face recognition
DESCRIPTION
FACE RECOGNITION. BY: TEAM 1 BILL BAKER NADINE BROWN RICK HENNINGS SHOBHANA MISRA SAURABH PETHE. FACE RECOGNITION. BIOMETRICS EVOLVING APPROACHES TO RECOGNIZING FACES: EIGENFACE TECHNOLOGY LOCAL FEATURE ANALYSIS NEURAL NETWORK TECHNOLOGY ADVANTAGES/DISADVANTAGES FUTURE. - PowerPoint PPT PresentationTRANSCRIPT
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FACE RECOGNITIONFACE RECOGNITION
BY:
TEAM 1BILL BAKERNADINE BROWNRICK HENNINGSSHOBHANA MISRASAURABH PETHE
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FACE RECOGNITIONFACE RECOGNITION
BIOMETRICS EVOLVING APPROACHES TO RECOGNIZING
FACES:– EIGENFACE TECHNOLOGY– LOCAL FEATURE ANALYSIS– NEURAL NETWORK TECHNOLOGY
ADVANTAGES/DISADVANTAGES FUTURE
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FACE RECOGNITION:FACE RECOGNITION: What is it ? What is it ?
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BIOMETRICSBIOMETRICS
Biometrics - digital analysis using cameras or scanners of biological characteristics such as facial structure, fingerprints and iris patterns to match profiles to databases of people
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WHY DO WE NEED IT ?WHY DO WE NEED IT ? Quick way to discover criminals Criminals can easily change their appearance Fake Id’s Risks are higher than ever:
– 9/11– Anthrax– Etc.
Old ways are outdated
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EIGENFACE TECHNOLOGYEIGENFACE TECHNOLOGY
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EIGENFACE TECHNOLOGYEIGENFACE TECHNOLOGY
BIOMETRIC SYSYEMS IN DEVELOPMENT FOR OVER 20 YEARS
FACE IMAGE CAPTURED VIA CAMERA AND PROCESSED USING AN ALGORITHM BASED ON PRINCIPLE COMPONENT ANALYSIS (PCA) WHICH TRANSLATES CHARACTERISTICS OF A FACE INTO A UNIQUIE SET OF NUMBERS (TEMPLATE)
FACE PRESENTED IN A FRONTAL VIEW WITH WIDE EXPRESSION CHANGE
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EIGENFACE TECHNOLOGYEIGENFACE TECHNOLOGY
A set of Eigenfaces - two-dimensional face-like arrangements of light and dark areas, as shown to the right, is made by combining all the pictures and looking at what is common to groups of individuals and where they differ most
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EIGENFACE TECHNOLOGYEIGENFACE TECHNOLOGY To identify a face, the program compares its Eigenface characteristics, which are
encoded into numbers called a template, with those in the database, selecting the faces whose templates match the target most closely, as shown to the right
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LOCAL FEATURE ANALYSISLOCAL FEATURE ANALYSIS
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LOCAL FEATURE ANALYSISLOCAL FEATURE ANALYSIS
Local feature analysis considers individual features. These features are the building blocks from which all facial images can be constructed.
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LOCAL FEATURE ANALYSISLOCAL FEATURE ANALYSIS
Local feature analysis selects features in each face that differ most from other faces such as, the nose, eyebrows, mouth and the areas where the curvature of the bones changes.
Features
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To determine someone's identity,
(a) the computer takes an image of that person and
(b) determines the pattern of points that make that individual differ most from other people. Then the system starts creating patterns,
(c) either randomly or
(d) based on the average Eigenface.
LOCAL FEATURE ANALYSISLOCAL FEATURE ANALYSIS
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(e) For each selection, the computer constructs a face image and compares it with the target face to be identified.
(f) New patterns are created until
(g) A facial image that matches with the target can be constructed. When a match is found, the
computer looks in its database for a matching pattern of a real person (h), as shown below.
LOCAL FEATURE ANALYSISLOCAL FEATURE ANALYSIS
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PERFORMANCE ISSUESPERFORMANCE ISSUES
From Eigenface Technology to Local Feature Analysis, the problems faced were same:
Images with complex backgrounds Poor lighting conditions Recognition accuracy.
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NEURAL NETWORK NEURAL NETWORK TECHNOLOGYTECHNOLOGY
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•Features from the entire face are extracted as visual contrast elements such as the eyes, side of the nose, mouth, eyebrows, cheek-line and others (Feature Extraction).
•The features are quantified, normalized and compressed into a template code.
NEURAL NETWORK NEURAL NETWORK TECHNOLOGYTECHNOLOGY
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ARTIFICIAL NEURAL NETWORK
Valid user/Invalid user?
2f
3f
4f
5f
6f
1f
7f
Feature Extraction
Features provided
to ANN
ANN technology gives computer systems an amazing capacity to actually learn from
input data.
Input Layer
Hidden Layer
Output Layer
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Since,the neural network learns from experience, it does a better job of accommodating varying lighting conditions and improves accuracy over any other method.
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ADVANTAGES
DISADVANTAGES
Advantages
Less intrusive
Major security boost
Fast
Simple Recognition
Disadvantages
Breach of privacy
Comparatively less accurate
Expensive to implement
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BIOMETRIC SYSTEMS INTEGRATION SERVICES WHICH COMBINE FACE RECOGNITION SOFTWARE WITH OTHER BIOMETRICS, SUCH AS IRIS, VOICE, SIGNITURE, FINGERPRINT AS WELL AS EXISTING IDENTIFICATION CARD SYSTEMS
A PERSONS FACE WILL BE THE PRIVATE, SECURE AND CONVENIENT PASSWORD
BIOMETRICS FUTUREBIOMETRICS FUTURE ADVANCESADVANCES