In Mobile Ad Hoc NETworks MANETs) autonomous nodes act both as traffic originators and forwarders to form a multi-hop network. Out-of-range nodes are reachable through a process called routing, which is a challenging task due to the constraints of bandwidth and battery power. Stateless location-based routing schemes have been proposed to avoid complex route discovery …
Category Archive: Computer Science
Computer Science Paper
Mar
13
Strategic targeting of outliers for expert review
In the era of massive data sets, it is difficult for domain scientists to interact directly with their own data. Because the analysis of single examples may yield insights in the research process, it is important to use automated methods to highlight potentially interesting phenomena when hand inspection is not possible. This dissertation examines a …
Mar
13
Robust video watermarking scheme in transform domains
Protection of digital multimedia content has become an increasingly important issue for content owners and service providers. Watermarking is the process of embedding data into a multimedia element such as image, audio, or video. The embedded data can later be extracted from, or detected in, the multimedia for security purposes. There are several open research …
Mar
13
Ark, the Metamodelling Kernel for Domain Specific Modelling
A model is an abstraction of the real system. To design complex systems, modelling is preferred to the traditional methods for its capability to analyse and simulate before implementation, and its tools for code generation which allows for defect-free code. The domain specific modelling and metamodels the abstraction of models) provide the modellers domain specific …
Mar
13
The visualization of uncertainty
The graphical depiction of uncertainty information is emerging as a problem of great importance in the field of visualization. Scientific data sets are not considered complete without indications of error, accuracy, or levels of confidence, and this information is often presented as charts and tables alongside visual representations of the data. Uncertainty measures are often …
Mar
13
Automated registration of two-dimensional images with three-dimensional range data in a photorealistic modeling system of urban scenes
The photorealistic modeling of large-scale scenes, such as urban structures, requires the combination of range sensing technology and 2D digital photography. In this thesis, we attack the key problem for this combination, the registration of 2D images with 3D range data, in a unique and efficient manner. A set of novel algorithms are developed and …
Mar
13
Distributed algorithms for efficient routing in computer communication networks
In this thesis, we discuss the design implications of compact routing algorithms on both wired and wireless networks. We begin by exploring algorithms for wireless ad-hoc networks that restrict control signaling in an effort to quantify and limit messaging complexity. We introduce Elliptic Demarcation of Information Transfer EDIT) as an approach to limit the signaling …
Mar
13
Statistical and geometric methods for passive-blind image forensics
Passive-blind image forensics (PBIF) refers to passive ways for evaluating image authenticity and detecting fake images. This dissertation proposes a physics-based approach for PBIF, with our definition of image authenticity derived from the image generative process comprising the 3D scene and the image acquisition device. We propose one statistical method and two geometric methods for …
Mar
13
Long-term information preservation and access
An unprecedented amount of information encompassing almost every facet of human activities across the world is generated daily in the form of zeros and ones, and that is often the only form in which such information is recorded. A good fraction of this information needs to be preserved for periods of time ranging from a …
Mar
13
Lightweight 3D modeling of urban buildings from range data
Laser range scanners are widely used to acquire accurate scene measurements. The massive point clouds they generate, however, present challenges to efficient modeling and visualization. State-of-the-art techniques for generating 3D models from voluminous range data is well-known to demand large computational and storage requirements. In this thesis, attention is directed to the modeling of urban …