CN101912256A - Method for processing dynamic spectral data based on single-edge extraction - Google Patents
Method for processing dynamic spectral data based on single-edge extraction Download PDFInfo
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Abstract
The invention discloses a method for processing dynamic spectral data based on single-edge extraction, and relates to the field of spectral analysis technology. The method comprises the following steps of: acquiring the all-band photoplethysmographic pulse wave; acquiring an all-band photoplethysmographic pulse wave template by using the all-band photoplethysmographic pulse wave and correcting the waveform of the photoplethysmographic pulse wave with each wavelength so as to eliminate the error introduced by the instability of the waveform of the photoplethysmographic pulse wave with each wavelength; removing single-edge dynamic spectrum comprising gross error by using the average effect of single-edge dynamic spectrums corresponding to a front edge and a rear edge of each pulse period according to a 3sigma rule; and superposing the remaining single-edge dynamic spectrums after the removal of the gross error to obtain dynamic spectral output. The method fully utilizes the acquired spectral data, improves the accuracy of the waveform of the photoplethysmographic pulse wave within each wavelength and each period, has higher accuracy, obviously improves the measurement speed, effectively improves the dynamic spectral signal-to-noise ratio and improves the accuracy of dynamic spectral method-based noninvasive blood component detection.
Description
Technical field
The present invention relates to field of spectral analysis technology, particularly a kind of method for processing dynamic spectral data based on the extraction of single edge that can improve dynamic spectrum analysis precision and efficient.
Background technology
The principle of dynamic spectrum obtains to contain the photoelectricity volume pulsation wave of pulsation part arterial blood information for adopting the rayed pad of finger in certain wave-length coverage.Can prove in theory, the variation of transmitted light intensity only with the full of pulsation part arterial blood with shrink relevantly, then can be reflected in the absorbance difference of different wavelengths of light on the amplitude of photoelectricity volume pulsation wave of corresponding wavelength.Therefore, dynamic spectrum can be eliminated the long-pending constant component of appearances (body) such as horny layer, subcutaneous fat, vein and blood thereof to measuring the spectrographic influence of pulsation part arterial blood.After each wavelength light Power Capacity pulse wave was taken the logarithm, its peak value was the absorbance amplitude of forming dynamic spectrum.
Extract the peak-to-peak value difficulty and the bigger problem of error of photoelectricity pulse volume ripple in order to eliminate time domain, adopt the frequency domain extraction method in the prior art usually, for example: fourier transform method.Fourier transform have linear character and in the ideal case the pairing photoelectricity volume pulsation wave of different wave length be similar, thereby can substitute the peak-to-peak value of absorbance with the humorous wave amplitude of the maximum amplitude after the Fourier transformation, promptly extract first concentration of energy Frequency point k in the frequency spectrum of logarithm photoelectricity pulse volume ripple under each wavelength
λAmplitude X (the k at place
λ) substitute the peak-to-peak value of pulse wave, with X (k
λ) arrange back composition dynamic spectrum by wavelength X.Be formulated as follows:
A in the formula
iBe each component absorbance coefficient, c
iBe each concentration of component, d is an equivalent optical path length, A
λBe the absorbance of pulsation arterial blood, I
λ Max, I
λ MinBe incident intensity and output intensity.According to the theory of dynamic spectrum, the frequency domain extraction method increases than the peak-to-peak value precision of directly extracting time-domain signal, but the required sampling time is longer.Under long-time measurement situation, the human body normal physiological activity can cause the instability of pulse wave period, amplitude and baseline, has certain difference thereby make between each pulse cycle waveform.The frequency domain extraction method is difficult to avoid these unusual waveforms and instantaneous interferential influence, can only after all measuring end the data quality be estimated, and has influenced measurement efficient.Though existing quality of data evaluation criterion can be found the problem that spectroscopic data exists, and can't improve the spectroscopic data quality, the precision of spectroscopic data also is subjected to the influence of quality of data evaluation criterion simultaneously.
Summary of the invention
In order to solve the influence that present dynamic spectrum frequency domain extraction method is brought, the invention provides a kind of method for processing dynamic spectral data that extracts based on single edge, said method comprising the steps of:
(1) obtains all band photoelectricity volume pulsation wave, utilize described all band photoelectricity volume pulsation wave to constitute all band photoelectricity volume pulsation wave template, and proofread and correct each wavelength light Power Capacity pulse waveform with this, eliminate the unstable error of introducing of each wavelength light Power Capacity pulse waveform;
(2) according to 3 σ criterions, the list that utilizes each pulse cycle forward position and tailing edge correspondence along the average effect of dynamic spectrum remove contain gross error list along dynamic spectrum, will remove the dynamic spectrum output that remaining list obtains along the dynamic spectrum superposed average after the gross error.
