CN108420430A - A kind of organoleptic substances sorting technique based on smell brain wave and PSO-SVM - Google Patents
A kind of organoleptic substances sorting technique based on smell brain wave and PSO-SVM Download PDFInfo
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Abstract
The organoleptic substances sorting technique based on smell brain wave and PSO SVM that the invention discloses a kind of, includes the following steps：S1, electroencephalogram spectrum information acquisition is carried out to candidate using brain machine interface system, that is, electroencephalograph；S2, acquired electroencephalogram modal data is pre-processed；S3, feature extraction is carried out to completing pretreated spectrum data based on linear characteristic and Analysis of Nonlinear Characteristics, including：Peak value, mean value, standard deviation, central value, centre frequency and the power of α, β, θ frequency range and and spectrum entropy totally 76 dimension datas as EEG signals research in brain electrical feature；S4, pattern-recognition is carried out using the method for particle group optimizing support vector machines (PSO SVM).The present invention can be pervasive in the sensory evaluation of substance, and sensory evaluation process is more succinct, more normative, preciseness and science.
Description
Technical field
The present invention relates to organoleptic substances sorting technique fields, and in particular to a kind of based on smell brain wave and PSO-SVM
Organoleptic substances sorting technique.
Background technology
Sensory evaluation is the intersection for collecting the subjects such as modern physiology, psychology, statistics and gradually developing, growing up
Frontier branch of science, sense organ professional is in the tune to new product development, basic research, dispensing and technique in entire appraisement system
It is whole, reduce in the appraisals such as cost, quality guarantee and products perfection and play decisive role.With the hair of science and technology
Exhibition, more and more precision instruments for analyzing flavor substance come into being, can not be complete but rely solely on Instrumental Analysis
The truly feels of full response human body, therefore human body evaluation still occupies an important position.During sensory evaluation, need
Personnel are participated in person in the sensory utilization such as vision, smell, sense of taste, are easy by daily life custom and diet feelings
The interference of condition, the sensory evaluation result provided pass through the thinking of brain, are doped with personal subjective factor, therefore have centainly
Subjectivity, poor repeatability.
EEG signals are a kind of basic bio signals of human body, are the effective means for recording brain activity, can be objective, true
Reflect human body physiological state on the spot, can be used for the auxiliary diagnosis of mental disease, including Parkinson's disease, Alzheimer disease, Weir
Inferior disease, epilepsy, brain tumor and schizophrenia etc..As the objective indicator of nervous function and physiological evaluation, by observing brain
Electric signal (EEG) can help us directly to understand electrophysiological change related with Xin Li, physiological status, by Novel presentation
Observation come determine may generation lesion.
Invention content
Based on above-mentioned analysis, the present invention provides a kind of organoleptic substances classification side based on smell brain wave and PSO-SVM
Method.
To achieve the above object, the technical solution that the present invention takes is：
A kind of organoleptic substances sorting technique based on smell brain wave and PSO-SVM, includes the following steps：
S1, electroencephalogram spectrum information acquisition is carried out to candidate using brain-computer interface system, that is, electroencephalograph；
S2, acquired electroencephalogram modal data is pre-processed；
S3, feature extraction, packet are carried out to completing pretreated spectrum data based on linear characteristic and Analysis of Nonlinear Characteristics
It includes：Peak value, mean value, standard deviation, central value, centre frequency and the power of α, β, θ frequency range and and spectrum entropy totally 76 dimension datas make
Brain electrical feature in being studied for EEG signals；
S4, pattern-recognition is carried out using the method for particle group optimizing support vector machines (PSO-SVM).
Wherein, the pretreatment of the eeg data, which includes at least, deletes bad block processing；Filter out 50Hz Hz noises；Stacked data
Add average treatment and wavelet transformation noise reduction process.
Wherein, the position of electrode is according to international standard lead 10-20 system rests, selection and the relevant Fp1, F3 of smell,
Electroencephalogram modal data corresponding to F7, Fz electrode.
The present invention can be pervasive in the sensory evaluation of substance, sensory evaluation process is more succinct, more normative, preciseness and
Science to the adjustment of new product development, basic research, dispensing and technique, reduces cost, quality guarantee and products perfection etc. and comments
Valence work plays an important roll.
