CN107753043B - A kind of methods of evaluation of the video cardton limiting value based on brain wave - Google Patents
A kind of methods of evaluation of the video cardton limiting value based on brain wave Download PDFInfo
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Abstract
A kind of methods of evaluation of the video cardton limiting value based on brain wave belongs to the variation detection field of the user emotion including dejected or is excited,It is characterized in that,First,Each qualified subject whole brain wave figures including each interim card period when extraction viewing,Mark out beginning and the end time of each interim card period,With this as the starting point,Marking out each interim card of cerebral cortex processing again stress signal time,Followed by,Reaching hand muscle neuron with reference to brain wave about needs 0.1 second brain science common knowledge,Estimate cerebral cortex send out stress brain wave the possibility period,According to first after last position α waves corresponding candidate interim card limiting value is found less than the principle of the wave i.e. first β waves of 50 μ V,Interim card being found out since each subject all interim card periods,End time plays whole interim card limit candidate values,Two of which time value the maximum is respectively the interim card limiting value for detecting user emotion variation,The present invention provides referential baseline parameter for evaluation interim card failure effect simultaneously.
Description
Technical field
The present invention relates to the detection fields of cognition emotional change, in particular to a kind of video card based on brain wave
The measurement method for limiting value of pausing is supervised mainly for the detection of user's negative emotions caused by video cardton phenomenon using brain wave
Survey means analyze beta band in quader, occipital lobe part, and occur significantly with statistical method verification characteristics signal
Time when sex differernce is about 350ms, i.e., when single interim card duration is more than 350ms, user will produce apparent negative emotions.
Emotional reactions to encounter Caton phenomenon when watching video based on brain wave monitoring user provide monitoring method.
Background technology
According to the second quarter in 2017 of Chinese broadband development alliance publication《China Internet Online Video experience assessment report
It accuses》It has been shown that, Online Video interim card rate that be averaged in China second quarter internet is that 0.09% (i.e. averagely 10 minutes videos of broadcasting go out
Existing 0.54 second interim card), average Playout delay for the first time is 895ms (average to go out in 1 second after i.e. user's click starts broadcasting
Existing video pictures).
Video definition, video initial buffer and video cardton have become user watch video when be concerned about the most because
Element, and the video tastes measurement standard built consensus in the industry.Wherein, user compares the tolerance interval of video definition
Greatly；The frequency of occurrences of video initial buffer during user watches video is relatively low, thus is influenced on the experience of user limited；And
Video cardton, then in entire video display process, especially in Online Video playing process, because of frequency of occurrences height and reason
Complexity, it is almost inevitable and common, maximum is influenced on the experience of user, causes user emotion reactions change also maximum.
Traditional interim card application when watching user video tastes, if Fidel Liberal were in web page quality in 2009
Evaluation is carried out using five point scales in the research of assessment and paper [1] is mentioned, mainly the subjectivity in the form of by interview or questionnaire
Based on evaluation method.This mode lacks the measurement of real-time experience during use, while Subjective Reports may relate to multiple hearts
Reason process also suffers from the influence of the factors such as social desirability and main examination effect.
Electrophysiological technique can more understand cognition emotional change of user during watching video tastes in depth.Skin
Electricity, electrocardio and brain electricity are user experience research field three classes electrophysiological indexs the most typical, relate generally to user experience process
The measurement of middle cognition and affective state：(1) in skin electricity index of correlation, skin conductivity level can effectively reflect that user uses production
Emotionality degree when product and cognitive effort degree；(2) in electrocardio index of correlation, heart rate is sensitive to the emotional experience of user,
And heart rate variability changes sensitivity to the mental load of user；(3) in brain electricity index of correlation, α waves and β waves are that user emotion becomes
Change the efficiency index with mental load.
