。
モバイルネットワーク上のパケット転送装置を介して携帯端末と接続されたサーバ装置が、携帯端末からの指示に応じてインターネット上のウェブサーバからダウンロードした画面情報または画像情報を圧縮してエンコードする工程と、
圧縮エンコードによる出力信号をパケットに格納するとともにパケット転送装置を介して携帯端末に送出する工程と、
圧縮エンコードへの入力信号、圧縮エンコードによる出力信号をデコードした信号、パケットの送出タイミング、および、携帯端末によるパケットの受信タイミングを参照して、映像品質を計測する工程と、を含む。
携帯端末からの指示に応じてインターネット上のウェブサーバからダウンロードした画面情報または画像情報を圧縮してエンコードする処理と、
前記圧縮エンコードによる出力信号をパケットに格納するとともにモバイルパケットネットワーク上のパケット転送装置を介して前記携帯端末に送出する処理と、
前記圧縮エンコードへの入力信号、前記圧縮エンコードによる出力信号をデコードした信号、前記パケットの送出タイミング、および、前記携帯端末による前記パケットの受信タイミングを参照して、映像品質を計測する処理と、前記パケット転送装置を介して前記携帯端末と接続されたコンピュータに実行させる。なお、プログラムは、非トランジエント(non-transient)なコンピュータ読み取り可能記録媒体に記録されていてもよい。
図面を参照して、第1の実施形態に係るサーバ装置について詳細に説明する。
図2~図5を参照して、第2の実施形態に係る映像品質計測システムについて詳細に説明する。
第3の実施形態に係る映像品質計測システムについて図面を参照して説明する。図6は、本実施形態の映像品質計測システムの接続構成を示す図である。図6と図2との間で同一の番号が付された構成要素は同一の動作を行なうことから、これらの動作に関する説明を省略する。
前記携帯端末からの指示に応じてインターネット上のウェブサーバからダウンロードした画面情報または画像情報を圧縮してエンコードする圧縮エンコード部と、
前記圧縮エンコード部からの出力信号をパケットに格納するとともに前記パケット転送装置を介して前記携帯端末に送出するパケット送信部と、
前記圧縮エンコード部への入力信号、前記圧縮エンコード部からの出力信号をデコードした信号、前記パケットの送出タイミング、および、前記携帯端末による前記パケットの受信タイミングを参照して、映像品質を計測する映像品質計測部と、を備えていることを特徴とするサーバ装置。
前記パケットの受信タイミングを受信応答に格納して前記サーバ装置に送出する送出部と、を備えていることを特徴とする携帯端末。
付記5に記載の携帯端末と、を備えていることを特徴とする映像品質計測システム。
前記圧縮エンコードによる出力信号をパケットに格納するとともに前記パケット転送装置を介して前記携帯端末に送出する工程と、
前記圧縮エンコードへの入力信号、前記圧縮エンコードによる出力信号をデコードした信号、前記パケットの送出タイミング、および、前記携帯端末による前記パケットの受信タイミングを参照して、映像品質を計測する工程と、を含むことを特徴とする映像品質計測方法。
前記圧縮エンコードによる出力信号をパケットに格納するとともにモバイルパケットネットワーク上のパケット転送装置を介して前記携帯端末に送出する処理と、
前記圧縮エンコードへの入力信号、前記圧縮エンコードによる出力信号をデコードした信号、前記パケットの送出タイミング、および、前記携帯端末による前記パケットの受信タイミングを参照して、映像品質を計測する処理と、前記パケット転送装置を介して前記携帯端末と接続されたコンピュータに実行させることを特徴とするプログラム。
76、176 パケット送信部
82、182 映像品質計測部
86、186 圧縮エンコード部
100 ウェブサーバ
150 モバイルパケットネットワーク
170、670 携帯端末
173 制御信号送受信部
177 パケット受信部
180 画像デコード部
181 画面キャプチャ部
183 デコード部
185 蓄積部
190 xGSN装置
193、194 基地局
195、196 RNC装置
200 応答時間算出部
201 画像品質算出部
202 映像品質算出部
211_1~211_N 仮想クライアント部
304 S/P-GW装置
305、306 e-NodeB装置
350 モバイルLTE/EPCネットワーク
Claims (14)
- モバイルネットワーク上のパケット転送装置を介して携帯端末と接続されたサーバ装置であって、
前記携帯端末からの指示に応じてインターネット上のウェブサーバからダウンロードした画面情報または画像情報を圧縮してエンコードする圧縮エンコード部と、
前記圧縮エンコード部からの出力信号をパケットに格納するとともに前記パケット転送装置を介して前記携帯端末に送出するパケット送信部と、
