CN102316357A - Non-intrusive single-ended acquired video end-to-end time delay measuring method and device - Google Patents
Non-intrusive single-ended acquired video end-to-end time delay measuring method and device Download PDFInfo
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- CN102316357A CN102316357A CN201110267937A CN201110267937A CN102316357A CN 102316357 A CN102316357 A CN 102316357A CN 201110267937 A CN201110267937 A CN 201110267937A CN 201110267937 A CN201110267937 A CN 201110267937A CN 102316357 A CN102316357 A CN 102316357A
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Abstract
The invention provides a non-intrusive single-ended acquired video end-to-end time delay measuring method and a device. The video end-to-end time delay measuring method comprises the step of aligning a far-end display to a far-end camera to form a video circuit. One path of video measurement signal sent by a signal generator directly enters a measuring device, and the other path of video measurement signal enters a local terminal of a system to be measured and returns after passing by remote terminal audio and video circuits. The time delay inequality of the two paths of signals is divided by 2 to obtain the measurement value of the video end-to-end time delay. The measuring device disclosed by the invention comprises a video test signal generator, a video multi-path acquisition module, a video time delay measuring unit and a data storage and display unit. The method and the device disclosed by the invention are in a non-intrusive type. Compared with the prior art, the invention is not affected by the internal implementation of the system to be measured, comprehensively includes the time delay of all the links, and has the characteristics of accuracy and convenience.
Description
Technical field
The present invention relates to the propagation of computer media information, QoS qos measurement, particularly relate to the video end-to-end time delay method of measurement and the device of the single-ended collection of non-intervention type.
Background technology
Use fast development and popularize along with based on network multimedia service, systems such as network audio-video program request, network audio-video meeting are popular rapidly.The user has proposed increasingly high requirement to the professional QoS service quality of network multimedia.How can be fast, convenient, accurately the key qos parameter of candidate products is made assessment, be the key of successfully selecting best product.
Simultaneously, research and development and produce the professional manufacturer with system of network multimedia also need a kind of device can be quickly and easily the key parameter of the network multimedia product of own production to be measured, so that in product development process, measure key parameter, and improvement at any time.
End-to-end time delay is one of critical performance parameters of multimedia service, and it directly influences the assessment of QoS and user experience.End-to-end time delay generally includes and gathers time delay, coding time delay, network transfer delay, decoding time delay, plays time delay etc.
The method of existing detection end-to-end time delay roughly can be divided into two big types: one type belongs to insertion type; Promptly through inject the measuring-signal of characteristic at an end of the signal transmission path of system under test (SUT); Perhaps additional measurement data on the original signal data of system under test (SUT); Extract the time that measurement data and recorder are arrived at the other end then, relatively the difference of two times is obtained the time delay size.
The main feature of this type insertion type method is need get involved in the signal transmission path of system under test (SUT), to wherein adding data or therefrom extract measurement data, has being connected of physical circuit between measurement mechanism and the equipment under test.
The main difficult point of this type insertion type method of measurement is:
At first, transmit because measurement data depends on the Frame or the packet of system under test (SUT) usually, middle inevitable through links such as encoding compression, encapsulation, decapsulation, decodings, measurement data may lose or damage in encoding compression and decompression procedure;
Secondly, because data format, encapsulation format, encoding compression and the decoding algorithm of system under test (SUT) may not disclose, the tester will design the metering system and the measuring-signal that match can compare difficulty.
The 3rd, the insertion type method of measurement usually requires serial connection tap or tandem head on the signal data path of system under test (SUT), and is for the system under test (SUT) that has installed, cumbersome usually or be not allowed to.
In addition, the tool software that the insertion type method of measurement that has need operating measurement be used on the terminal of system under test (SUT) carries out timing through tool software.This mode may influence the normal operation at system under test (SUT) terminal itself, can only use in exploitation and debug phase at most, and be difficult to be used in the system of commercialization.
Another kind of method of testing is a non-intervention type, does not have the physics contact between system under test (SUT) and the measurement mechanism, is regarded as flight data recorder to system under test (SUT), and test signal mainly is to get into system under test (SUT) through the sound and optic signal mode, and exports with sound, light mode.Measurement mechanism is through contrast and analyze input, the output signal obtains the time delay size.The advantage of these class methods is the actual motions that stay out of system under test (SUT), with system under test (SUT) concrete realize irrelevant, so have extensive applicability.Such as the subjective sensation and the sense of hearing through human eye, people's ear, assessing end-to-end time delay is exactly these class methods.
