CN102389292A - Measurement method and device of difference between facial expressions - Google Patents
Measurement method and device of difference between facial expressions Download PDFInfo
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Abstract
The invention discloses a measurement method and a device of a difference between facial expressions. By two near-infrared probes arranged at ear frontal acupoints of left and right ears, signals reflected by the brain frontal regions corresponding to the ear frontal acupoints are extracted by a signal extraction circuit, the extracted signals are input by an X channel and a Y channel of an oscilloscope, and are displayed on the oscilloscope in a way of Lissajous figures superimposed into ball spots in an X-Y working mode, and a facial expression is identified by comparing the differences between areas comprised in corresponding ball spot movement trajectories before and after the facial expression changes. In the measurement method and device, only two near-infrared probes are utilized to measure the ear frontal acupoints corresponding to the brain frontal regions, and the ball spots superimposed by the Lissajous figures displayed by the extracted ear frontal acupoint signals on the oscilloscope are directly compared, accordingly, the accuracy is high, the structure is simple, the external filtering is not needed and the interference of noise is not considered, the method and device can be used for being tested in various environments, and can be widely used and popularized.
Description
Technical field
The present invention relates to the biological signal measuring technical field, more particularly, relate to a kind of measuring method and device of facial expression difference.
Background technology
Smile is human unique a kind of delicate action, is to produce the very high a kind of facial expression of frequency.When the mankind carry out This move, can play relieving stress and mind at rest effect.
The achievement in research of passing through the brain mechanism of expressing one's feelings to smiling modern age shows: the left front volume cortex of human brain is mainly taken charge of positively charged active mood; Right front volume cortex is mainly managed the negativity emotion.Current; Feature difference for the human facial expression of difference; Available technology adopting method the most widely has the method for nondestructive measurement human brain chemistry, electricity and magnetics characteristic, mainly comprises magnetic resonance spectrum imaging (MRS), positron emission tomography imaging (PET), magneticencephalogram (MEG) and electroencephalogram (EEG) etc. based on said method.When the feature difference that utilizes first three methods to carry out facial expression was measured, the cost of identification facial expression was higher, and promptly needed expense is very high, is unfavorable for being widely used; And when utilizing the relatively low electroencephalogram of expense that the feature difference of facial expression is measured, need the probe of about 10～120 passages, and comparatively complicated, be not used in equally and be widely used.
Therefore, a kind of high accuracy that had both guaranteed to measure facial expression feature difference of current special needs is beneficial to measuring method and the device that is widely used simultaneously again.
Summary of the invention
In view of this, the invention provides a kind of measuring method and device of facial expression difference, to overcome in the prior art because the equipment of measuring is comparatively complicated and cost is high when measuring, thereby be unfavorable for the problem that is widely used.
For realizing above-mentioned purpose, the present invention provides following technical scheme:
A kind of measuring method of facial expression difference comprises:
Confirm test point, said test point is the ear volume cave of left ear and auris dextra;
The facial expression of obtaining test changes two groups of active near-infrared transmission voltage signals of the said test point output in front and back;
Two groups of said active near-infrared transmission voltage signals are shown with the lissajouf figure mode, obtain the synergetic first ball speckle and the second ball speckle;
Calculate first area and the second area that track comprised of corresponding said first ball speckle and the motion of the second ball speckle;
More said first area and second area;
When said first area during greater than second area, the facial expression of the corresponding test of said first area be tranquil expression, and the facial expression of the corresponding test of said second area is expressed one's feelings for smiling;
When said first area during less than second area, the facial expression of the corresponding test of said first area is the expression of smiling, and the facial expression of the corresponding test of said second area be tranquil the expression.
Preferably, the said facial expression of obtaining test also comprises before:
When working in the X-Y mode of operation, when signal extracting circuit does not power on, obtain this earth speckle that remains static.
Preferably, said two groups initiatively in the near-infrared transmission voltage signals, every group of active near-infrared transmission voltage signal that export respectively in the ear volume cave that comprises two route test points left side ear and auris dextra.
Preferably, the facial expression of testing when said first area correspondence is tranquil expression, and the corresponding facial expression of testing of said second area is that said second area is 0.95～0.99 times of said first area when smiling expression.
Preferably, the wave-length coverage of said active near-infrared transmission voltage signal is 850 nanometers～900 nanometers.
Preferably, obtain the 875 nanometers active near-infrared transmission voltage signal that said test point is exported respectively.