Compared with skin electricity and electrocardio, the cognition emotional change that we understand during user experience that is measured as of brain electricity provides
More direct evidence.Brain wave (Electroencephalogram, EEG) is that some spontaneous rhythmic neuroelectricities are lived
Dynamic, frequency variation range can be divided into four wave bands, i.e. δ (1-3Hz), θ (4-7Hz), α between 1-30 times per second
(8-13Hz) and β (14-30Hz).Wherein, β wave frequency rates are 14~30Hz, and amplitude is 100~150 μ V, when nervous and feelings
There is this wave when exciting or excited in thread.This ingredient corresponds to the negative emotions of people.Meanwhile the β wave work(that top and occipital lobe generate
Rate is maximum.Therefore, it takes the power of beta band and top, occipital lobe channel to be analyzed and can determine that interim card causes rising for negative emotions
Begin the moment.
The measurement method for the video cardton limiting value based on brain wave that the present invention provides a kind of, mainly for video cardton
The detection of user's negative emotions caused by phenomenon, using brain wave monitoring means, quader, occipital lobe part to beta band into
Time when going and analyze, and significant difference occur with statistical method verification characteristics signal is about 350ms, i.e., when single interim card
When duration is more than 350ms, user will produce apparent negative emotions.It is encountered to be based on brain wave monitoring user when watching video
The emotional reactions of Caton phenomenon provide monitoring method.To when evaluation is as an interim card in Video service quality evaluation
When long problem, providing a user from the angle of macroscopic view can the receptible limit.
Invention content
Goal of the invention：It is an object of the present invention to be macroscopically that video quality service supplier provides from the angle of user
One estimation user can receptible Caton phenomenon limit duration, if the key for Caton phenomenon occur is the equipment in downstream
On, then also an evaluation method is provided for the elimination of failure.
It is a feature of the present invention that it is characterized in that, video cardton limiting value refers to since each interim card period or terminating
Moment plays top or occipital lobe area in cerebral cortex and generates first β wave this period when different subjects are in same interim card
Maximum value when in section, first β wave refer to that be transformed into mood dejected for α waves when interim card start time is by being absorbed in video
The first β wave generated when the β waves at moment, or refer to that the α waves waited for by calmness in interim card finish time subject are transformed into
The first β wave generated when the excited β waves of mood, first β wave further include in electromagnetic shielding laboratory once in a while by instrument
It the electromagnetic interference of generation or/and eyes neuron is sent to by the middle prefrontal area on cerebral cortex when subject's fatigue executes blink
The brain wave of the action interference potential that top or/and occipital lobe area induce in cerebral cortex, such case can not rule out, at this moment institute
The first β wave stated is often mV grades, than it is normal when big more of the brain wave of V grades of μ that generates, this first β wave
Measurement method is realized according to the following steps successively in the video cardton limiting value measuring system based on brain wave at one：
Step (1) constructs a video cardton limiting value measuring system based on brain wave, hereinafter referred to as system, including：
Video-see client computer, eeg signal acquisition instrument and digital signal processor DSP：
Eeg signal acquisition instrument, using the actiCAP Xpress Twist products of German BRAIN PRODUCTS companies,
Including：Brain wave EEG electrode caps, hereinafter referred to as electrode cap, 64 channel EEG amplifiers and EEG signals recorder, wherein：
Electrode cap, including 64 actiCAP active electrodes, with international 10-20 standard profiles, ground electrode FP1 and FP2 it
Between, FP1 and FP2 are the antinion leaves being located on cerebral cortex,
The cutoff frequency of 64 channel EEG amplifiers, the analog bandpass filter set up is 0.531~70Hz,
EEG signals recorder, sample frequency 500Hz,
Step (2) measures the video cardton limiting value by the following method successively in the electromagnetic shielding laboratory：
Step (2.1), data processor DSP form the synthetic video containing different duration interim cards, are stored in video-see
In client computer
Step (2.1.1) inputs BBC animal documentary films to the data processor DSP,
Step (2.1.2) sets segment number from the BBC animals documentary film, the content of setting clip durations does not weigh
Multiple multiple segments,