Though utilize human eye, people's ear to come subjective evaluation and test very directly perceived, exist under the more approaching situation of the end-to-end time delay parameter of very big error, especially two kinds of systems under test (SUT), be difficult to make science and judge accurately, cause measurement result to lack persuasion.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art, the video end-to-end time delay method of measurement and the device of non-intervention type single-ended signal is provided.
The present invention adopts the strategy of non-intervention, is used as flight data recorder to system under test (SUT), to system under test (SUT) end to end the video time delay designed the measuring technique scheme.
The technical scheme that video end-to-end time delay of the present invention is measured comprises the steps:
(1) with the video capture device video camera of system under test (SUT) over against the far-end screen, constitute the vision signal loop;
(2) utilize video test signal generator to produce at local side and preestablish frequency and the video test signals that preestablishes pattern, this test signal gets into the video signal collection apparatus of measurement mechanism and system under test (SUT) simultaneously respectively.
(3) after the signal of entering measurement mechanism is gathered, submit to signal processing module and detect, and note the T time of advent of this video test signals
V1
(4) after the video test signals that gets into system under test (SUT) is gathered,, come out at the far-end screen display of system under test (SUT) through links such as encoding compression, Network Transmission, decodings.
(5) after the video test signals of far-end screen display is gathered by Remote Camera,, pass local side again back, and come out at local screen display through links such as encoding compression, Network Transmission, decodings.
(6) after the video test signals of the local screen of system under test (SUT) is gathered by the second road video signal collection apparatus of measurement mechanism, the signal processing module of input measurement device.
(7) signal processing module of measurement mechanism detects the second tunnel video test signals of step (6) collection, and notes the T time of advent of this video test signals
V2
(8) video signal processing module of measurement mechanism is calculated respectively by the time delay (T between the two-path video test signal of signal generator and system under test (SUT) screen display according to test record
V2-T
V1), this time delay is represented the video loop time delay between this locality and the far-end, promptly comprises forward-propagating time delay and backpropagation time delay.Video signal processing module this loop time delay divided by 2 test results, i.e. Δ T as the video end-to-end time delay
V=(T
V2-T
V1)/2.
The video end-to-end time delay measurement mechanism of the single-ended collection of non-intervention of the present invention comprises following assembly:
Assembly 1, video test signal generator 100 is responsible for producing video test signals.This signal can be analyzed and discerned by video latency measurement device.
Assembly 2, multi-channel video acquisition module 200 is responsible for the multi-channel video test signal that input separates, and with the vision signal input video time-delay measuring unit that collects.
Assembly 3, video time-delay measuring unit 300 is responsible for the vision signal of input is analyzed, discerns, compared and measures.
Assembly 4, storage and display unit 400 are used to store the video end-to-end time delay that shows that said video time-delay measuring unit 300 is confirmed.
The video end-to-end time delay method of measurement and the measurement mechanism of non-intervention type single-ended signal of the present invention collection have the following advantages:
(1) the inventive method is a non-intervention type, is regarded as flight data recorder to system under test (SUT), and method of testing does not receive the influence of factors such as the internal structure, network type, data format, code decode algorithm, function implementation of system under test (SUT).
(2) the video end-to-end time delay measured of the inventive method, comprised from video acquisition until video playback in the time delay summation of interior all links, the time delay that institute experiences and assesses when doing subjective evaluation and test with the user is in full accord on type and content.
(3) transmission path of the test signal of the inventive method in system under test (SUT) forms a loop, both comprised the transmission path from this locality to the far-end, also comprised the transmission path from the far-end to this locality.Even there is the whereabouts path in transmission network and returns asymmetric to the performance in path; After also can postponing through counter circuit; Obtain a comprehensive mean value divided by 2; Eliminate the influence of the performance asymmetry of this network path, the result after average can reflect the actual performance of end-to-end time delay more accurately.
(4) the inventive method is utilized the video capture device of two same specifications in the end-to-end delayed test of video, and adopts same-interface.Even there is intrinsic collection time delay in video capture device, then this intrinsic collection time delay also can be reflected in T simultaneously
V2And T
V1In, can pass through Δ
V=(T
V2-T
V1Subtraction in)/2 makes the collection time delay of two video capture devices cancel out each other, thereby eliminates the influence of the intrinsic delay of video capture device to test result itself.
(5) the inventive method at the appointed time makes measuring signal generator continue to produce characteristic signal in the section; Utilize measurement mechanism to continue test; Obtain a series of delay data; And therefrom analyze statistical natures such as maximum delay, minimal time delay and average delay, can more comprehensively reflect the performance change under the heterogeneous networks load condition of end-to-end time delay.
