CN102316363A - Method and devices for measuring video end-to-end delay by non-intrusive double-ended collection - Google Patents
Method and devices for measuring video end-to-end delay by non-intrusive double-ended collection Download PDFInfo
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Abstract
The invention provides a method and devices for measuring a video end-to-end delay by non-intrusive double-ended collection. The method comprises the following steps that: a main measurement device is placed locally and an auxiliary measurement device is placed at a far end, wherein the two devices are connected by a network and a private line; a camera of the auxiliary measurement device is righty opposite to a remote display at the far end; a time difference delta TVL is measured according to a video measurement signal emitted by a local signal generator and a time difference delta TVR is measured by a video measurement signal emitted a far-end signal generator; and according to the delta TVL and the delta TVR, the main measurement device calculates an end-to-end delay that is expressed as follows: delta V is equal to a result by dividing a sum by 2, wherein a sum is obtained by pulsing delta TVL with delta TVR. In addition, the main measurement device provided in the invention comprises: a video test signal generator, a video multipath collection module, a network receiving module, a video time delay measurement unit and a data storage and display unit. And the auxiliary measurement device provided in the invention comprises: a video test signal generator, a video multipath collection module, and a network sending module.
Description
Technical field
The present invention relates to the propagation of computer media information, QoS qos measurement, particularly relate to end-to-end delay measuring method of video and device that a kind of non-intervention type both-end is gathered.
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 end-to-end delay measuring method of video and the device that provide the non-intervention type both-end to gather.
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 the video end-to-end time delay that non-intervention both-end of the present invention is gathered is measured comprises the steps:
(1) testing apparatus is made up of the main measurement mechanism of this locality and the aided measurement device of far-end jointly, and main measurement mechanism is gathered the local test signal, and aided measurement device is gathered the remote test signal and passed back to main measurement mechanism through network or special line.
(2) local video test signal generator sends video test signals, and this signal is imported the video capture device (as: video camera) of local terminal of video capture device (as: video camera) and the system under test (SUT) of this landlord testing apparatus simultaneously.
(3) video test signals that gets into system under test (SUT) local terminal video camera arrives the display screen of system under test (SUT) distance terminal through handling and Network Transmission.The test signal that gets into this landlord testing apparatus is then directly read by measurement mechanism, and the time T of video test signals received in main testing apparatus record
VL1
(4) camera of far-end aided measurement device is gathered the distal displayed screen and is gone up the test video signal of playing over against system under test (SUT) distal displayed screen, passes this landlord measurement mechanism back through links such as encoding compression, Network Transmission.
(5) local main measurement mechanism receives the test signal that the far-end aided measurement device is passed back, and the time T of this signal received in record
VL2, the decoding back submits to signal processing unit to carry out analytical calculation.
(6) local main measurement mechanism calculates time difference between the two according to the time that obtains in step (3) and the step (5), is designated as Δ T
VL=T
VL2-T
VL1
(7) measuring signal generator of far-end sends video test signals, and this signal is simultaneously by the reception that video camera is gathered of the distance terminal of the video camera of the aided measurement device of far-end and system under test (SUT).
(8) the video test signals process that gets into the video camera of system under test (SUT) distance terminal is handled and Network Transmission; Arrive the display screen of system under test (SUT) local terminal; After local main measurement mechanism is gathered; The entering signal processing unit is analyzed and is calculated, and the time T of this video test signals received in main measurement mechanism record
VR1.
(9) video test signals of entering far-end aided measurement device camera is transferred to this landlord measurement mechanism through network or special line, is submitted to signal processing unit then and carries out analytical calculation, and the time T of this video test signals received in main measurement mechanism record
VR2.
(10) signal processing unit of local main measurement mechanism calculates time difference between the two according to two times of step (8) and step (9) record, is designated as Δ T
VR=T
VR1-T
VR2
(11) signal processing unit of main measurement mechanism is according to two time difference Δ T that successively obtain
VLWith Δ T
VR, the video end-to-end time delay Δ of calculating system under test (SUT)
V=(Δ T
VL+ Δ T
VR)/2.
Measurement mechanism of the present invention comprises main measurement mechanism and aided measurement device, realizes communication through network or special line between the two.