Preferably, comprising:
When the facial expression of the corresponding test of said first area was expressed one's feelings for smiling, the center of the first ball speckle that said first area is corresponding was a basic point with the center of said earth speckle, and L length moves right;
When the facial expression of the corresponding test of said second area was tranquil the expression, the center of the second ball speckle that said second area is corresponding was a basic point with the center of said earth speckle, and M length moves right;
Said M length is greater than L length.
Preferably, the scope of said M length is: 1.02L～1.10L; The span of said L length is: 3.0 centimetres～5.0 centimetres.
A kind of measuring device of facial expression difference comprises:
Be arranged at the left and right sides near-infrared probe at the place, ear volume cave of test point left side ear and auris dextra respectively;
The signal extracting circuit that connects said left and right sides near-infrared probe respectively;
The oscillograph that connects the said signal extracting circuit of two-way, the signal that the said signal extracting circuit of two-way extracts is imported through said oscillographic X passage and Y passage, and on said oscillograph, shows with the X-Y mode of operation.
Can know via above-mentioned technical scheme; Compared with prior art; The invention discloses a kind of measuring method and device of facial expression difference; Only two near-infrared probes in the ear volume cave through being arranged at people left and right sides ear under the situation that facial expression changes, extract the signal that corresponding brain frontal region, ear volume cave is reflected through signal extracting circuit; The signal that extracts is imported through oscillographic X passage and Y passage; And on this oscillograph, be superimposed as the lissajouf figure into the ball speckle with the demonstration of X-Y mode of operation, and through contrasting the diversity that facial expression changes the pairing ball speckle area that movement locus comprises in front and back, the identification facial expression mainly is that smile is expressed one's feelings and the calmness expression.The present invention only utilizes two near infrared ray probes that the ear volume cave of corresponding brain frontal region is measured; And directly relatively extracting ear volume cave signal shows the ball speckle that lissajouf figure is superimposed as on oscillograph; Accuracy rate is high and simple in structure; And need not the interference of filtered external and consideration of noise, and can in various environment, test, promptly can be widely used and promote.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is embodiments of the invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the accompanying drawing that provides.
Fig. 1 is the flow chart of the measuring method of the disclosed a kind of facial expression difference of the embodiment of the invention;
Fig. 2 is the flow chart of the measuring method of the disclosed another kind of facial expression difference of the embodiment of the invention;
Fig. 3 is the disclosed ball speckle of an embodiment of the invention feature identification sketch map;
Fig. 4 is the structural representation of the measuring device of the disclosed a kind of facial expression difference of the embodiment of the invention.
The specific embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Can know by background technology; The cost of employed magnetic resonance spectrum imaging (MRS), positron emission tomography imaging (PET) and magneticencephalogram (MEG) is higher when being used to carry out the measurement of feature difference of facial expression in the prior art; The probe that then needs about 10～120 passages based on the measurement of electroencephalogram (EEG); Comparatively complicated, thereby above-mentioned cost is higher, the metering system of testing complex all is unfavorable for being used widely.
Therefore, the invention discloses a kind of novel facial expression feature difference measuring method and device,, guarantee that simultaneously it simple in structurely is beneficial to it to be widely used and to promote in high accuracy that guarantee to measure facial expression feature difference.
The principle of institute of the present invention foundation is: because cranial nerve blood vessel coupling exists high correlation, be specially endogenous material such as people's BNT and cerebral oxygenation hemoglobin and have biochemistry low-frequency oscillation (characteristic of 10mHz～80mHz) and the non-linear space-time characteristics that are coupled.Minimizing and expression by three kinds of main BNT content of molecular biology proof present dependency.Wherein, left front volume cortex is mainly taken charge of positively charged active mood, and right front volume cortex is mainly managed the negativity emotion.
Because the ear volume cave corresponding with it, brain frontal region presents the bidirectional reflectance relation, wherein, about 2/3 ratio is offside control.Choose ear volume cave in the present invention as test point, be intended to measure indirectly human brain frontal region information.And because ear-lobe (top) is rich in arterial blood oxygen, the blood oxygen saturation of learning the ear-lobe position through medical measurement is up to 97%.In the low absorbing window 700nm～900nm (nm, nanometer) of near-infrared of tissue, the ratio that HbO2 Oxyhemoglobin and reduced hemoglobin absorb preferred 875nm light wave is about 2: 1.Take the anti-phase characteristics that HbO2 Oxyhemoglobin and reduced hemoglobin transport into consideration; The present invention adopts the absorption of single wavelength light (advantage is away from water peak 960nm) to HbO2 Oxyhemoglobin; Extract the HbO2 Oxyhemoglobin near-infrared transmission voltage signal in two-way ear volume cave, the left and right sides; Need not through filtering; Give oscillograph two probes respectively, adopt the X-Y mode of operation to show the ball speckle that lissajouf figure is superimposed as, the area that the ball speckle comprises during based on measurement is along with the diversity between the different expressions of variation contrast of difference expression.Detailed process describes through following examples.
