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Title: | 基於盲訊分離與離散小波轉換之抑制PPG上雜訊的方法 Blind Source Separation Based Method with DWT for Artifact Suppression in PPG Signals |
Authors: | Wen-Ting Liao 廖文廷 |
Advisor: | 呂學士 |
Keyword: | 盲訊號分離演算法,獨立成分分析法,平穩子空間分析法,離散小波轉換,光體積變化描述圖, BSS,ICA,SSA,PPG, |
Publication Year : | 2017 |
Degree: | 碩士 |
Abstract: | 穿戴式裝置於醫療上的應用已被廣泛的應用在臨床醫療及居家照護上,而光體積變化描述圖(PPG)在於即時監控生理資訊(心律、血氧)上,有量測簡易以及成本低的優點,而被大量的探討與研究。然而量測時,因為外在的因素而容易受到干擾(artifact)。為了精確地獲得光體積變化描述圖(PPG)中隱含的生理資訊,本論文提出了基於離散小波轉換與盲訊號分離的演算法來達到干擾(artifact)抑制的處理方法。其中盲訊號分離的演算法利用了獨立成分分析法(ICA)以及平穩子空間分析法(SSA)。最後實驗結果利用峰對峰間距之平均錯誤百分比、峰對峰間距之平均絕對誤差、峰對峰間距之皮爾生相關係數、峰對峰間距之布蘭德-奧特曼差異圖、峰對峰值之平均值、峰對峰值之標準差來做評估。最後結果顯示對受到干擾(artifact)的部分達到了抑制的效果。 Wearable devices in medical applications has been widely used in clinical care and home care. For the use of real-time monitoring for physiological information (heart rhythm, blood oxygen), photoplethysmogram(PPG) has the advantage of easy measurement and low cost. Thus, it has been a lot of discussions and researches. However, while measuring, it is vulnerable to the external interference and thus cause the artifact contamination. In order to accurately obtain the physiological information implied in the photoplethysmogram (PPG), we propose a method to deal with the artifact suppression based on the algorithm of discrete wavelet transform and blind source separation in this thesis. The algorithm for the separation of blind source uses independent component analysis (ICA) and stationary subspace analysis (SSA). In the final results of the experiment, we use the average error percentage of the peak-to-peak spacing, the average absolute error of the peak-to-peak spacing, the Pearson correlation coefficient of the peak-to-peak spacing, the Bland-Altman difference plot of the peak-to-peak spacing, the average of the peak to the peak values, the standard deviation of the peak to the peak values to do the assessment. The final result shows that the proposed methods have the effect of artifact suppression. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/20553 |
DOI: | 10.6342/NTU201702887 |
Fulltext Rights: | 未授權 |
Appears in Collections: | 電子工程學研究所 |
Files in This Item:
File | Size | Format | |
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ntu-106-1.pdf Restricted Access | 2.54 MB | Adobe PDF |
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