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Physiological signal(Bio-signals)
Method, Application, Proposal
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Bio-Signals
1. Electrical signals
• ECG,EMG,EEG etc
2. Non-electrical signals
• Breathing, pH, movement etc
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General Procedure of bio-signal recognition system
Sensing
Preprocessing
Feature Extraction
Classification
Application
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Preprocessing
• Purpose: Eliminate common noises such as inherent equipment noise
• However, signals may be hindered by moving artifacts
• Filters are required!
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Case Study• Removing high f noise in ECG signal for disease
diagnosis• Implementation
1.Extract a single cycle of ECG 2.Set cut-off frequency, sampling frequency. Fs>2fc3.Define the filter function and apply to signal4.Calculate the SNR value SNR (dB) = 10 log (signal power)/(noise power) 5.View the ECG waveform
Reference: COMPARISON OF VARIOUS FILTERING TECHNIQUES USED FOR REMOVING HIGH FREQUENCY
NOISE IN ECG SIGNAL ,Priya Krishnamurthy1, N.Swethaanjali2, M.Arthi Bala Lakshmi3 ,2015
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Result
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Cognitive State
• Emotion Recognition
• Music
Digital Age• Gaming
• Digital Hand
Healthcare
• Disease detection
• Rehabilitation
• Brain and Body computer interface
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Emotion Recognition
• Six emotions
• Extract characteristic parameters from EMG, RV,SKT,SKC,BVP,HR
• Classification by SVM
• 85% in general recognition
Reference:Emotion recognition from physiological signals,K. GOUIZI, F. BEREKSI REGUIG & C. MAAOUI,2011
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Gaming: Baseball
• Eye movement feature of 9 directions
• EEG, EOG signal processing algorithms
Gaming Controlling via Brain-Computer Interface Using Multiple Physiological Signals, 2014
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Digital Hand
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Pattern recognition of number gestures based on a wireless surface
EMG system
• Xun Chen, Jane Wang
• Biomedical Signal Processing and Control
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Motion Detection of Surface EMG
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Features
• Hudgins’ time domain features.
• Autocorrelation and cross-correlation coefficients
• Spectral power magnitudes
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Classifications
• k-Nearest neighbor
• Linear discriminant analysis
• Quadratic discriminant analysis
• Support vector machine
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Feature Combining
• Combine the three feature with multi kernel leaning improves results further to 97.93 percent in offline case
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On-line experiment
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Summary
• Machine learning technique is relatively easy to perform quite well
• The training and testing subjects need to be the same (or else there is a domain adaptation problem)
• The performance between different testing subjects are large, some recognition rate for some numbers for some subjects are lower than 80 percent.
• Mentioned in the paper, the reasonable electrode placement helps a lot to achieve a great performance
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EMG-based Hand Gesture Recognition for Realtime Biosignal
Interfacing Jonghwa
Kim, Stephan Mastnik, Elisabeth André Lehrstuhl für Multimedia Konzepte und ihre Anwendungen Eichleitnerstr. 30, D-
86159 Augsburg, Germany
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Keywords
• Biosignal Analysis
• Electromyogram
• Human-Computer Interaction (HCI)
• Gesture Recognition
• Neural Interfacing
• Remote Control car
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Gesture Selection
• The hand should be situated in a posture
called the home position.
• Test over 20 different gestures.
• Select 4 gestures: Press, Left, Right, Circling
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System Structure
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Signal Acquisition
• NeXus-10™ with Myoscan-Pro™ EMG sensor
• EMG signals of up to 1600 µV in an active range of 20 to 500Hz
• Each pair of electrodes is used to examine mainly one single muscle.
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Preprocessing & Pattern Extraction
• A simple detrending function:
• An incoming preprocessed value was marked as the beginning of a pattern if a certain defined threshold value was reached.
• The detection of a pattern ending in the system were achieved by observing the root mean square (RMS) of the last 16 incoming values.
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Feature Extraction & Calibration
• maximum, minimum, mean value, variance, signal length and root mean square, fundamental frequency (FFT), Fourier variance, positions of the maximum and the minimum, zerocross, number of occurences
• For Calibration, We recorded 10 or 20 samples of each gesture per user.
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Classification
• kNN
• Bayes
• Combination 1
• Combination 2
• 40 test sets
• Each subject, we recorded 20 training samples and 20 test samples.
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Result
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Result
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Our Project
• Quad-copter
• Gesture Recognition
• Electromyogram
• Biosignal Analysis
• Computer Vision
• Machine Learning
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Reference
• http://www.tandfonline.com/doi/pdf/10.3109/03091902.2011.601784
• http://scholarbank.nus.edu.sg/bitstream/handle/10635/19070/ZhaoWEI.pdf?sequence=1
• http://www.giapjournals.com/index.php/ijsrtm/article/view/142/136