Embodiment one
See also accompanying drawing 1, the flow chart for the present invention discloses a kind of measuring method of facial expression difference mainly may further comprise the steps:
Step S101 confirms test point, and said test point is the ear volume cave of left ear and auris dextra.
The process of in step S101, confirming test point is to select the process at acupuncture point, and selected acupuncture point is respectively the ear volume cave of left ear and auris dextra, and these two ear volume caves are corresponding with the brain frontal region and present bidirectional reflectance and concern.
Step S102, the facial expression of obtaining test changes two groups of active near-infrared transmission voltage signals of the said test point output in front and back.
When execution in step S102; Two kinds of different expressions before and after the difference test subject; And obtain two groups of active infrared transmission voltage signals of the corresponding two kinds of expression outputs of test point, because two corresponding ear volume caves of test point, promptly left Er Ere cave and auris dextra ear volume cave; Therefore, each group comprises the active near-infrared transmission voltage signal that two-way is exported respectively by the ear volume cave of left ear and auris dextra respectively respectively.
Step S103 shows two groups of said active near-infrared transmission voltage signals with the lissajouf figure mode, obtain the synergetic first ball speckle and the second ball speckle.
Execution in step S103; With two groups of active near-infrared transmission voltage signals that obtain among the step S102; Show on oscillograph with the lissajouf figure mode that respectively obtain the synergetic first ball speckle and the second ball speckle, the characteristic of beating of the area of these two ball speckles meets the rule of beating of human heart.
Step S104 calculates first area and the second area that track comprised of corresponding said first ball speckle and the motion of the second ball speckle.
Execution in step S104; Movement locus according to the first ball speckle and the second ball speckle calculates first area and the second area that its correspondence comprises; The area that promptly movement locus of the first ball speckle is corresponding is first area, and the area that the movement locus of the second ball speckle is corresponding is a second area.
Whether step S105 judges said first area greater than second area, if, execution in step S106 then; If deny, then execution in step S107.
Step S106 confirms that the facial expression of the corresponding test of first area is tranquil expression, and the facial expression of the corresponding test of second area is the expression of smiling.
The condition of obtaining execution in step S106 is: said first area is greater than second area.
Step S107 confirms that the facial expression of the corresponding test of first area is the expression of smiling, and the facial expression of the corresponding test of second area is tranquil expression.
The condition of obtaining execution in step S107 is: said first area is less than second area.
Need to prove that the wave-length coverage of above-mentioned active near-infrared transmission voltage signal is 850 nanometers～900 nanometers.Comparatively preferably obtain the 875 nanometers active near-infrared transmission voltage signal that said test point is exported respectively.
Difference to the different facial expressions of step S105 judges, is based on endogenous material such as people's BNT and cerebral oxygenation hemoglobin and has biochemistry low-frequency oscillation (characteristic of 10mHz～80mHz) and the non-linear space-time characteristics that are coupled.In extracting the ball speckle that signal showed; The area that ball speckle movement locus under the neutral emotion (tranquil expression) is comprised is bigger than the area that the pairing ball speckle movement locus of positively charged active mood (expression of smiling) is comprised; And disperse, promptly the ball shape of spot of the smile of corresponding positively charged active mood expression is concentrated than the ball speckle of the calmness expression of corresponding neutral emotion.
Thereby the contrast of the feature difference that obtains through above-mentioned measurement, can discern smile expression and tranquil expression, promptly can discern neutral emotion and positively charged active mood.
And directly relatively extracting ear volume cave signal shows the ball speckle that lissajouf figure is superimposed as on oscillograph; Accuracy rate is high and simple in structure; And need not the interference of filtered external and consideration of noise, and can in various environment, test, promptly can be widely used and promote.
On the basis of the invention described above, before the facial expression of obtaining test, also comprise oscillograph is debugged, when making it show the no signal input, this earth speckle that remains static.Describe to the detailed process of successively testing two different facial expressions on this basis.
