Pusat Pengajian Kejuruteraaan Elektrik dan Elektronik - Monograf
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Browsing Pusat Pengajian Kejuruteraaan Elektrik dan Elektronik - Monograf by Type "master thesis"
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- PublicationFinger Vein Recognition Using Pattern Map As Feature Extraction(2012-11)Teoh, Saw BengToday, finger vein has become a new biometric technology. The challenge of finger vein recognition comes to during the process of feature extraction. Since the low contrast finger vein images may contain shading and noise, it is important to precisely preprocess, extract and preserve the vein patterns. Algorithms such as Gabor Filter, Local Line Binary Pattern (LLBP) and Principal Component Analysis (PCA) have been proposed in recent study to extract finger vein features. In this thesis, a modified pattern map feature extraction method is proposed for finger vein recognition. Instead of obtaining fmger vein features from multi-filtered images, the features images are generated from pattern templates which are the eigenveins obtained from PCA process. Every fmger vein image is then transformed into pattern map images from a pattern matching process between an input finger vein image and the pattern templates. Finally, nearest neighbour classifier with Euclidean distance metrics is used for classification. The main contribution of this thesis is the new way of generating pattern templates, which selects small blocks from every class within an area of constraint. Additionally, pattern map is implemented in finger vein recognition for the first time. Experimental results show that the proposed pattern map algorithm has better performance with a consistent identification rate of 99% and above compared to existing methods such as PCA and Gabor with FVCode. This shows that pattern map is a reliable feature extraction method and is able to represent finger vein pattern effectively.
- PublicationObserver Design For Underwater Glider(2014-07)Oo, Fhong HaoUnderwater gliders have numerous advantages over the conventional underwater vehicles in oceanographic applications. Gliders offered long duration and long range missions with low energy consumption. Internal actuation design protected actuators from ocean environment and have higher durability. Autonomous control strategies and path planning have been proposed by researchers. Controller for glider system required information from the system sensed outputs to perform closed-loop system. However some of the system states are difficult and unable to be measured during underwater and they are needed to be estimated. Presently the glider states estimation are based on assumption of constant angle of attack, pitch angle and so on. But this states estimation technique is lack of accuracy. To overcome this, linear observer has been proposed to estimate the unmeasured states and improved the estimation accuracy. However the states estimation by linear observer is only accurate for observation on linear model with motion close to equilibrium glide. For states estimation on nonlinear dynamic and all glide path aspect, nonlinear glider model based observer design is desired.