Obtain all band photoelectricity volume pulsation wave described in the step (1), utilize described all band photoelectricity volume pulsation wave to obtain all band photoelectricity volume pulsation wave template, and proofread and correct each wavelength light Power Capacity pulse waveform with this, eliminate the unstable error of introducing of each wavelength light Power Capacity pulse waveform, specifically comprise:
Gather all band photoelectricity volume pulsation wave of detected part;
To described photoelectricity volume pulsation wave take the logarithm, superposed average, obtain all band photoelectricity volume pulsation wave template;
Described all band photoelectricity volume pulsation wave template is carried out segmentation and removed baseline and handle and obtain photoelectricity volume pulsation wave forward position template and tailing edge template;
Forward position and tailing edge waveform according to described each photoelectricity volume pulsation wave forward position template and the corresponding photoelectricity volume pulsation wave of tailing edge template calibration all wavelengths;
Obtain the ratio of each wavelength light Power Capacity pulse wave and photoelectricity volume pulsation wave forward position template and tailing edge template by least square fitting, described ratio is exported along dynamic spectrum as each pulse list.
Described in the step (2) according to 3 σ criterions, the list that utilizes each pulse cycle forward position and tailing edge correspondence is removed along the average effect of dynamic spectrum and is contained the list of gross error along dynamic spectrum, remaining list after removing gross error along the dynamic spectrum output that the dynamic spectrum superposed average obtains, is specifically comprised:
The wavelength ordering is pressed with the ratio of described corresponding photoelectricity volume pulsation wave forward position template and tailing edge template in described each photoelectricity volume pulsation wave forward position and tailing edge, carry out normalized, obtain single along dynamic spectrum;
With all described lists along dynamic spectrum superposed average template as the dynamic spectrum of measuring;
Obtain the similarity degree of described list with Euclidean distance along dynamic spectrum and superposed average template;
In the measuring process of dynamic spectrum, according to 3 σ criterions, judge whether each list exists gross error along dynamic spectrum, if, removal contains the list of gross error along dynamic spectrum, until not existing the list that contains gross error till the dynamic spectrum, remaining list is added the dynamic spectrum output that on average obtains along dynamic spectrum; If not, all lists are added the dynamic spectrum output that on average obtains along dynamic spectrum, flow process finishes.
The beneficial effect of technical scheme provided by the invention is:
Method provided by the invention has made full use of the spectroscopic data that collects, improved the accuracy of photoelectricity volume pulse waveform in each wavelength and each cycle, the list of dynamic spectrum is compared with the frequency domain extraction method along extraction method, not only has higher precision, can also improve measuring speed significantly, effectively raise the signal to noise ratio of dynamic spectrum, thereby improved the precision that detects based on dynamic spectrum method noinvasive blood constituent.
Description of drawings
Fig. 1 is provided by the invention based on the flow chart of photoelectricity volume pulsation wave list along the method for processing dynamic spectral data that extracts;
Fig. 2 is the flow chart with aligning step of obtaining of all band photoelectricity volume pulsation wave provided by the invention;
Fig. 3 is the flow chart of rejecting step with gross error that obtains of dynamic spectrum provided by the invention.
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
In order to solve the influence that present dynamic spectrum frequency domain extraction method is brought, it is a kind of based on single method for processing dynamic spectral data along extraction that the embodiment of the invention provides, and referring to Fig. 1, Fig. 2 and Fig. 3, see for details hereinafter and describe,
101: obtain all band photoelectricity volume pulsation wave, utilize all band photoelectricity volume pulsation wave to constitute all band photoelectricity volume pulsation wave template, and proofread and correct each wavelength light Power Capacity pulse waveform with this, eliminate the unstable error of introducing of each wavelength light Power Capacity pulse waveform;
This step specifically comprises step 1011-1015, sees for details hereinafter to describe:
1011: all band photoelectricity volume pulsation wave of gathering detected part;
Wherein, treat that the side can be finger or other position, during specific implementation, the embodiment of the invention does not limit this.
