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標題: 以心率變異度之頻域分析為基礎所實現的嵌入式瞌睡偵測系統
Embedded System Implementation of Drowsiness Detection Based on Frequency Domain Analysis of Heart Rate Variability
作者: 羅華義
Luo, Hua-I
關鍵字: 心率變異度;heart rate variability;瞌睡偵測系統;人機介面;心電訊號;功率頻譜密度;嵌入式系統;軟硬體橋接器;系統單晶片;drowsiness detection system;Cheetah development kit;graphical user interface;electrocardiography;power spectral density;embedded system;HW-SW Bridge;system on chip
出版社: 電機工程學系所
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一般的瞌睡的偵測法方可能使用點頭頻率或者眼部閉合的方法來判斷,但上述的方式通常是駕駛已經進入瞌睡狀態,因此無法在第一時間預防與警告駕駛人,本論文使用心率變異度(heart rate variability, HRV)在頻域上的分析來偵測駕駛人是否進入瞌睡狀態,此種方式有別於由外部擷取資訊來進行判斷,較能準確且即早的發現駕駛人是否已經進入短暫的睡眠狀態,有利於即早發出警告來防止交通意外的發生。

本論文提出的瞌睡偵測系統(drowsiness detection system)使用Cheetah development kit (CDK)來實現與驗證結果,在PC上發展出人機介面(graphical user interface, GUI),能即時的觀察到心電訊號(electrocardiography, ECG)的波形與心率變異度的功率頻譜密度(power spectral density, PSD)分析結果,本系統以嵌入式系統(embedded system)的方式實現,在硬體架構中加入軟硬體橋接器模組(HW-SW Bridge)讓擴充的硬體模組更容易整合到當前的系統中,以嵌入式系統的方式實現將有利於日後進行系統單晶片(system on chip, SOC)的發展與實現。

Vehicle penetration rate rapidly increases in the word. In recent years, car accidents caused by fatigued driving and drowsy driving are raised. Driving is spiritually exhausted types of work. There are several symptom of tired drowsy driving such as awkward movements, blurred vision, trance, unresponsive…etc.. While drowsy driving happens, it accompanies with short duration sleep and losing control of driving. Drowsy driving is usually happening during high-speed driving. If the driver doesn’t take a rest or keeps spirits up, drowsy driving might cause serious traffic accidents.

Generally, measuring the frequency of nod or close of eyes are the methods to judge the drowsiness state. However, the measuring information can only be gotten during drowsy condition. Hence, it is hard to measure drowsy information and to warn drowsy driver earlier. The thesis will use frequency domain analysis of heart rate variability (HRV) to detect if drowsiness state happens. This way is different than detect by external feature. It can early and exactly detect whether short duration sleep happens. It is a profitable way to prevent traffic accidents.

The thesis proposes a drowsiness detection system, which is implemented by Cheetah development kit (CDK) and uses graphical user interface (GUI) in PC. It can immediately display electrocardiography (ECG) waveform and power spectral density (PSD) analysis of heart rate variability. The system based on embedded system and hardware system added HW-SW Bridge that integrates easily for all system to promote system on chip (SOC) implementation in the future.
其他識別: U0005-2108201201320800
Appears in Collections:電機工程學系所

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