Description of drawings
Fig. 1 is the video end-to-end time delay test philosophy sketch map of the present invention's one instance;
Fig. 2 is the measurement mechanism internal structure sketch map of the present invention's one instance.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done to specify further, but execution mode of the present invention is not limited thereto.
Embodiment 1, and Fig. 1 has provided video end-to-end time delay testing principle sketch map.
Like Fig. 1, video end-to-end time delay method of measurement of the present invention comprises:
Step 1, video test signal generator sends video test signals, the video camera of the video camera of this signal while input measurement device and the local terminal of system under test (SUT).
(1) screen of the video test signal generator in this step 1 need guarantee that the video test signals that this generator produces can receive by measured effectively device over against the video camera of measurement mechanism.
(2) screen of the video test signal generator in this step 1 need guarantee that the video test signals that this generator produces can get into equipment under test effectively over against the local video camera at system under test (SUT).
(3) video test signals in this step 1 can be the video pulse of specific pattern, and the pattern of this video pulse and pattern must be discerned by measured device, and writes down its initial moment and the peak value moment.For example, video test signals can be the pattern color sudden change from the pure color to the colour, and this jump signal forms a data pulse stream in video data stream after gathering.But the form of the video test signals that the present invention adopted is not limited to above-mentioned form of giving an example.
Step 2, the signal that gets into the local terminal video camera arrives the display of distance terminal through handling and Network Transmission.The then direct measured device of signal that gets into local video camera reads.
(1) video test signals in this step 2 gets into system under test (SUT) from local video camera, and through a series of links, finally the distance terminal display at system under test (SUT) broadcasts.Such as, this video test signals in system under test (SUT) the link of process include but not limited to: video acquisition, encoding compression, encapsulation, network transmission, Network Transmission, network reception, decapsulation, decoding, broadcast etc.
(2) while of the video test signals in this step 2 is by the camera acquisition of measurement mechanism.The local video camera model of the video camera model of measurement mechanism and system under test (SUT) is irrelevant.
(3) video test signals that arrives of the camera acquisition of the measurement mechanism in this step 2 is finally submitted to signal processing unit analysis, and is write down its time of advent.
Step 3, the distance terminal video camera of system under test (SUT) receive the test video of distal displayed device over against distal displayed device screen, through after the encoding and decoding, pass the local terminal back through Network Transmission.
(1) video camera of the system under test (SUT) distance terminal in this step 3 need guarantee that the test video signal that the distal displayed device sends can effectively He reliably be received by the video camera of distance terminal over against the distal displayed device.
(2) the test video signal received of the system under test (SUT) distance terminal display in this step 3 gets into system under test (SUT) once more; Along passing the local terminal back in the other direction, the link of passage in transit includes but not limited to: video acquisition, encoding compression, encapsulation, network transmission, Network Transmission, network reception, decoding, broadcast etc.
Step 4, local terminal receive the test video that distance terminal is passed back, play-over after the decoding, and the local video signal collecting device of measured device receive.
(1) the test video signal in this step 4 is passed the local terminal of system under test (SUT) back, and the decoding back is the display broadcast in the local terminal.
(2) the system under test (SUT) local terminal indicator screen in this step 4 need guarantee that the video test signals that local display is play can measured effectively reliably device collection over against another road video camera of measurement mechanism.
(3) video capture device of the video capture device of the measurement mechanism in this step 4 and the measurement mechanism in interface and the step 2 and interface are the equipment of same model and specification, cancel out each other with the inherent delay that guarantees the two-path video acquisition channel.
(4) after the video capture device of the measurement mechanism in this step 4 collects the second tunnel video test signals, submit to signal processing unit analysis.
Step 5, measurement mechanism is discerned the test video signal of successively receiving, calculates the time difference of receiving for twice between the data test signal of looking, and divided by 2, as the video end-to-end time delay of system under test (SUT).
(1) measurement mechanism in this step 5 is discerned the video test signals of successively receiving.Video test signals through the system under test (SUT) transmission; Compare with the video test signals that directly receives from signal generator; May have distortion to a certain degree, measurement mechanism need correctly identify video test signals from all signals that receive, and writes down its time of advent.
(2) measurement mechanism in this step 5 calculates time difference between the two according to the time of advent of the video test signals of twice arrival successively.This time difference comprises from this locality to the far-end and returns local time delay from far-end, is equivalent to the end-to-end time delay of twice, therefore will obtain the mean value of end-to-end time delay divided by 2.
In the above-mentioned steps 1～step 5; Measuring signal generator can periodically generate video test signals as required, and test macro periodically repeats step 1～step 5; Obtain a series of time delay records; Therefrom carry out statistical analysis, obtain series of parameters such as maximum delay, minimal time delay, average delay and time delay variance, and submit to memory device to data set respectively and demonstration is preserved and printed to display device.