Aided measurement device of the present invention comprises following assembly:
(1) flying-spot video generator 101, and periodicity or disposable generation have the video test signals of specific format and pattern, and are responsible for playing back video test signals.
(2) vision signal multi pass acquisition module 102; Provide two-way above video acquisition passage; Connect video capture devices such as camera, video camera through interfaces such as USB, video frequency collection cards, gather the video test signals of local video test signals and process system under test (SUT).
(3) the network sending module 103, will collect data test signal and send main measurement mechanism to through network.
Main measurement mechanism of the present invention comprises following assembly:
(1) flying-spot video generator 201, and periodicity or disposable generation have the vision signal of specific format and pattern, and are responsible for playing back vision signal.
(2) vision signal multi pass acquisition module 202; Provide two-way above video acquisition passage; Connect video capture devices such as camera, video camera through interfaces such as USB, video frequency collection cards, gather the video test signals of local video test signals and process system under test (SUT).The video capture device and the interface that are adopted in the specification of this video capture device and interface and the auxiliary test unit vision signal multi pass acquisition module are identical.
(3) the network receiver module 203, receive the data that aided measurement device sends from network.
(4) the video time-delay measuring unit 204, from multi-channel video acquisition module, network receiver module input two-path video signal, the time delay between the two paths of signals added up and calculated.
(5) storage and display unit 205, the receiver, video delay data outputs results on the memory device and display device of appointment.
The video end-to-end time delay method of measurement and the measurement mechanism of the single-ended collection of non-intervention type of the present invention 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 type, 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, in full accord on type and content with the decide time delay assessed when impression receives and evaluates and tests of user.
(3) measurement mechanism of the inventive method is formed with the aided measurement device that is positioned at far-end by being positioned at local main measurement mechanism.Be connected through network between auxiliary equipment and the main equipment, form a video test signals transmission path.This path is with the video Data Transmission path of system under test (SUT); Constitute the transmission loop of test signal; Can solve the occasion of being inconvenient to provide the test signal loop of system under test (SUT) own; Such as: the terminal of system under test (SUT) far-end, display screen and video camera be fix in position all, is difficult to each other over against forming the vision signal loop.
(4) utilize method of the present invention, the measuring signal generator of local side measuring signal generator and far-end produces test signal separately respectively, and each test signal divides two-way to get into main measurement mechanism, obtains a time difference, is respectively Δ T
VRWith Δ T
VL, The ultimate results is Δ T
VRWith Δ T
VLDivided by 2, just cancel out each other the propagation delay time between main measurement mechanism and the aided measurement device after the addition.And the result of both additions 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 this asymmetry, the result after average can reflect the actual performance of end-to-end time delay more accurately.
(5) the inventive method can make measuring signal generator continue to produce characteristic signal in a period of time; Utilize measurement mechanism to continue test; Obtain a series of delay data; 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
When Fig. 1 is the application local test signal generator of the present invention's one instance, video end-to-end time delay test philosophy sketch map;
When Fig. 2 is the application remote test signal generator of the present invention's one instance, video end-to-end time delay test philosophy sketch map;
Fig. 3 is the aided measurement device internal structure sketch map of the present invention's one instance;
Fig. 4 is the main 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, Fig. 2 have provided the video end-to-end time delay testing principle sketch map that the non-intervention type double-end signal is gathered.
Like Fig. 1, video end-to-end time delay method of measurement of the present invention comprises:
Step 1 is placed a main measurement mechanism in this locality, place an aided measurement device at far-end, connects through network between two equipment and communicates by letter; Main measurement mechanism is gathered local signal, and aided measurement device is gathered remote signaling and passed the main measurement mechanism to this locality back through network.
(1) camera of the main measurement mechanism in this step 1 guarantees accurately to gather the video test signals that the local terminal display screen sends over against the display screen of system under test (SUT) local terminal.
(2) camera of the aided measurement device in this step 1 guarantees accurately to gather the video test signals that the distance terminal display screen sends over against the display screen of system under test (SUT) distance terminal.
Step 2, local video test signal generator sends the test video signal, and this signal is imported the video camera (shown in the position A among Fig. 1) of the local terminal of system under test (SUT) and the video camera (shown in the position B among Fig. 1) of main measurement mechanism simultaneously.