前記圧縮エンコード部への入力信号、前記圧縮エンコード部からの出力信号をデコードした信号、前記パケットの送出タイミング、および、前記携帯端末による前記パケットの受信タイミングを参照して、映像品質を計測する映像品質計測部と、を備えていることを特徴とするサーバ装置。 - 前記映像品質計測部は、前記圧縮エンコード部への入力信号と前記圧縮エンコード部からの出力信号をデコードした信号に基づいてPSNR(Picture Signal to Noise Ratio)を算出するとともに、前記パケットの送出タイミングと前記携帯端末による前記パケットの受信タイミングに基づいて応答時間を算出し、算出したPSNRおよび応答時間から前記映像品質を求めることを特徴とする、請求項1に記載のサーバ装置。
- 前記映像品質計測部は、前記PSNRおよび前記応答時間のそれぞれに重み付けをしつつ足し合わせることにより、前記映像品質を求めることを特徴とする、請求項2に記載のサーバ装置。
- 前記圧縮エンコード部への入力信号、前記圧縮エンコード部からの出力信号または前記圧縮エンコード部からの出力信号をデコードした信号、前記パケットの送出タイミング、および、前記携帯端末による前記パケットの受信タイミングを蓄積する蓄積部をさらに備えていることを特徴とする、請求項1ないし3のいずれか1項に記載のサーバ装置。
- 請求項1ないし4のいずれか1項に記載のサーバ装置から前記モバイルネットワークを介して前記パケットを受信し、前記パケットに格納された前記圧縮エンコード部からの出力信号をデコーダにより復号して画面を表示する再生部と、
前記パケットの受信タイミングを受信応答に格納して前記サーバ装置に送出する送出部と、を備えていることを特徴とする携帯端末。 - 請求項1ないし4のいずれか1項に記載のサーバ装置と、
請求項5に記載の携帯端末と、を備えていることを特徴とする映像品質計測システム。 - 前記モバイルネットワークは、モバイルパケットネットワーク、または、モバイルLTE/EPCネットワークであることを特徴とする、請求項6に記載の映像品質計測システム。
- 前記パケット転送装置は、xGSN装置、または、S/P-GW装置であることを特徴とする、請求項7に記載の映像品質計測システム。
- モバイルネットワーク上のパケット転送装置を介して携帯端末と接続されたサーバ装置が、該携帯端末からの指示に応じてインターネット上のウェブサーバからダウンロードした画面情報または画像情報を圧縮してエンコードする工程と、
前記圧縮エンコードによる出力信号をパケットに格納するとともに前記パケット転送装置を介して前記携帯端末に送出する工程と、
前記圧縮エンコードへの入力信号、前記圧縮エンコードによる出力信号をデコードした信号、前記パケットの送出タイミング、および、前記携帯端末による前記パケットの受信タイミングを参照して、映像品質を計測する工程と、を含むことを特徴とする映像品質計測方法。 - 前記圧縮エンコードへの入力信号と前記圧縮エンコードによる出力信号をデコードした信号に基づいてPSNR(Picture Signal to Noise Ratio)を算出するとともに、前記パケットの送出タイミングと前記携帯端末による前記パケットの受信タイミングに基づいて応答時間を算出し、算出したPSNRおよび応答時間から前記映像品質を求めることを特徴とする、請求項9に記載の映像品質計測方法。
- 前記PSNRおよび前記応答時間のそれぞれに重み付けをしつつ足し合わせることにより、前記映像品質を求めることを特徴とする、請求項10に記載の映像品質計測方法。
- 携帯端末からの指示に応じてインターネット上のウェブサーバからダウンロードした画面情報または画像情報を圧縮してエンコードする処理と、
前記圧縮エンコードによる出力信号をパケットに格納するとともにモバイルパケットネットワーク上のパケット転送装置を介して前記携帯端末に送出する処理と、
前記圧縮エンコードへの入力信号、前記圧縮エンコードによる出力信号をデコードした信号、前記パケットの送出タイミング、および、前記携帯端末による前記パケットの受信タイミングを参照して、映像品質を計測する処理と、前記パケット転送装置を介して前記携帯端末と接続されたコンピュータに実行させることを特徴とするプログラム。 - 前記圧縮エンコードへの入力信号と前記圧縮エンコードによる出力信号をデコードした信号に基づいてPSNR(Picture Signal to Noise Ratio)を算出するとともに、前記パケットの送出タイミングと前記携帯端末による前記パケットの受信タイミングに基づいて応答時間を算出し、算出したPSNRおよび応答時間から前記映像品質を求める処理を、前記コンピュータに実行させることを特徴とする、請求項12に記載のプログラム。
- 前記PSNRおよび前記応答時間のそれぞれに重み付けをしつつ足し合わせることにより、前記映像品質を求める処理を、前記コンピュータに実行させることを特徴とする、請求項13に記載のプログラム。
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