Description of the drawings
Fig. 1 is the flow chart of data processing figure in the embodiment of the present invention
Fig. 2 is to filter out 50Hz Hz noise design sketch.
Fig. 3 is 7 groups of data investigation design sketch in the embodiment of the present invention.
Fig. 4 is the result figure after wavelet transformation.
Fig. 5 is fitness (accuracy rate) curve that PSO finds optimal parameter.
Specific implementation mode
In order to make objects and advantages of the present invention be more clearly understood, the present invention is carried out with reference to embodiments further
It is described in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this hair
It is bright.
Embodiment
Material and method：The beer of 3 kinds of different brands (Qingdao, blue zone, Harbin) is selected, alcohol concentration and raw material are such as
Shown in the following table 1：
The beer sample of 13 kinds of different brands of table
In terms of smell electroencephalogramsignal signal analyzing, used EEG signals are that data are adopted in laboratory certainly, collect original brain
After electric signal, brain electricity pretreatment is carried out first and (including deletes bad block, filters out 50Hz Hz noises, data investigation is average, small echo
Transformation and etc.)；Then linear analysis and nonlinear analysis are carried out to it, peak value that frequency-division section is obtained, mean value, standard
Difference, central value, centre frequency and power and and spectrum entropy as characteristic value；In view of the electrode of acquisition includes different region
Therefore electrode screening has been carried out；The characteristic value of selection is finally sent to corresponding grader, obtains final classification accuracy.
This patent flow chart of data processing figure is as shown in Figure 1.
This experiment places brain using NCERP series electroencephalogram and evoked potentuial measuring system, according to the worlds 10-20 brain electric system
Electric frequency acquisition DC-50Hz, sample frequency 256Hz can at most obtain 36 channel datas (this experiment obtains 24 channel datas),
The bioelectrical signals of subject Different brain region are respectively represented.For the completion experiment that subject can be concentrated one's energy, acquisition brain electricity
Signal needs stringent experimental situation, such as quiet and to keep faint light.
1. signal acquisition experiment flow
This experiment in, select the age between 23-26 Sui, dextro manuality, without any respiratory disorder, mental disease and
The subject of chronic disease.It allows subject to be in comfortable state, in real time the EEG signals of observation subject, waits for that its EEG signals is in steady
When determining state, olfactory stimulation gesture is sent out, experimenter randomly selects one from 3 kinds of samples and is gently placed on subject underthe nose
At 1-2cm and the stimulation of 2s is kept, so that subject is fully received olfactory stimulation, EEG signals make corresponding response.Once
After experiment terminates, laboratory windowing ventilation is tested abundant rest 1-2min and repeats above-mentioned experimental implementation later.
It should be noted that following points for attention during experiment acquisition：
Before acquisition, subject keeps clearheaded, and cleans hair with neutrality shampoo before starting eeg signal acquisition,
In order to avoid making to make wave distortion due to scalp resistance is excessive because grease is excessively high.Meanwhile experiment content simply is introduced to subject, it gets across
This experiment is not damaged no pain, is eliminated because its state of mind influences the influence of brain wave acquisition result.
In acquisition, subject hyperphoria with fixed eyeballs cover, earplug make it reduce the actions such as blink, eyeball movement, and it is comfortable to be tested holding
Posture, no any limb action occur, prevent from being mixed with excessive myoelectricity in brain electricity.Meanwhile experimenter controls experiment and carries out
Time, prevent subject occur fatigue or boredom.During trial interval is rested, actively linked up with subject, it is ensured that quilt
Examination keeps pleasant state.
2. the pretreatment of eeg data
Since collected EEG signals mix a variety of brains electricity (evoked brain potential, artefact, spontaneous brain electricity, noise etc.), so
Before the identification for carrying out smell brain electricity, needs to pre-process original EEG signals, thus obtain useful EEG signals.
