Genetic And Evolutionary Feature Selection And Weighting For Face Recognition

Investigated the hybridization of genetic-based feature selection (GEFeS), genetic-based feature weighting (GEFeW) and LBP-based face recognition techniques. The results indicate that feature selection and weighting enhances the overall performance of LBP-based face recognition techniques

Novel Approaches to Improve Iris Recognition System Performance Based on Local Quality Evaluation and Feature Fusion

For building a new iris template, this paper proposes a strategy to fuse different portions of iris based on machine learning method to evaluate local quality of iris. There are three novelties compared to previous work. Firstly, the normalized segmented iris is divided into multitracks and then each track is estimated individually to analyze the recognition accuracy rate (RAR). Secondly, six local quality evaluation parameters are adopted to analyze texture information of each track. Besides, particle swarm optimization (PSO) is employed to get the weights of these evaluation parameters and corresponding weighted coefficients of different tracks. Finally, all tracks’ information is fused according to the weights of different tracks. The experimental results based on subsets of three public and one private iris image databases demonstrate three contributions of this paper. (1) Our experimental results prove that partial iris image cannot completely replace the entire iris image for iris recognition system in several ways. (2) The proposed quality evaluation algorithm is a self-adaptive algorithm, and it can automatically optimize the parameters according to iris image samples’ own characteristics. (3) Our feature information fusion strategy can effectively improve the performance of iris recognition system

Adaptive noise reduction and code matching for IRIS pattern recognition system

Among all biometric modalities, iris is becoming more popular due to its high performance in recognizing or verifying individuals. Iris recognition has been used in numerous fields such as authentications at prisons, airports, banks and healthcare. Although iris recognition system has high accuracy with very low false acceptance rate, the system performance can still be affected by noise. Very low intensity value of eyelash pixels or high intensity values of eyelids and light reflection pixels cause inappropriate threshold values, and therefore, degrade the accuracy of system. To reduce the effects of noise and improve the accuracy of an iris recognition system, a robust algorithm consisting of two main components is proposed. First, an Adaptive Fuzzy Switching Noise Reduction (AFSNR) filter is proposed. This filter is able to reduce the effects of noise with different densities by employing fuzzy switching between adaptive median filter and filling method. Next, an Adaptive Weighted Shifting Hamming Distance (AWSHD) is proposed which improves the performance of iris code matching stage and level of decidability of the system. As a result, the proposed AFSNR filter with its adaptive window size successfully reduces the effects ofdifferent types of noise with different densities. By applying the proposed AWSHD, the distance corresponding to a genuine user is reduced, while the distance for impostors is increased. Consequently, the genuine user is more likely to be authenticated and the impostor is more likely to be rejected. Experimental results show that the proposed algorithm with genuine acceptance rate (GAR) of 99.98% and is accurate to enhance the performance of the iris recognition system

Genetic And Evolutionary Biometrics:Multiobjective, Multimodal, Feature Selection/Weighting For Tightly Coupled Periocular And Face Recognition

The Genetic & Evolutionary Computation (GEC) research community has seen the emergence of a new subarea, referred to as Genetic & Evolutionary Biometrics (GEB), as GECs have been applied to solve a variety of biometric problems. In this dissertation, we present three new GEB techniques for multibiometric recognition: Genetic & Evolutionary Feature Selection (GEFeS), Weighting (GEFeW), and Weighting/Selection (GEFeWS). Instead of selecting the most salient individual features, these techniques evolve subsets of the most salient combinations of features and/or weight features based on their discriminative ability in an effort to increase accuracy while decreasing the overall number of features needed for recognition. We also incorporate cross validation into our best performing technique in an attempt to evolve feature masks (FMs) that also generalize well to unseen subjects and we search the value preference space in an attempt to analyze its impact in respect to optimization and generalization. Our results show that by fusing the periocular biometric with the face, we can achieve higher recognition accuracies than using the two biometric modalities independently. Our results also show that our GEB techniques are able to achieve higher recognition rates than the baseline methods, while using significantly fewer features. In addition, by incorporating machine learning, we were able to create FMs that also generalize well to unseen subjects and use less than 50% of the extracted features. Finally, by searching the value preference space, we were able to determine which weights were most effective in terms of optimization and generalization

Development of an image converter of radical design

A long term investigation of thin film sensors, monolithic photo-field effect transistors, and epitaxially diffused phototransistors and photodiodes to meet requirements to produce acceptable all solid state, electronically scanned imaging system, led to the production of an advanced engineering model camera which employs a 200,000 element phototransistor array (organized in a matrix of 400 rows by 500 columns) to secure resolution comparable to commercial television. The full investigation is described for the period July 1962 through July 1972, and covers the following broad topics in detail: (1) sensor monoliths; (2) fabrication technology; (3) functional theory; (4) system methodology; and (5) deployment profile. A summary of the work and conclusions are given, along with extensive schematic diagrams of the final solid state imaging system product