See also accompanying drawing 2, mainly may further comprise the steps:
Step S201, initialization, when showing the no signal input, this earth speckle that remains static.
When execution in step S201, be under the X-Y mode of operation, signal extracting circuit is not powered on, no signal input this moment, when on oscillograph, showing the no signal input, this earth speckle that remains static.
Step S202 confirms test point, and said test point is the ear volume cave of left ear and auris dextra.
Step S203, when obtaining current test facial expression, the two-way that the ear volume cave of test point left and right sides ear is exported is the near-infrared transmission voltage signal initiatively.
Step S204 shows the said active near-infrared transmission of two-way voltage signal with the lissajouf figure mode, obtain the synergetic first ball speckle.
Step S205 calculates first area that track comprised of said first ball speckle motion.
Step S206, when obtaining the facial expression that the next one tests, the two-way that the ear volume cave of test point left and right sides ear is exported is the near-infrared transmission voltage signal initiatively.
Step S207 shows the said active near-infrared transmission of two-way voltage signal with the lissajouf figure mode, obtain the synergetic second ball speckle.
Step S208 calculates the second area that track comprised of said second ball speckle motion.
Whether step S209 judges said first area greater than second area, if, execution in step S210 then; If deny, then execution in step S211.
Step S210 confirms that the facial expression of the corresponding test of first area is tranquil expression, and the facial expression of the corresponding test of second area is the expression of smiling.
Step S211 confirms that the facial expression of the corresponding test of first area is the expression of smiling, and the facial expression of the corresponding test of second area is tranquil expression.
Need to prove; See also accompanying drawing 3; Ball speckle feature identification sketch map to showing can be known; When the facial expression of the corresponding test of the first area S1 was expressed one's feelings for smiling, the center of the first ball speckle A that the said first area S1 is corresponding was a basic point with the center of said earth speckle O, and L length moves right.
At this moment, when the facial expression of the corresponding test of said second area S2 was tranquil the expression, the center of the second ball speckle B that said second area S2 is corresponding was a basic point with the center of said earth speckle O, and M length moves right.Can know that by Fig. 3 this M length specifically uses formula (1) to be expressed as greater than L length:
M＝L×[1+(2％～10％)] (1)
The scope that is M length is: 1.02L～1.10L.
Can know that by Fig. 3 the corresponding ball speckle B of corresponding tranquil expression comparatively disperses than the corresponding ball speckle A of expression that smiles.Area S1 and S2 then are the scope that track comprised of beating of corresponding ball speckle.
The beat area S1 of track and the comparison of S2 can be known to two ball speckles: S1=S2 * [1-(1%～5%)], the promptly said first area S1 are 0.95～0.99 times of said second area S2.
Need to prove that to said process, the facial expression of testing when first area correspondence is tranquil expression, the corresponding facial expression of testing of second area is that first area of this moment is S2 when smiling expression, and second area is S1.Confirm that promptly the pairing ball speckle of tranquil expression gets final product greatly than the ball speckle of the correspondence of the expression of smiling.
In the process of display ball speckle, the scope of the length of the L that is shown on the oscillograph is under above-mentioned X-Y mode of operation: 3.0～5.0 lattice are 3.0～5.0 centimetres; The span of S2 is: 0.8 lattice *, 0.8 lattice～1.5 lattice *, 1.5 lattice, promptly 0.8 centimetre～1.5 centimetres * of 0.8 centimetre of * 1.5 centimetres.Thus, according to formula (1), and the relation of S1 and S2, can know the span of S1 and M.
Describe a kind of measuring method of facial expression difference among the disclosed embodiment of the invention described above in detail; Can adopt the device of various ways to realize for method of the present invention; Therefore the invention also discloses a kind of measuring device of facial expression difference, provide concrete embodiment below and be elaborated.
See also accompanying drawing 4; Structural representation for the measuring device of the disclosed a kind of facial expression difference of the embodiment of the invention; Mainly comprise: left and right near-infrared probe 101 (L among Fig. 4 representes left ear, and R representes auris dextra), two signal extracting circuits 102 and oscillograph 103.
Left and right sides near-infrared probe 101 is arranged at the place, ear volume cave of test point left side ear and auris dextra, is used to test the two-way active near-infrared transmission voltage signal that export in the ear volume cave of left ear and auris dextra.