(1) video test signals in this step 2 gets into system under test (SUT) local terminal video camera, through handling and Network Transmission, arrives the display screen (shown in the position C among Fig. 1) of system under test (SUT) distance terminal through signal.
(2) the then direct measured device of signal that also gets into simultaneously main testing apparatus video capture device of the video test signals in this step 2 reads (shown in the position B among Fig. 1).
Step 3, the video test signals that the distal displayed screen is play through the camera of far-end aided measurement device, gets into far-end aided measurement device (shown in the position D among Fig. 1).
(1) video test signals of entering far-end aided measurement device in this step 3 through after the encoding compression, is passed this landlord measurement mechanism back through Network Transmission, successively position E among approach Fig. 1 and position F.
Step 4, local main measurement mechanism receives the test video that the far-end aided measurement device is passed back, and the decoding back submits to signal processing unit to carry out analytical calculation.
Step 5, local main measurement mechanism is discerned two kinds of test video signals successively receiving, calculates time difference between the two, is designated as Δ T
VL.
The time difference Δ T that calculates in this step 5
VLMainly be two parts time delay with, the i.e. One Way Delay Δ T of A → C
ACAnd the One Way Delay Δ T of D → E → F
DEF, Δ T is promptly arranged
VL=Δ T
AC+ Δ T
DEF.
Step 6, the far-end video test signal generator among Fig. 2 sends video test signals, and this signal is imported the video camera (shown in the position C of Fig. 2) of the distance terminal of system under test (SUT) and the video camera (shown in the position D of Fig. 2) of far-end aided measurement device simultaneously.
Step 7; The signal that gets into system under test (SUT) distance terminal video camera is through handling and Network Transmission; Arrive the display (shown in the position A of Fig. 2) of local terminal, after local main measurement mechanism collection (shown in the position B of Fig. 2), the entering signal processing unit is analyzed and is calculated.
Step 8, the video test signals that gets into far-end aided measurement device camera arrives this landlord measurement mechanism through Network Transmission, and successively position E among approach Fig. 2 and position F are submitted to signal processing unit then and are carried out analytical calculation.
Step 9, the signal processing unit of local main measurement mechanism is discerned the test video signal of successively receiving from the remote signaling generator, calculates time difference between the two, is designated as Δ T
VR
The time difference Δ T that calculates in this step 9
VRMainly be the poor of two parts time delay, promptly the one-way latency of C → A and D → E → F one-way latency is poor, is designated as Δ T respectively
CAWith Δ T
DEF, thereby Δ T is arranged
VR=Δ T
CA-Δ T
DEF.
Step 10, the signal processing unit of main measurement mechanism is according to two time difference Δ T of step (5) and the acquisition of (9) priority
VLWith Δ T
VR, the end-to-end time delay Δ of calculating system under test (SUT)
V=(Δ T
VL+ Δ T
VA)/2.
Δ T in this step 10
VL=Δ T
AC+ Δ T
DEF, Δ T
VR=Δ T
CA-Δ T
DEF, both add up to:
Δ
V＝(ΔT
VL+ΔT
VR)/2
＝[(ΔT
AC+ΔT
DEF)+(ΔT
CA-ΔT
DEF)]/2
＝(ΔT
AC+ΔT
CA)/2
The result who obtains is the mean value of A → C time delay and C → A time delay.
Embodiment 2, and Fig. 3 has provided the organigram of aided measurement device
Like Fig. 3, the aided measurement device of audio frequency and video end-to-end time delay of the present invention comprises:
Assembly 1, video test signal generator 101 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 102 is responsible for the multi-channel video test signal that input separates, and with the vision signal fan-in network sending module that collects.
Assembly 3, network sending module 103 is responsible for the measuring-signal that collects is sent to main measurement mechanism through network.
Embodiment 3, and Fig. 4 has provided the organigram of the main measurement mechanism of video end-to-end time delay
Like Fig. 4, the main measurement mechanism of audio frequency and video end-to-end time delay of the present invention comprises:
Assembly 1, video test signal generator 201 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 202 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, network receiver module 203 is responsible for receiving the measuring-signal that the far-end aided measurement device sends through network.
