CHAPTER 4 FACE RECOGNITION DESIGN AND ANALYSIS
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1 CHAPTER 4 FACE RECOGNITION DESIGN AND ANALYSIS As explained previously in the scope, this thesis will also create a prototype about face recognition system. The face recognition system itself has several modules that are working together as one to make the system runs smoothly. However, the prototype will not cover all of the modules. The prototype will only cover until the face detection module. The sub-chapters below are the general design for face recognition system. Instead of the face recognition system design, I will also give some explanation on how the prototype is built. 4.1 General Phases in Face Recognition There are five general phases in face recognition system. The system must execute all the phase before finally get into the expected result. The phases are [29]: 1. Capture image 2. Detect faces in the image 3. Feature Extraction
2 46 4. Template comparison 5. Declaration of matching template Figure 13 - Facial recognition steps [29] Image Capturing The acquisition of face images can be done by digitally scanning an existing photograph or by using an electro-optical camera. While to capture a real-time situation like in public place, the acquisition can be accomplished by using CCVT camera or any surveillance camera.
3 47 Figure 14 - CCTV camera and Surveillance Camera Furthermore, the acquisition of the prototype can be done by using webcamera or manually input the desired image into the prototype system. Figure 15 - Web Camera
4 Face Detection The function of this module is to determine where in an image a face is located. The face detection module works by scanning up an image at different scales and looking for some simple patterns that denote the presence of a face. After the system detected a face, it will then produce a sub-image (image chip) that is scaled such that the face appears in the centre and presented at a uniform size. OpenCV already provide algorithm to locate faces in still images and videos. It is called the Haar-based Cascade Classifier or simply known as Haar Classifier. [30] This algorithm scans and image and create a bounding box as a returns for each detected face.
5 49 Figure 16 - Haar Classifier Result Example The square bounding boxes indicate the detected faces in the image. It is actually the result of the Haar Classifier. The code snipped above is the way how to declare the Haar Classifier and load it to be used afterwards. [31]
6 Feature Extraction Another phase in face recognition is feature extraction. This is a phase where the system does the localizing of the characteristics of face components (i.e. eyes, mouth, nose, etc) in an image. In other words, feature extraction is a step in face recognition where the system locates certain points on the face such as the corner and centre of the eyes, tip of the nose, mouth, etc. It analyze spatial geometry of differentiate feature of a face. The result of this analyzing is a set of template generated for each face. The template consists of a reduced set of data that represent the uniqueness of the enrolled face features. There are two algorithms that can be used for this module, such as: 1. PCA (Principal Component Analysis) [13] PCA represents the face images as vectors where each vector elements relate to a pixel value in the image. PCA is the most popular algorithm to use. It can be combined with other neural networks and local feature analysis to enhance its performance. Figure 17 - PCA example
7 51 PCA compares the resulted template with the template images stored in the database and find the closest matching image. 2. EBGM (Elastic Bunch Graph Matching) [17] This is another algorithm to extract the face features. The EBGM algorithm operates in three phases. First, important landmarks on the face are located by comparing Gabor jets extracted from the new image to Gabor jets taken from training imagery. Second, each face image is processed into a smaller description of that face called a FaceGraph. The last phase computes the similarity between many FaceGraphs by computing the similarity of the Gabor jet features. [bolme]
8 52 Figure 18 - The Basic Steps of EBGM Template Comparison The fourth phase of face recognition is to compare the templates generated in previous phase with the template in the database (enrolled templates). [29] There are two ways of comparing the templates based on
9 53 the purpose of the application itself. In identification application the template match all templates in the database and get the closest match (1 : N). While in verification application, the generated template will only be compared to one data entry in the database that is the claimed identity (1 : 1) Declare Matches The final phase of face recognition is to declare the highest matching score resulted in the previous step. [29] The ground rules applied to the application to declare the strictness of the application are based on the configuration set up by the end users. The configuration will determine how the application should behave based on the desired security and operational consideration. 4.2 Face Recognition Application Design The face recognition application used in this thesis is a free download-able version provided by Neurotechnology, called VeriLook Face Identification Technology. This company provides algorithm and software development product for biometrics (fingerprint and face recognition) system, computer vision based system, and object recognition. [32]
10 54 This application is able to capture image using cameras (web-cam) as its external video source and also to read captured image from external file (png, bmp, jpg, tif, and gif). There are two types of execution modes that the application has, such as: 1. Enrolment The enrolment mode happens when the users register their face images. The system will then check whether there is a face in it or not and do the feature extraction. After that the extraction result will be wrote into the template database. 2. Matching This mode performs the algorithm to match the new acquired face with the enrolled face images in the template database.