Two signal extracting circuits 102; Connect said left and right sides near-infrared probe 101 respectively; The two-way that test is got access to is the near-infrared transmission voltage signal initiatively, and X passage and Y passage through oscillograph 103 input in the oscillograph 103 that is connected with two signal extracting circuits 102.
This oscillograph 103 shows the two-way active near-infrared transmission voltage signal that obtains with the X-Y mode of operation, obtains stack ball speckle with the lissajouf figure mode.
Through the ball speckle that the different active near-infrared transmission voltage signal that collects before and after the contrast is reflected, i.e. the diversity of the area that movement locus comprises of its ball speckle, identification facial expression mainly are that the expression of smiling is expressed one's feelings with tranquil.
In sum:
The present invention measures the ear volume cave of corresponding brain frontal region through utilizing two near infrared ray probes; And directly relatively extracting ear volume cave signal shows the ball speckle that lissajouf figure is superimposed as on oscillograph; Accuracy rate is high and simple in structure; And need not the interference of filtered external and consideration of noise, and can in various environment, test, promptly can be widely used and promote.
Each embodiment adopts the mode of going forward one by one to describe in this description, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the embodiment disclosed method, so description is fairly simple, relevant part is partly explained referring to method and is got final product.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can be directly with the software modules of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in moveable magnetic disc, CD-ROM or the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (9)
1. the measuring method of a facial expression difference is characterized in that, comprising:
Confirm test point, said test point is the ear volume cave of left ear and auris dextra;
The facial expression of obtaining test changes two groups of active near-infrared transmission voltage signals of the said test point output in front and back;
Two groups of said active near-infrared transmission voltage signals are shown with the lissajouf figure mode, obtain the synergetic first ball speckle and the second ball speckle;
Calculate first area and the second area that track comprised of corresponding said first ball speckle and the motion of the second ball speckle;
More said first area and second area;
When said first area during greater than second area, the facial expression of the corresponding test of said first area be tranquil expression, and the facial expression of the corresponding test of said second area is expressed one's feelings for smiling;
When said first area during less than second area, the facial expression of the corresponding test of said first area is the expression of smiling, and the facial expression of the corresponding test of said second area be tranquil the expression.
2. method according to claim 1 is characterized in that, the said facial expression of obtaining test also comprises before:
When working in the X-Y mode of operation, when signal extracting circuit does not power on, obtain this earth speckle that remains static.
3. method according to claim 1 and 2 is characterized in that, said two groups initiatively in the near-infrared transmission voltage signals, and every group of active near-infrared transmission voltage signal that export respectively in the ear volume cave that comprises two route test points left side ear and auris dextra.
4. method according to claim 1 and 2; It is characterized in that; The facial expression of testing when said first area correspondence is tranquil expression, and the corresponding facial expression of testing of said second area is that said second area is 0.95～0.99 times of said first area when smiling expression.
5. method according to claim 1 and 2 is characterized in that, the wave-length coverage of said active near-infrared transmission voltage signal is 850 nanometers～900 nanometers.
6. method according to claim 5 is characterized in that, obtains the 875 nanometers active near-infrared transmission voltage signal that said test point is exported respectively.
7. method according to claim 2 is characterized in that, comprising:
When the facial expression of the corresponding test of said first area was expressed one's feelings for smiling, the center of the first ball speckle that said first area is corresponding was a basic point with the center of said earth speckle, and L length moves right;
When the facial expression of the corresponding test of said second area was tranquil the expression, the center of the second ball speckle that said second area is corresponding was a basic point with the center of said earth speckle, and M length moves right;
Said M length is greater than L length.
8. method according to claim 7 is characterized in that the scope of said M length is: 1.02L～1.10L; The span of said L length is: 3.0 centimetres～5.0 centimetres.
9. the measuring device of a facial expression difference is characterized in that, comprising:
Be arranged at the left and right sides near-infrared probe at the place, ear volume cave of test point left side ear and auris dextra respectively;
The signal extracting circuit that connects said left and right sides near-infrared probe respectively;
The oscillograph that connects the said signal extracting circuit of two-way, the signal that the said signal extracting circuit of two-way extracts is imported through said oscillographic X passage and Y passage, and on said oscillograph, shows with the X-Y mode of operation.
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| CN102880656A (en) * | 2012-08-30 | 2013-01-16 | 苏州大学 | Method and system for decoding speech center, and lock with system |
| CN102880656B (en) * | 2012-08-30 | 2015-03-25 | 苏州大学 | Method and system for decoding speech center, and lock with system |
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