The pretreatment of eeg data filters out 50Hz Hz noises including (1), it is made to reduce pollution of the noise background to signal,
Improve signal-to-noise ratio, retain the authenticity of original signal, filters out after 50Hz Hz noises that the results are shown in Figure 2；(2) data investigation
It is average, it, can will be random by superposed average since EEG signals are a kind of complex physiologic EEG signals of nonlinear and nonstationary
The spontaneous EEG signals of rule are offset, and regular evoked brain potential signal is enhanced, and realize that EEG signals time-domain information is visual
Change.In this experiment, the data that experiment is obtained carry out 7 groups of superposed averages, and data investigation design sketch is as shown in Figure 3；(3) small echo becomes
It changes method and carries out noise reduction, noise reduction is as shown in Figure 4.
3. the selection of electrode
The position of electrode is according to international standard lead 10-20 system rests, as shown in table 2.It, can in smell and sense of taste memory
To observe the interaction between prefrontal and marginal convolution.During carrying out long-term odor identification, socket of the eye frontal lobe region and bilateral
Cortex of temporal lobe is activated.In short term odor identification, right side temporal lobe is activated.In this experiment, it selects relevant with smell
Fp1, F3, F7, Fz electrode are analyzed.
2 ten-twenty electrode system electrode of table matches table name
4. the feature extraction of EEG signals
The data obtained after aforesaid operations are subjected to linear analysis, that is, extract its Linear Eigenvalue, including：α, β, θ frequency range
Peak value, mean value, standard deviation, central value, centre frequency and power and and spectrum entropy totally 76 dimension datas ground as EEG signals
Brain electrical feature in studying carefully.
5. mode identification method
In this experiment, pattern-recognition, classification are carried out using the method based on particle group optimizing support vector machines (PSO-SVM)
Rate of accuracy reached 83.33%.It is illustrated in figure 5 the support vector machines based on particle cluster algorithm and finds the process of optimal parameter from figure
As can be seen that when penalty factor c is 37.45, when kernel functional parameter g is 0.01,5 times of cross validation rate of accuracy reached 91.67%.
It can thus be seen that the method based on smell brain wave can classify the beer of different brands, therefore should
Method can be pervasive in the sensory evaluation of substance, to the adjustment of new product development, basic research, dispensing and technique, reduce cost,
The appraisals such as quality guarantee and products perfection play an important roll.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, it can also make several improvements and retouch, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (3)
1. a kind of organoleptic substances sorting technique based on smell brain wave and PSO-SVM, which is characterized in that include the following steps：
S1, electroencephalogram spectrum information acquisition is carried out to candidate using brain-computer interface system, that is, electroencephalograph；
S2, acquired electroencephalogram modal data is pre-processed；
S3, feature extraction is carried out to completing pretreated spectrum data based on linear characteristic and Analysis of Nonlinear Characteristics, including：α、
Peak value, mean value, standard deviation, central value, centre frequency and the power of β, θ frequency range and and spectrum entropy totally 76 dimension datas are electric as brain
Brain electrical feature in signal research；
S4, pattern-recognition is carried out using the method for particle group optimizing support vector machines (PSO-SVM).
2. a kind of organoleptic substances sorting technique based on smell brain wave and PSO-SVM as described in claim 1, feature exist
In the pretreatment of the eeg data, which includes at least, deletes bad block processing；Filter out 50Hz Hz noises；Data investigation average treatment
With wavelet transformation noise reduction process.
3. a kind of organoleptic substances sorting technique based on smell brain wave and PSO-SVM as described in claim 1, feature exist
In the position of electrode is according to international standard lead 10-20 system rests, selection and relevant Fp1, F3, F7, Fz electrode institute of smell
Corresponding electroencephalogram modal data.
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| CN114237383A (en) * | 2021-11-09 | 2022-03-25 | 浙江迈联医疗科技有限公司 | Multi-state identification method based on forehead single-lead brain electrical signal |
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Cited By (2)
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| CN114237383A (en) * | 2021-11-09 | 2022-03-25 | 浙江迈联医疗科技有限公司 | Multi-state identification method based on forehead single-lead brain electrical signal |
| CN114237383B (en) * | 2021-11-09 | 2024-03-12 | 浙江迈联医疗科技有限公司 | Multi-state identification method based on forehead single-lead electroencephalogram signals |
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