1012: to photoelectricity volume pulsation wave data take the logarithm, superposed average, obtain all band photoelectricity volume pulsation wave template;
This step is specially: because synchronization has similarity at resulting each wavelength light Power Capacity pulse wave of same a part of pulsatile blood that same area collects, the photoelectricity volume pulsation wave superposed average of whole wavelength or part wavelength correspondence can be got access to all band photoelectricity volume pulsation wave template.
1013: all band photoelectricity volume pulsation wave template is carried out segmentation and removed baseline and handle and obtain photoelectricity volume pulsation wave forward position template and tailing edge template;
This segment processing is specially: " ideal " waveform that is shaped as photoelectricity volume pulsation wave in the corresponding pulse cycle of each wavelength of all band photoelectricity volume pulsation wave in a certain pulse cycle, order is extracted maximum, the minima of being somebody's turn to do " ideal " waveform, and correspondence obtains the interval and trailing edge interval of some rising edges; The influence that this removal baseline is handled is specially the photoelectricity pulse volume wave datum in rising edge interval and the trailing edge interval is deducted its corresponding minima, obtains photoelectricity volume pulsation wave forward position template and tailing edge template.
1014: according to each photoelectricity volume pulsation wave forward position template and corresponding photoelectricity volume pulsation wave forward position of tailing edge template calibration all wavelengths and tailing edge waveform;
This step is specially: with the corresponding photoelectricity volume pulsation wave of dividing each wavelength correspondence between photoelectricity volume pulsation wave forward position template and tailing edge template region, deduct the corresponding interval interior minima of each wavelength, obtain the photoelectricity volume pulsation wave of each wavelength correspondence.
1015: obtain the ratio of each wavelength light Power Capacity pulse wave and photoelectricity volume pulsation wave forward position template and tailing edge template by least square fitting, this ratio is as the dynamic spectrum output on each edge.
Because synchronization has similarity at resulting each wavelength dynamic photoelectric volume pulsation wave of same a part of pulsatile blood that same area collects, adopt linear function: y
Data=k * x
Data+ b describes corresponding interval relation with each wavelength between photoelectricity volume pulsation wave template region.With the rising edge interval in a certain pulse cycle of light Power Capacity pulse wave template is example, with therebetween spectroscopic data as x
Data, the corresponding interval interior spectroscopic data of each wavelength X is as y
Data, obtain the photoelectricity volume pulsation wave of each wavelength X correspondence in this interval and the ratio k of forward position template and tailing edge template by least square fitting
λ, these ratios have constituted each list along dynamic spectrum.
102: according to 3 σ criterions, the list that utilizes each pulse cycle forward position and tailing edge correspondence along the average effect of dynamic spectrum remove contain gross error list along dynamic spectrum, will remove the dynamic spectrum output that remaining list obtains along the dynamic spectrum superposed average after the gross error.
This step specifically comprises step 1021-1024, sees for details hereinafter to describe:
1021: the wavelength ordering is pressed with the ratio of corresponding photoelectricity volume pulsation wave forward position template and tailing edge template in each photoelectricity volume pulsation wave forward position and tailing edge, carry out normalized, obtain single along dynamic spectrum;
Wherein, with each photoelectricity volume pulsation wave forward position and tailing edge ratio k with corresponding photoelectricity volume pulsation wave forward position template and tailing edge template
λBy the wavelength X ordering, carry out after the normalized, obtain single along dynamic spectrum.
1022: all are single along the dynamic spectrum of dynamic spectrum superposed average template as measurement;
1023: obtain single similarity degree along dynamic spectrum and superposed average template with Euclidean distance;
Wherein, use Euclidean distance
Describe single similarity degree along dynamic spectrum and superposed average template, Euclidean distance is more for a short time to show that list is high more along the similarity degree of dynamic spectrum and superposed average template.
1024: in the measuring process of dynamic spectrum, according to 3 σ criterions, judge whether each list exists gross error along dynamic spectrum, if, removal contains the list of gross error along dynamic spectrum, until not existing the list that contains gross error till the dynamic spectrum, the dynamic spectrum output that remaining list is obtained along the dynamic spectrum superposed average; If not, all lists are added the dynamic spectrum output that on average obtains along dynamic spectrum, flow process finishes.
Wherein, motion artifacts or interferential existence are arranged in the measuring process, can influence the certainty of measurement of dynamic spectrum, calculate the meansigma methods of Di
Residual error
Standard deviation
If single residual error along dynamic spectrum is greater than 3 σ, promptly | v
i|＞3 σ, think to include gross error in this dynamic spectrum, should remove contain gross error list along dynamic spectrum; Otherwise, when | v
i|≤3 σ, thinking does not have gross error in the dynamic spectrum, and with the dynamic spectrum output that all lists obtain along the dynamic spectrum superposed average, flow process finishes.
