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A NEURAL ADABOOST BASED FACIAL
EXPRESSION RECOGNITION SYSTEM
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BIRD EYE VIEW ABOUT THIS PAPER
Object Detection Framework(Viola-Jones Descriptor)
Down Sampled by Bessel Transform
Gabor Featrue Extraction Technique employed
Select numerous features using AdaBoost hypothesis
Neural Network Backpropogation algorithm use for
classification.
Tested on JAFEE and Yale Facial Expression
Database
Avergae Recogniton Rate is 96.83% and
92.2%.
Execution time for 100 Х 100 pixel is 14.5ms
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THE PAPER Title: A neural AdaBoost based facial
expresson recognition system
By: E.Owusu, Y. Zhan, Qi Rong Mao
From: Jiangsu University, China
Year: 2014
Citations: 12
Published: Expert System With Applications
Reference: http://www.sciencedirect.com/science/article/pii/S0957417413009615
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INTRODUCTION Facial expression involves application of AI.
It is related to Patten recognition and computer vision
Facial expression are seven prototypical ones, namely Anger, fear, surprise, sad, disgust, happy, neutral
This technology is applied in various fields like robotics, mobile applications, digital signs e.g. AIBO Robot Biologically inspired robots Some robots can display happiness feeling when detect face.
Databses: JAFFEE and Yale
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SOME PREVIOUS WORKYear Feature
ReductionFeature
ExtractionClassification Performance
2001 PCA FFNN 84.5%
2012 PCA GFE NN 60-70%
2012 AMI FFNN 93.8%
2007 Sobel Filter Elmon N/W 84.7%
2009 PCA GFE NN 93.4%
In Most of the Studies: Expression Classifier: Neural Network Extracted Features: Gabor Filter Feature Reduced: PCA
Displeasing is that the result is not encouragable.
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PROPOSED TECHNIQUE Data reduced by Bessel Transformation.
Extraction of the face by Gabor Methods
Feature Reduced by AdaBoost Feature Reduction Technique
Facial Expression Recognition using Bessel down Sampling
Classifier is Multi layer feed forward neural network using backpropogation
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HOW PROPOSED TECHNIQUE WORKS
Face detection and image down-sampling
Gabor feature extraction
Feature selection
Multilayer feed forward neural network(MFNN)
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FACE DETECTION AND DOWN-SAMPLING
Face Detection component was implemented by Viola Jones.
Image is rescaled to 20 * 20px by Bessel Down Sampling.
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GABOR FEATURE EXTRACTION
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FEATURE SELECTION
Selection Algorithm Initialize Sample Distribution For the iteration t = 1, 2,..., T, where T is the final
iteration Normalize the Weight Train a weak Clasifier Select the hypothesis Compute the weight Update the weight distribution
Final Selection feature Hypothesis
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MULTILAYER FEED-FORWARD NEURAL NETWORK (MFFNN) CLASSIFIER
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TRAINING ALGORITHM
Process of Training Involves Weight Initilization Calculation of Activatin Function Weight Adjustment Weight Adaption Testing for Convergence of N/W
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TRAINING ALGORITHM Training Algorithm Modeled as:
Activation Funciton of Hidden Units:
Activation Function of Output Units:
Network Error Function
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HOW TO MINIMIZE THE ERROR
To minimize the error, each weight in the network need to be computed.
Previous Weight Changes:
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WEIGHT UPDATTION
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RESULT ON JAFFEE
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RESULT ON YALE
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GRAPHICAL REPRESENTATION (JAFEE)
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GRAPHICAL REPRESENTATION (YALE)
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COMPARATIVE RESULTS(JAFEE)
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COMPARATIVE RESULTS(YALE)
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CONCLUSION
This study employs advance techniques Improve recognition rate and execution time Study Involves
Face Detection: Viola Jones Descriptor Down Sampled: Bessel Transform Extracted Feature: AdaBoost Algorithm Select Feature: Gabour Wavelets
Selected Feature fed into MFFNN Classifier Network trained by sample database JAFEE
and Yale
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EXECUTION TIME AND RECOGNITION RATE OF PROPOSED METHOD
Previous Performance The execution time for a pixel of size 100 x 100
is 14.5 ms; the average recognition rate in JAFFE database is 96.83% and that in Yale is 92.22%.
Proposed Method Study shows that
Automatic expression recognitions are very accurate in surprise, disgusts and happy about 100%.
Mild expressions like sad, fear and neutral have lower accuracies.