Assembly 4, video time-delay measuring unit 204 is responsible for the vision signal of input is analyzed, discerns, compared and measures, and concrete steps comprise:
Step 1; Multi-channel 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 from mixed signal, identify video test signals exactly, and time of arriving of record acquisition.
Step 2, poor computing time to the measuring-signal that local signal generator sends, be designated as Δ T
VL, Δ T wherein
VL=Δ T
AC+ Δ T
DEF, Δ T
ACBe the One Way Delay of A → C, Δ T
DEFOne Way Delay for D → E → F.
Step 3, poor computing time to the measuring-signal that the remote signaling generator sends, be designated as Δ T
VR, Δ T wherein
VR=Δ T
CA-Δ T
DEF, Δ T
CABe the one-way latency of C → A, Δ T
DEFBe D → E → F one-way latency.
Step 4, the end-to-end time delay Δ T of calculating system under test (SUT)
V=(Δ T
VL+ Δ T
VR)/2 are submitted to storage and display unit.
Assembly 5, storage and display unit 205, the receiver, video delay data outputs results on the memory device and display device of appointment
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 (5)
1. the non-intervention type both-end video end-to-end time delay method of measurement of gathering is characterized in that:
(1) the local test signal generator produces video test signals, respectively by main testing apparatus and system under test (SUT) collection; Main testing apparatus record acquisition is to the time of this video test signals; System under test (SUT) is delivered to far-end with test signal;
(2) auxiliary test unit receives the video test signals through system under test (SUT), and the video test signals that receives is sent back to main testing apparatus, and is write down the time of receiving this video test signals by main testing apparatus;
(3) confirm the time difference according to two times of step (1), step (2) record;
(4) the remote test signal generator produces video test signals, is gathered by auxiliary test unit and system under test (SUT) far-end video capture device respectively simultaneously, and auxiliary test unit passes the video test signals of receiving to main testing apparatus back; The system under test (SUT) far-end is passed the test signal of gathering back local side and is play;
(5) main testing apparatus receives the video test signals through system under test (SUT), the time that this video test signals received in record;
(6) main testing apparatus receives the video test signals that auxiliary test unit is sent, the time that this video test signals received in record;
Confirm the time difference when (7) main testing apparatus is according to two of step (5), step (6) record;
(8) main testing apparatus is confirmed the video end-to-end time delay according to step (3), two definite times of step (7).
2. the video end-to-end time delay measurement mechanism of non-intervention type double-end signal is characterized in that, comprising: main measurement mechanism and aided measurement device, realize communication through network or special line between the two.
3. according to the audio frequency and video end-to-end time delay measurement mechanism of the said non-intervention type double-end signal of claim 2, it is characterized in that said aided measurement device comprises:
Flying-spot video generator (101) is used for periodically or disposable generation has the video test signals of specific format and pattern, and this test signal can be discerned for testing apparatus;
Multi-channel video acquisition module (102) is gathered video test signals that the far-end flying-spot video generator produces, that play by the system under test (SUT) distance terminal respectively;
Network sending module (103) is used for sending the test signal that multi-channel video acquisition module (102) collects to main measurement mechanism.
4. according to the video end-to-end time delay measurement mechanism of the said non-intervention type double-end signal of claim 2, it is characterized in that said main measurement mechanism comprises:
Flying-spot video generator (201) is used for periodically or disposable generation has the video test signals of specific format and pattern, and test signal is sent to local video harvester and system under test (SUT) local terminal;
Multi-channel video acquisition module (202) is gathered video test signals that the local video signal generator produces, that play by the system under test (SUT) local terminal respectively;
Network receiver module (203) is used to receive the test signal that aided measurement device sends;
Video time-delay measuring unit (204) is used for the vision signal that receiver, video acquisition module (202) and network receiver module (203) are imported, and confirms time delay between the two.
5. according to the video end-to-end time delay measurement mechanism of the said non-intervention type double-end signal of claim 4; It is characterized in that said main measurement mechanism also comprises storage and display unit (205), be used to store the time delay of video end to end that display video time-delay measuring unit (204) is confirmed.
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| CN102316363B (en) | 2014-04-02 |
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