The least-square fitting approach that is applied in the embodiment of the invention method, 3 σ criterions are the known technology in the data processing method, and engineers and technicians are known for this area.
In sum, it is a kind of based on single method for processing dynamic spectral data along extraction that the embodiment of the invention provides, this method has compared with prior art at first been utilized the average effect of each wavelength in the single pulse cycle, rejects the unstable error of introducing of each wavelength light Power Capacity pulse waveform; Secondly utilized the list of different pulse cycle correspondences to delete again and wherein contained the list of gross error along dynamic spectrum along the average effect of dynamic spectrum, made full use of the photoelectricity pulse volume wave datum that collects, improved the accuracy of photoelectricity volume pulse waveform in each wavelength and each cycle, improve the signal to noise ratio of dynamic spectrum effectively, thereby improved the precision that detects based on dynamic spectrum method noinvasive blood constituent.
It will be appreciated by those skilled in the art that accompanying drawing is the sketch map of a preferred embodiment, the invention described above embodiment sequence number is not represented the quality of embodiment just to description.The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a method for processing dynamic spectral data that extracts based on single edge is characterized in that, said method comprising the steps of:
(1) obtains all band photoelectricity volume pulsation wave, utilize described all band photoelectricity volume pulsation wave to constitute all band photoelectricity volume pulsation wave template, and proofread and correct each wavelength light Power Capacity pulse waveform with this, eliminate the unstable error of introducing of each wavelength light Power Capacity pulse waveform;
(2) according to 3 σ criterions, the list that utilizes each pulse cycle forward position and tailing edge correspondence along the average effect of dynamic spectrum remove contain gross error list along dynamic spectrum, will remove the dynamic spectrum output that remaining list obtains along the dynamic spectrum superposed average after the gross error.
2. method according to claim 1, it is characterized in that, obtain all band photoelectricity volume pulsation wave described in the step (1), utilize described all band photoelectricity volume pulsation wave to obtain all band photoelectricity volume pulsation wave template, and proofread and correct each wavelength light Power Capacity pulse waveform with this, eliminate the unstable error of introducing of each wavelength light Power Capacity pulse waveform, specifically comprise:
Gather all band photoelectricity volume pulsation wave of detected part;
To described photoelectricity volume pulsation wave take the logarithm, superposed average, obtain all band photoelectricity volume pulsation wave template;
Described all band photoelectricity volume pulsation wave template is carried out segmentation and removed baseline and handle and obtain photoelectricity volume pulsation wave forward position template and tailing edge template;
Forward position and tailing edge waveform according to described each photoelectricity volume pulsation wave forward position template and the corresponding photoelectricity volume pulsation wave of tailing edge template calibration all wavelengths;
Obtain the ratio of each wavelength light Power Capacity pulse wave and photoelectricity volume pulsation wave forward position template and tailing edge template by least square fitting, described ratio is as the dynamic spectrum output on each edge.
3. method according to claim 1, it is characterized in that, described in the step (2) according to 3 σ criterions, the list that utilizes each pulse cycle forward position and tailing edge correspondence is removed along the average effect of dynamic spectrum and is contained the list of gross error along dynamic spectrum, remaining list after removing gross error along the dynamic spectrum output that the dynamic spectrum superposed average obtains, is specifically comprised:
The wavelength ordering is pressed with the ratio of described corresponding photoelectricity volume pulsation wave forward position template and tailing edge template in described each photoelectricity volume pulsation wave forward position and tailing edge, carry out normalized, obtain single along dynamic spectrum;
With all described lists along dynamic spectrum superposed average template as the dynamic spectrum of measuring;
Obtain the similarity degree of described list with Euclidean distance along dynamic spectrum and superposed average template;
In the measuring process of dynamic spectrum, according to 3 σ criterions, judge whether each list exists gross error along dynamic spectrum, if, removal contains the list of gross error along dynamic spectrum, until not existing the list that contains gross error till the dynamic spectrum, the dynamic spectrum output that remaining list is obtained along the dynamic spectrum superposed average; If not, with the dynamic spectrum output that all lists obtain along the dynamic spectrum superposed average, flow process finishes.
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| CN102389313A (en) * | 2011-08-17 | 2012-03-28 | 天津大学 | Device and method for measuring square wave modulated photoelectric volume pulse wave |
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