Step (2.1.3) is divided equally whole segments by the group number of setting, and the segments in every group is equal, then from wherein
Optional one group of video clip is control group, remaining is test group,
Step (2.1.4), to each test group, the setting moment after video clip starts to play, respectively with the machine transplanting of rice
The interim card for entering different durations constitutes the interim card video of synthesis, is output to video-see client computer, storage；
Step (2.2) selectes the qualified subject of setting quantity D, when each one brain wave is under tranquility in institute
The interim card video for watching the synthesis on video-see client computer is stated, makees acquiring brain waves experiment one by one, " qualification " refers to
Physical qualification qualification, cerebral cortex and each interelectrode impedance are less than 10K Ω and viewing behavior meets specification,
Step (2.3), casts out the data of the underproof subject of video-see focus, obtains the subject of data qualifier
Brain wave data,
Step (2.4), the pretreatment of qualified EEG brain wave datas, the reference potential of qualified EEG data be changed to TP9 and
TP10, TP9, TP10 are located at the parietotemporal region on cerebral cortex,
Step (2.5) measures the interim card limiting value of every subject according to the following steps successively
Step (2.5.1), sets in data processor DSP：
Interim card starts or the visual signal that terminates is transmitted to the time t of human brain through retina1=75mS,
The time that people handles visual signal is t2=200mS,
Neuron of the occipital lobe of responsible processing visual information in cerebral cortex to the muscle or eyes for controlling countenance
The time needed for brain wave is sent out no more than 100mS, that is, is less than the time of control arm motion, uses t3=100mS expressions,
Visual signal is 375mS the time required to from retina to the brain wave for brain control face emotional reactions occur, no
More than or equal to t1、t2、t3The sum of, with subject's age or health status difference,
Step (2.5.2) links together all fragment signals of subject and constitutes a subject in viewing video
Complete brain wave figure in the process,
Step (2.5.3), from calling in each subject in the synthetic video of the interim card in watching video overall process
The interim card frequency that is indicated with N, when occurring interim card initial time tBAnd finish time tE, useIndicate rising for n-th interim card
Begin the moment, usesIndicate the finish time of n-th interim card, n=1,2 ..., N, to each subject's all same,
Step (2.5.4) marks upper each secondary interim card in the complete brain wave figure of every subject in step (2.5.2)
The initial time of generationWith each secondary interim card finish timeSimultaneously with the momentFor starting point, mark out from the momentIt plays and is used for
At the time of until the brain wave that control brain generates dejected mood at the latestAgain with the momentFor starting point, mark out
From the momentAt the time of playing until the brain wave for generating excited mood at the latest for controlling brain
Step (2.5.5) is obtained from step (2.5.4)：
With the momentFor the brain wave t of the dejected mood of generation of starting pointB,EWhen expression,Brain wave It is generated in time, unit mS,
With the momentFor the brain wave t of the dejected mood of generation of starting pointS,EWhen expression,Brain wave It is generated in time, unit mS,
Step (2.5.6) is found out in the complete brain wave figure of each subject within N number of period for finding interim card：
With interim card start timeWhen as starting point, the brain wave of dejected mood is generatedThe section that may occur
With interim card finish timeWhen as starting point, the brain wave of excited mood is generatedThe section that may occur
Step (2.5.7) is found out 50 μ V or less within the 2N period of each subject and is occurred earliest in time
Brain wave be used as with there is first β wave that the moment indicatesWithAnd at the time of respective corresponding, due to every
At the time of position subject's brain wave occurs and amplitude is all unequal, for sum is the subject of D, obtains 2N × D in total
At the time of a brain wave and its generation,
Step (2.5.8), a first β wave of the 2N × D in total respectively obtained in N number of interim card period from every subject
Occur to select respectively in the moment one occur or end time at the latest as generation or the interim card limiting value of end time, indicate
ForOrIt is obtained from the same electrode corresponding to each subject to respectively obtain one
Interim card limiting value in a maximum interim card limiting value,
Step (2.6) finds out the interim card limit described in maximum two of all subjects from the result of step (2.5.8)
Value.