Embodiment 2, and Fig. 2 has provided the organigram of video end-to-end time delay measurement mechanism
Like Fig. 2, video end-to-end time delay measurement mechanism of the present invention comprises:
Assembly 1, video test signal generator is responsible for producing video test signals.This signal can be analyzed and discerned by video latency measurement device.
Assembly 2, the multi-channel video acquisition module is responsible for the multi-channel video test signal that input separates, and with the vision signal input video time-delay measuring unit that collects.
Assembly 3, the video time-delay measuring unit is responsible for the vision signal of input is analyzed, discerns, compared and measures, and concrete steps comprise:
Step 1; Two-path video test signal to the input of multi-channel video acquisition module is analyzed; Because the video test signals after postponing unavoidably has noise jamming, need therefrom to recognize the pairing time point of starting point, peak value of video test signals exactly, and note.
Step 2 is thought comparison with the some time of advent of the video test signals after the delay of noting with the some time of advent of the video test signals that directly is received from signal generator, calculates both differences, divided by 2, as the practical video end-to-end delay.
Step 3, the video end-to-end delay from step 2 obtains is submitted to storage and display unit.
Assembly 4, storage and display unit 400 are used to store the video end-to-end time delay that shows that said video time-delay measuring unit 300 is confirmed.
The foregoing description is a preferred implementation of the present invention; But execution mode of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (4)
1. the video end-to-end time delay method of measurement of the single-ended collection of non-intervention type is characterized in that:
(1) vision signal is transferred to the video capture device of testing apparatus, the local terminal of system under test (SUT) respectively simultaneously; Recorded video signal gets into the time of the video signal collection apparatus of testing apparatus;
The video signal transmission that (2) will get into the local terminal of system under test (SUT) is given the system under test (SUT) distance terminal;
(3) the system under test (SUT) distance terminal will be given the system under test (SUT) local terminal by the video signal transmission that step (2) obtains;
(4) the local video collecting device will be given by the video signal transmission that step (3) obtains in the system under test (SUT) local terminal, and recorded video signal arrives the time of local video collecting device through system under test (SUT);
(5) confirm the video end-to-end time delay according to the time of step (1), step (4) record.
2. the video end-to-end time delay measurement mechanism of non-intervention type single-ended signal is characterized in that comprising:
Flying-spot video generator (100); Be used for periodicity or disposable generation and have the video test signals of specific format and pattern; And video test signals is transferred to local video collecting device and system under test (SUT), the recording of video test signal is transferred to the time of local video collecting device;
Multi-channel video acquisition module (200) is used to gather the vision signal of local video collecting device and the vision signal of process system under test (SUT), the time of recorded video signal through arriving behind the system under test (SUT);
Video time-delay measuring unit (300); The vision signal that is used for receiver, video multi pass acquisition module (200) input is confirmed video end-to-end time delay to the time and the vision signal of local video collecting device through the time that arrives behind the system under test (SUT) according to video signal transmission.
3. the video end-to-end time delay measurement mechanism of non-intervention type single-ended signal is characterized in that: also comprise storage and display unit (400), be used for the video end-to-end time delay that storage shows that said video time-delay measuring unit (300) is confirmed.
4. measurement mechanism according to claim 2, the specification of video capture device and interface that it is characterized in that gathering in the described multi-channel video acquisition module (200) video data is identical.
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| CN103680368A (en) * | 2012-09-25 | 2014-03-26 | 波音公司 | Latency Measurement System And Method |
| CN103813161A (en) * | 2012-11-12 | 2014-05-21 | 腾讯科技（深圳）有限公司 | Delayed testing method and device |
| CN103826117A (en) * | 2014-01-17 | 2014-05-28 | 浙江大学 | Method of measuring end-to-end delay of mobile phone video communication application |
| CN104023229A (en) * | 2014-06-23 | 2014-09-03 | 公安部第三研究所 | Detection method and system for performances of non-contact type image system |
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| CN107801021A (en) * | 2017-10-27 | 2018-03-13 | 优酷网络技术（北京）有限公司 | Assess the methods, devices and systems of real-time video delay |
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| CN109728864A (en) * | 2018-12-26 | 2019-05-07 | 刘科宏 | System loss test method based on antenna measurement system |
| CN109728864B (en) * | 2018-12-26 | 2022-08-30 | 刘科宏 | System loss testing method based on antenna measuring system |
| CN110381309A (en) * | 2019-07-22 | 2019-10-25 | 王斌 | A kind of monitoring remote video image transmitting time-delay test method |
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Application publication date: 20120111 |