Trajectories of care and changing relationships : the experiences of adults with acquired brain injuries and their families

This PhD thesis explores issues around acquired brain injury, focusing particularly on changing relationships between patients and carers and the trajectories they follow from the point of injury or diagnosis as a reconstructed life unfolds. Patients are identified as having strategies of adaptation and carers as taking on levels of agency, both of which shift according to time, context and other complex interactions. Each impacts on the other to produce an internal dynamic, the functionality of which is explored. Issues of care delivery are also raised, including the effects of mismatched expectations and of sharing or restricting information. This research is qualitative and based on the principles of grounded theory. 62 interviews were conducted involving 82 people (52 patients and 30 carers) and additional evidence was gathered from professional records, media reports and personal diaries. Themes were developed that can be linked together to form a trajectory of care, inside of which there is a finely balanced ecology. It is proposed that this trajectory although developed around data from people with brain injury is also applicable to other chronic conditions

Technology 2002: The Third National Technology Transfer Conference and Exposition, volume 2

Proceedings from symposia of the Technology 2002 Conference and Exposition, December 1-3, 1992, Baltimore, MD. Volume 2 features 60 papers presented during 30 concurrent sessions

Technology 2000, volume 1

The purpose of the conference was to increase awareness of existing NASA developed technologies that are available for immediate use in the development of new products and processes, and to lay the groundwork for the effective utilization of emerging technologies. There were sessions on the following: Computer technology and software engineering; Human factors engineering and life sciences; Information and data management; Material sciences; Manufacturing and fabrication technology; Power, energy, and control systems; Robotics; Sensors and measurement technology; Artificial intelligence; Environmental technology; Optics and communications; and Superconductivity

Securing Natural Gas: Entity-Attentive Security Research

Natural gas is a troublesome and ‘wayward’ material (Bridge, 2004; 396). Amongst other qualities, it is invisible, intangible, naturally odorless, highly inflammable, and constantly resistant to the forces that contain it. This thesis provides an account of how these qualities both introduce a series of insecurities to everyday social environments, and also make it a challenging material to govern. Specifically, I examine the way that security is performed around gas circulations in the UK’s transmission and distribution pipelines, and I describe how a range of specialized security practices have been developed according to the particular challenges that gas’s materiality presents. In developing this account, I make two claims. First, I argue that performances of security cannot be adequately understood without attending to the specific qualities of the circulating elements around which it is practiced. Here I build upon Dillon’s (1996) observation that security has tended to be treated as a noun that is independent of the elements that it is practiced in relation to. As a consequence, it has typically been framed as a broadly transferrable set of practices that can be more-or-less unproblematically applied to very different elements. I suggest that this abstraction has resulted in the further reduction of security into two broad practices: acts of circulatory filtration (in which risky elements are separated from flows of safe bodies, materials and things), and acts of circulatory maintenance (whereby security is performed by ensuring the continuity of particular circulations). It is my contention in this thesis that security scholars need to pay better attention to the ways in which the specific material qualities of circulating elements are generative of particular forms of securing practice. Indeed, by examining the way that security is performed around gas, I describe a series of practices that far exceed those described in accounts that present security as a matter of circulatory filtration or maintenance. My second claim is that the spaces and scales at which security is analyzed need to be expanded. I demonstrate how the critical security studies and energy security literatures have both tended to focus on security’s practice within particular nodes, at the exclusion of the performances of security (and forms of insecurity) that develop across the journeys of circulating elements; as they move between nodes. Indeed, I suggest that circulation has often been reduced in these accounts to thin, straight, and featureless lines that are largely inconsequential for performances of security. I seek to trouble this reduction, following gas as it travels through the UK gas transport infrastructures, tracing the various forms of (in)security that develop across these journeys. As a consequence of these two claims, security takes quite a different form in this account to its various depictions in the existing security literatures. I describe it as consisting of a series of ontological projects that are enacted across the lengths and breadths of gas’s circulations, and through which the material reality of natural gas is constantly (re)organised in attempts to facilitate, ‘compensate for’, and ‘cancel out’ particular kinds of perceived potential phenomena (Foucault, 2007; 36). Significantly, these performances are shown to be structured, or ‘programmed’ (Latour, 1991), through the coming together of multiple interests that pertain to a variety of heterogeneous actors and manifold referent objects. Different interests are shown to come together across gas’s journeys, and to undergo ongoing processes of negotiation that result in a variety of security performances, through which different imperatives are pursued. As such, I suggest that gas becomes ‘modulated’ (Deleuze, 1992) – it is constantly transformed from moment to moment, across the full duration of its circulatory journeys