Description of the drawings
Fig. 1 block diagram of system.
The distribution of electrodes figure of Fig. 2 eeg signal acquisition electrode caps,：Electrode compartments are as follows：Antinion leaf (Fp：1-2)；Forehead
Leaf (AF：3-4,7-8, AFz)；Frontal lobe (F：1-8, Fz)；Middle frontal lobe (FC：1-8)；Volume temporal lobe (FT：7-10)；Temporal lobe (T：7-8)；
Central leaf (C：1-6)；Middle top (CP：1-8, CPz)；Push up temporal lobe (TP：7-10)；Top (P：1-8, Pz)；Parietal-occipital lobe (PO：3-
4,7-8, POz)；Occipital lobe (O：1-2, Oz).
The main program flow block diagram of Fig. 3 systems.
Fig. 4 estimate the schematic diagram of interim card limiting value from an interim card segment.
Fig. 5 calculate the oscillogram of interim card limiting value, 14 filaments represent 14 subjects everyone in selected channel, frequency
The average value of range power changes over time difference of signal when whether there is or not interim card, and solid line represents the average value of 14 filaments.
Specific implementation mode
The disclosed information retrieval including web material shows：
It is about 75mS the cerebro-retinal times that interim card generation or the visual signal terminated, which are transmitted to people, and human brain handles signal
Time is 200mS, according to web material analysis shows：The action command of brain active region passes to the time of hand muscle neuron
For 100mS, thus the time that estimation is transmitted to ocular nerve member from cerebral cortex occipital lobe since the delivery time is short, be not above
100mS, it is juvenile, young, old different, shorten with the reduction at age, thus first β wave that estimation occurs in interim card goes out
Existing time Estimate is in this open interval (275mS, 375mS)；In addition, data shows that cerebral cortex is being handled from retina
After the signal sent, then send out brain wave time be approximately equal to blink it is primary at the moment, one open one close in closed-eye time, and blink primary
The overall process of eye took in 0.2 second~0.4 second or 0.3 second~0.4 second time, if closed-eye time therein comprises up to half,
Also between 1.50~1.75 seconds, thus the time that the first β waves occur is also relatively reasonable between (275mS, 375mS).
It is to closely follow the last one at the time of due to interim card limiting value referring to corresponding to first β wave occurring after 275mS
The amplitude occurred after α waves the waveform big compared with α waves, thus, whether there is other mV grades of stray wave to be in β waves at this moment
It is not related, also what is also referred to is again 50 μ V waveforms below, therefore need not consider that electromagnetic interference is being pushed up with what blink generated
The minimum interference potential of leaf or occipital lobe matter need to only find out first amplitude occurred after the last one α wave and be more than most
The β waves of the latter α wave amplitudes can.
Black thick line in Fig. 5 is exactly to represent β waves, when there is first β wave, the size and slope of α waves before this
It is all smaller than it, from 350mS when variation from, and in rising.
Signal when occurring or terminate from interim card generates vision to retina image-forming about needs 75 milliseconds, and brain handles information and needs
200 milliseconds, processed signal passes to cerebral cortex and generates brain wave less than 100 milliseconds, at this moment, corresponds to interim card start time
Be user dejected mood, what it is corresponding to interim card end time is excited mood, determines and occurs what first β wave of moment occurred
Moment reflection at the latest is to start to generate the moment at the latest of dejected mood, when determining that user starts to generate the limit of dejected mood
Carve, determine the reflection of moment at the latest that first β wave of end time occurs be user it is dejected-the excited mood of calmness-beginning
Moment at the latest, its significance lies in that, user generated since the moment to user at the latest for starting to generate dejected mood excited mood this
Duration between the two reflects the macroscopic statistics result of subject group although being different for each subject
Although Caton phenomenon can not possibly be absolutely avoided, the time course of user emotion variation is objectively reflected, use is also reflected
Family is to the demand how long of interim card period allowed, since Caton phenomenon is mainly as caused by the hardware device defect of base station,
Effect to eliminate Caton phenomenon for evaluation base station provides the standard of a suitable tolerance, there is its realistic meaning, and interim card
Limiting value when generation more studies user and provides objective data to the negative emotions of video display process research user.
