Driver FatigueDetector · 2019-12-18 · driver fatigue is 100,000 per year. ......
Transcript of Driver FatigueDetector · 2019-12-18 · driver fatigue is 100,000 per year. ......
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1Department of Electrical and Computer Engineering
Preliminary Design Presentation
Driver Fatigue DetectorAdvisor: Professor PouraghilyMember: Jiong Wang
Hongyu BaYachen Liu
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2Department of Electrical and Computer Engineering
Team Members
Hongyu Ba Jiong Wang(leader) Yachen LiuHardware Hardware software
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3Department of Electrical and Computer Engineering
Contents
• Problem statement
• Feasibility analysis
• Design alternative
• Team roles and schedule
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4Department of Electrical and Computer Engineering
How significant is the problem?
• In China, The number of traffic accidents caused by driver fatigue is 100,000 per year.
• 71,000 people are injured in accidents by driver fatigue in China
• Worldwide, In the freight industry, 57% of fatal truck traffic accidents are due to driver fatigue.
Problem statement
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5Department of Electrical and Computer Engineering
The disadvantages of current products
• Mercedes-Benz:The "Blink Monitoring" systemØ driver's blink frequency and the duration of each closed eye.Ø only has a fatigue driving monitor for more than two million.
• “SMART EYE” Company in SwedenØ eye detection and facial expression detection.Ø multiple cameras
Problem statement
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6Department of Electrical and Computer Engineering
Problem statement
The aims of our design
• Non-invasive
• Continuous
• Real-time
• Accurate
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7Department of Electrical and Computer Engineering
Deoxyhemoglobin
Oxyhemoglobin
Activity/oxidation reaction
• Normally, the blood oxygen content maintains a relative dynamic balance.
breath/Oxygen supply
Feasibility Analysis
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• Biology:Fatigue state The ability of HbR to bind the oxygen↓The activity needs to kept going The content of HbR ↑ and the content of HbO ↓.
Feasibility Analysis
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• Clinical Medicine:Blood oxygen content < normal value The content of HbR ↑ and the content of HbO ↓ Main symptoms : fatigue, drowsiness and lethargy.
Feasibility Analysis
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• The content of HbR and HbO in the blood can reflect the physiological state of the human body.
• the change of the two can be used to understand the activity level of the human body.
Feasibility Analysis
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11Department of Electrical and Computer Engineering
Feasibility Analysis
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12Department of Electrical and Computer Engineering
“Gold standard" for fatigue monitoring.
Feasibility Analysis
Reference:Zengyong L .Assessment of cerebral oxygenation during prolonged simulated driving using near infrared spectroscopy: its implicationsfor fatigue development Eur J Appl (2009) 107:281–287
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• FNIRS (Functional Near Infrared Spectroscopy)
Ø Jobsis in 1977 demonstrated NIRS could detect the oxygen changes in blood
Ø HbR , HbO in the blood and theirtotal blood volume have three absorption peaks at 735 nm , 850 nm and 805nm respectively.
Reference:Jöbsis, F.F.(1977) Noninvasive, Infrared Monitoring of Cerebral and Myocardial Oxygen Sufficiency and Circulatory Parameters. Science, 198, 1264-1267.
Principle
Feasibility Analysis
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14Department of Electrical and Computer Engineering
PrinciplePhotoelectric Effect
This change in the electrical properties of the object due to the illumination of light is the photoelectric effect.
Ø the object emits electrons, Ø or changes the electrical conductivity of the object, Ø or causes the object to generate a photoelectromotive force.
Feasibility Analysis
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• Two significant parameters: Ø Responding speedØ Sensitivity
Photoelectric Sensors
Feasibility Analysis
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Multiple Photoelectric SensorsTypes Responding
speedSensitivity
Siliconphotodiode
Medium (10KHz) low
Avalanchephotodiode
Fast (>100MHz) High
Photomultipliertube(*)
Fast (>100MHz) high
Charge-coupleddevice
Slow (1KHz) medium
Feasibility Analysis
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17Department of Electrical and Computer Engineering
Design Alternatives
Capsules of the Cerebral Cortex
ARM FPGA
Alarm System
BuzzerPower Supply Unit
Light Controller Data Processing and Calculation
Light Source Driving Module
Near Infrared Source
A/D Conversion Module
Photoelectric Sensor
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18Department of Electrical and Computer Engineering
Reflected Light Signal
Electric Signal1
Electric Signal2
DigitalSignal
Emitted Light Signal
Brain to be Tested
Photosensitive Detector
Signal Processing Module
Analog to Digital Conversion Module
Design Alternatives
Signal Conversion Process
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19Department of Electrical and Computer Engineering
Design Alternatives
• DE1-SoC• HardwareØ FPGA -- Dealing with Data and
CalculationØ ARM -- Control Module• AlgorithmØ Light Source Driving AlgorithmØ Data operation Algorithm
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Hardware• LEDsØ 735nm -- HbRØ 850nm – HbOØ 805nm -- blood volumn• Light Source Driver chipØ Driving three LEDs with different wavelength
Design Alternatives
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Design Alternatives
Hardware• Photoelectric sensorØ Convert optical signals into analog signals
• A/D converterØ Convert analog signals into digital signals
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Feasibility Analysis
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Buget
Infrared Sources:50$ * 3 =150$AD Convertor : 70$Photoelectric Sensor :70$Driver chips : 30$Others : 150$Total : 470$
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24Department of Electrical and Computer Engineering
Fatigue Driving Detector
Thank you!Questions?