11 Data Flow Diagram 1.0 Image Capturing Enroll User 2.0 Face Detection Stored Face Images Database Load 3.0 Feature Extraction 4.0 Template Comparison 5.0 Declare Matches Figure 19 - Data Flow Diagram of Face Recognition System
12 Flowchart Figure 20 - Flowchart of face recognition system
13 57 The face recognition implementation is mainly divided into two sub tasks. The first one is face enrolling and the second one is the face recognition system itself. 1. Face Enrolling Face enrolling happens when a candidate or recognition subject first use the system. Enrolling their face image means the system will take their picture using the installed camera. Next, the system will then automatically detect the subject s face and extract the image using preferred algorithm (PCA or EBGM). It will then produce a template image and it will be stored into the face database. 2. Face Recognition Face recognition system works when the subject already enrolled their face image into the system. Then, the system will also capture the subject s face through the camera, detect the face, and apply the feature extraction functions on it to get the template. Next, the new generated template will be compared to the enrolled template in the database. 4.3 Prototype Design As it has been told previously, the prototype will be covered the image acquisition and face detection phases only.
14 Image Acquisition Image acquisition is the first step that has to be done in this prototype. The prototype will use a Logitech web-cam as the hardware. Figure 21 - Logitech webcam for Notebook OpenCV library provides function to capture image from specified camera. I use the provided function to capture image from the webcam, thus the prototype will be captured a real-time image.
15 Face Detection To be able to detect faces from the captured image is the main purpose of this prototype. As written previously in this chapter, face detection determines where in an image a face is located. The face detection works by scanning up an image at different scales and looking for some simple patterns that identify the presence of a face. The prototype is built using the Haar-like Features (Haar Classifier) function from OpenCV. Haar classifier detection is done by creating a search window that slide through the image and check whether a certain region of an image looks like a face or not. It quickly discards the other part of an image that is not detected as a face. The basic of this method are the haar-like features and a large set of very simple weak classifier that use a single feature to define a certain image region as face or non face. Each feature is described by the template (shape of the feature), its coordinate relative to the search window origin and the size (scale factor) of the feature. [34]
16 60 Figure 22 - Haar-like features Figure 23 - Search window
17 61 The search window quickly scanning the first classifier on the cascade, if the classifier returns false then the computation on that window also ends and results no detected face (false). Moreover, if the classifier returns true, then the window will be passed down to the next classifier in the cascade to do the exact same thing. When all classifier returns true for that window, then the result will returns true also for that certain window (face detected). Figure 24 - Decision tree based on haar-like features (cascade of classifiers) The more a window looks like a face, the more the classifiers to be computed and the longer it takes to classify that window. Thus, if the
18 62 window is not a face the classifier will quickly reject it after considering only a small fraction of features in it. Figure 25 - Removal concept in cascade classifier
19 Design Diagram Data Flow Diagram 1.0 Image Capturing Enroll User 2.0 Face Detection 3.0 Display detected face by creating bounding box Figure 26 - Prototype data flow diagram
20 Simple Haar Classifier Flow Diagram Input image Sum pixel calculation Rectangular node selection Haar-like features calculation Haar-like feature in database scalling Haar-like features comparisson Face Detection Figure 27 - Haar-like features flow diagram
21 Flowchart start Image acquisition Haar classifier image calculation process No Face detected? yes Display detected face using bounding box Finish Figure 28 - Face detection flowchart
22 Data Dictionary Data Flow Diagram (DFD) Data Dictionary Symbol Description A process is an activity or function performed for a specific reason. Used to represent the thing done by the system. A data store is an inventory of data, database. External Agent An external agent defines a person, organizational unit, or other organization lies outside of the scope of the project but interacts with the system. A data flow represents an input of data to a process, or the output of data from a process. The data flow may also be used to represent the creation, reading, deletion, or updating of data in a data store. Table 5 - DFD Data Dictionary
23 System Flow Chart Data Dictionary Symbol Description A terminal that tells where the flowchart begins and ends. It shows the entry point of the flowchart and the exit point. Arrows determine the flow (sequence) through the chart. Shows a process, task, action, or operation. It shows something that has to be done or an action that has to be taken. A decision asks a question. The answer to the question determines which arrow you follow out of the decision shape. A parallelogram used to show input or output. Examples of input are receiving information from the patient table and receiving data from the doctor database. Table 6 - System Flowchart Data Dictionary 4.6 System Solution System solution is basically the list of tools needed to develop the prototype. It is divided into several types such as, implementation tools, development tools, and hardware and software requirements.
24 Implementation Tools Implementation tool is basically the programming language that is used in order to build the prototype. The prototype will be built under C++ programming language. C++ is a middle-level language because it contains a combination of both high-level and low-level language features. Besides C++ as the basic programming language, the prototype will also use OpenCV as a library of programming functions that can be used mainly to build a real-time computer vision. In this prototype, the OpenCV library will be used to enhancing the image processing process Development Tools Development tool is the software used to build the prototype. 1. Microsoft Visual Studio 2008 This software provides access to use C++ and its library. Moreover, the OpenCV library can also be used and included in this software. 2. Adobe Photoshop CS I use this software to edit the image (cropping) to get a better view of the image.
25 Hardware and Software Requirements Hardware requirement is the specification of the computer that is required to be able to run the system smoothly. The system will need a camera (web-cam), monitor, and a CPU with minimum specification as listed below: Operating System : Microsoft Windows XP Professional Processor : 1GHz 32-bit Memory : 128MB RAM Hard Disk Space : 10 GB Besides hardware, the system also needs some software as the requirements that need to be installed in the client s machine. Software required : Microsoft Visual Studio 2008 with OpenCV Library installed.
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