Bibliography
【1】Application [J] psychology of Ge Yan Chen Ya nanmu steady grandsons of Liu Yan virtue Lee to electrophysiologicalmeasurements measurements in user experience
Scientific advance, 2014,22 (6):959-967
Claims (1)
1. a kind of methods of evaluation of the video cardton limiting value based on brain wave, which is characterized in that video cardton limiting value refers to
Since each interim card period or finish time plays in cerebral cortex top or occipital lobe area generates first β waves this period not
Maximum value when being in the same interim card period with subject, first β wave refer to being regarded in interim card start time by being absorbed in
α waves when frequency are transformed into the first β wave generated when the β waves at mood dejected moment, or refer to being tested in interim card finish time
First β wave that the α waves that person is waited for by calmness generate when being transformed into the excited β waves of mood, first β wave further include once in a while
It is electromagnetically shielded the electromagnetic interference generated by instrument in laboratory or/and when subject's fatigue by the middle prefrontal area on cerebral cortex
It is sent to the brain wave interference potential that top or/and occipital lobe area induce in cerebral cortex that eyes neuron executes blink action,
Such case can not rule out, and the first at this moment described β wave is often mV grades, when the brain wave of V grades of the μ generated when normal
Big is more, the measurement method of this first β wave be at one in the video cardton limiting value measuring system based on brain wave according to
It is secondary according to the following steps to realize：
Step (1) constructs a video cardton limiting value measuring system based on brain wave, hereinafter referred to as system, including：Video
Watch client computer, eeg signal acquisition instrument and digital signal processor DSP：
Eeg signal acquisition instrument, using the actiCAP Xpress Twist products of German BRAIN PRODUCTS companies, wherein
Including：Brain wave EEG electrode caps, hereinafter referred to as electrode cap, 64 channel EEG amplifiers and EEG signals recorder, wherein：
Electrode cap, including 64 actiCAP active electrodes, with international 10-20 standard profiles, ground electrode between FP1 and FP2,
FP1 and FP2 is the antinion leaf being located on cerebral cortex,
The cutoff frequency of 64 channel EEG amplifiers, the analog bandpass filter set up is 0.531~70Hz,
EEG signals recorder, sample frequency 500Hz,
Step (2) measures the video cardton limiting value by the following method successively in the electromagnetic shielding laboratory：
Step (2.1), data processor DSP form the synthetic video containing different duration interim cards, are stored in video-see client
It holds in computer
Step (2.1.1) inputs BBC animal documentary films to the data processor DSP,
It is unduplicated to set segment number, the content of setting clip durations from the BBC animals documentary film for step (2.1.2)
Multiple segments,
Step (2.1.3) is divided equally whole segments by the group number of setting, and the segments in every group is equal, then from wherein optionally
One group of video clip is control group, remaining is test group,
Step (2.1.4), to each test group, the setting moment after video clip starts to play, difference radom insertion is not
With the interim card of duration, the interim card video of synthesis is constituted, is output to video-see client computer, is stored；
Step (2.2) is selected the qualified subject of setting quantity D, is regarded described when each one brain wave is under tranquility
The interim card video that the synthesis is watched on frequency viewing client computer, makees acquiring brain waves experiment, " qualification " refers to body one by one
Condition qualification, cerebral cortex and each interelectrode impedance are less than 10K Ω and viewing behavior meets specification,
Step (2.3), casts out the data of the underproof subject of video-see focus, obtains the brain of the subject of data qualifier
Wave data,
The reference potential of qualified EEG data is changed to TP9 and TP10 by step (2.4), the pretreatment of qualified EEG brain wave datas,
TP9, TP10 are located at the parietotemporal region on cerebral cortex,
Step (2.5) measures the interim card limiting value of every subject according to the following steps successively
Step (2.5.1), sets in data processor DSP：
Interim card starts or the visual signal that terminates is transmitted to the time t of human brain through retina1=75mS,
The time that people handles visual signal is t2=200mS,
The occipital lobe of responsible processing visual information in cerebral cortex is sent out to the muscle of control countenance or the neuron of eyes
Time needed for brain wave is not more than 100mS, that is, is less than the time of control arm motion, uses t3=100mS expressions,
Visual signal is 375mS the time required to from retina to the brain wave for brain control face emotional reactions occur, is not more than
Or it is equal to t1、t2、t3The sum of, with subject's age or health status difference,
Step (2.5.2) links together all fragment signals of subject and constitutes a subject in viewing video process
In complete brain wave figure,
Step (2.5.3) uses N tables from each subject is called in the synthetic video of the interim card in watching video overall process
The interim card frequency that shows, when occurring interim card initial time tBAnd finish time tE, useWhen indicating the starting of n-th interim card
It carves, usesIndicate the finish time of n-th interim card, n=1,2 ..., N, to each subject's all same,
Step (2.5.4) marks upper each secondary interim card in the complete brain wave figure of every subject in step (2.5.2) and occurs
Initial timeWith each secondary interim card finish timeSimultaneously with the momentFor starting point, mark out from the momentIt plays for controlling
At the time of brain is generated at the latest until the brain wave of dejected moodAgain with the momentFor starting point, mark out from when
It carvesAt the time of playing until the brain wave for generating excited mood at the latest for controlling brain
Step (2.5.5) is obtained from step (2.5.4)：
With the momentFor the brain wave t of the dejected mood of generation of starting pointB,EWhen expression,Brain wave It is generated in time, unit mS,
With the momentFor the brain wave t of the dejected mood of generation of starting pointS,EWhen expression,Brain wave It is generated in time, unit mS,
Step (2.5.6) is found out in the complete brain wave figure of each subject within N number of period for finding interim card：
With interim card start timeWhen as starting point, the brain wave of dejected mood is generatedThe section that may occur
With interim card finish timeWhen as starting point, the brain wave of excited mood is generatedThe section that may occur
Step (2.5.7), the brain that 50 μ V or less are found out within the 2N period of each subject and are occurred earliest in time
Electric wave be used as with there is first β wave that the moment indicatesWithAnd at the time of respective corresponding, due to every quilt
At the time of examination person's brain wave occurs and amplitude is all unequal, for sum is the subject of D, obtains 2N × D brain in total
At the time of electric wave and its generation,
Step (2.5.8), the generation of the 2N × D in total respectively obtained in N number of interim card period from every subject first β waves
Selected respectively in moment one occur or end time at the latest as generation or the interim card limiting value of end time, be expressed asOrCorrespond to what each subject obtained from the same electrode to respectively obtain one
A maximum interim card limiting value in interim card limiting value,
Step (2.6) finds out the interim card limiting value described in maximum two of all subjects from the result of step (2.5.8).
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Inventor after: Tao Xiaoming Inventor after: Chen Zhao Inventor after: Liu Yifeng Inventor after: Xiao Ailing Inventor after: Ge Ning Inventor after: Lu Jianhua Inventor before: Tao Xiaoming Inventor before: Chen Zhao Inventor before: Liu Yifeng Inventor before: Xiao Ailing Inventor before: Ge Ning Inventor before: Lu Jianhua |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |