Animating Virtual Human for Virtual Batik Modeling

This research paper describes a development of animating virtual human for virtual batik modeling project. The objectives of this project are to animate the virtual human, to map the cloth with the virtual human body, to present the batik cloth, and to evaluate the application in terms of realism of virtual human look, realism of virtual human movement, realism of 3D scene, application suitability, application usability, fashion suitability and user acceptance. The final goal is to accomplish an animated virtual human for virtual batik modeling. There are 3 essential phases which research and analysis (data collection of modeling and animating technique), development (model and animate virtual human, map cloth to body and add a music) and evaluation (evaluation of realism of virtual human look, realism of virtual human movement, realism of props, application suitability, application usability, fashion suitability and user acceptance). The result for application usability is the highest percentage which 90%. Result show that this application is useful to the people. In conclusion, this project has met the objective, which the realism is achieved by used a suitable technique for modeling and animating

Numerical modeling of pulsed eddy current techniques for detection of corrosion and cracks

In this thesis we study pulsed eddy current based techniques for characterizing both corrosion and cracks in layered metallic structures. Our primary goal is to understand and model the characteristic features of time-domain current-voltage response functions for characterizing corrosion and cracks. Pulsed eddy current based approach is simpler and faster than frequency domain approaches, and the pulsed eddy current equipment developed for defect detection is less expensive than alternative approaches and easily portable. We take the layer approximation theory for corrosion and the boundary integral method for cracks as the basis for computing the change in impedance of the coil and then compute the transient voltage-current response for step-function excitation of the coil. Considerable effort has been made to reduce the computational complexity of calculations of the change in impedance of the coil by using spline based interpolation

The use of computer-aided design techniques in dynamic graphical simulation

Imperial Users onl

Techniques for document image processing in compressed domain

The main objective for image compression is usually considered the minimization of storage space. However, as the need to frequently access images increases, it is becoming more important for people to process the compressed representation directly. In this work, the techniques that can be applied directly and efficiently to digital information encoded by a given compression algorithm are investigated. Lossless compression schemes and information processing algorithms for binary document images and text data are two closely related areas bridged together by the fast processing of coded data. The compressed domains, which have been addressed in this work, i.e., the ITU fax standards and JBIG standard, are two major schemes used for document compression. Based on ITU Group IV, a modified coding scheme, MG4, which explores the 2-dimensional correlation between scan lines, is developed. From the viewpoints of compression efficiency and processing flexibility of image operations, the MG4 coding principle and its feature-preserving behavior in the compressed domain are investigated and examined. Two popular coding schemes in the area of bi-level image compression, run-length and Group IV, are studied and compared with MG4 in the three aspects of compression complexity, compression ratio, and feasibility of compressed-domain algorithms. In particular, for the operations of connected component extraction, skew detection, and rotation, MG4 shows a significant speed advantage over conventional algorithms. Some useful techniques for processing the JBIG encoded images directly in the compressed domain, or concurrently while they are being decoded, are proposed and generalized; In the second part of this work, the possibility of facilitating image processing in the wavelet transform domain is investigated. The textured images can be distinguished from each other by examining their wavelet transforms. The basic idea is that highly textured regions can be segmented using feature vectors extracted from high frequency bands based on the observation that textured images have large energies in both high and middle frequencies while images in which the grey level varies smoothly are heavily dominated by the low-frequency channels in the wavelet transform domain. As a result, a new method is developed and implemented to detect textures and abnormalities existing in document images by using polynomial wavelets. Segmentation experiments indicate that this approach is superior to other traditional methods in terms of memory space and processing time

Index to NASA Tech Briefs, 1972

Abstracts of 1972 NASA Tech Briefs are presented. Four indexes are included: subject, personal author, originating center, and Tech Brief number

Graphene Transistor Based Nanoelectronic and Nanophotonic Applications.

Over the past few decades, electronics and photonics have made significant impacts on every aspect of our daily life. Importantly, as the technology advancing and moving forward, the development of these devices not only relies on deeper fundamental understanding but also requires novel materials with unique properties as well as new device architecture to achieve higher performance with more diverse functionalities. In this regards, low dimensional materials inherently possess properties that are conceptually different from those of bulk materials in most aspects. The capability to tailor these nanomaterials as well as their unique properties is essential to achieve unconventional devices with revolutionary impacts. In this dissertation work, our aim is to develop novel nanoelectronics and nanophotonics by exploiting the extraordinary characteristics of purely two-dimensional (2D) monolayer graphene and its heterostructures. Firstly, we design and propose the dual-gate graphene ambipolar transistor that can operate as either common mode or differential mode amplifier by properly tuning the gate biases. Our device can also achieve high noise rejection amplification with common mode rejection ration (CMRR) as high as 80 dB, which is comparable to a commercial operational amplifier (op-amp). Secondly, we demonstrate the hyperbolic metamaterials (HMMs) by using precisely controlled periodic graphene-dielectric multilayer nanostructures to investigate the optical topological transition from elliptical to hyperbolic dispersion in mid-infrared regime. Thirdly, we propose the graphene-SOI heterojunction broadband photodetector design to improve the device on-off operation speed, strengthen the photo-gating effect, as well as minimize the dark current. We further fabricate the single pixels into 32 x 32 matrix arrangement to demonstrate the proof-of-concept image array readout, opening up the development of graphene-based ultra-broadband image sensor array applications. Lastly, we propose the all-graphene transparent photodetector design for light-field imaging and demonstrate the proof-of-concept one-dimensional (1D) ranging by using two stacked single-pixel transparent photodetectors. The results should lay the stepping stones and foundation for the new generation of graphene-based light-field photodetectors and image sensors.PHDElectrical EngineeringUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/135842/1/chehung_1.pd

Computer-Aided Geometry Modeling

Techniques in computer-aided geometry modeling and their application are addressed. Mathematical modeling, solid geometry models, management of geometric data, development of geometry standards, and interactive and graphic procedures are discussed. The applications include aeronautical and aerospace structures design, fluid flow modeling, and gas turbine design

A novel parallel algorithm for surface editing and its FPGA implementation

A thesis submitted to the University of Bedfordshire in partial fulfilment of the requirements for the degree of Doctor of PhilosophySurface modelling and editing is one of important subjects in computer graphics. Decades of research in computer graphics has been carried out on both low-level, hardware-related algorithms and high-level, abstract software. Success of computer graphics has been seen in many application areas, such as multimedia, visualisation, virtual reality and the Internet. However, the hardware realisation of OpenGL architecture based on FPGA (field programmable gate array) is beyond the scope of most of computer graphics researches. It is an uncultivated research area where the OpenGL pipeline, from hardware through the whole embedded system (ES) up to applications, is implemented in an FPGA chip. This research proposes a hybrid approach to investigating both software and hardware methods. It aims at bridging the gap between methods of software and hardware, and enhancing the overall performance for computer graphics. It consists of four parts, the construction of an FPGA-based ES, Mesa-OpenGL implementation for FPGA-based ESs, parallel processing, and a novel algorithm for surface modelling and editing. The FPGA-based ES is built up. In addition to the Nios II soft processor and DDR SDRAM memory, it consists of the LCD display device, frame buffers, video pipeline, and algorithm-specified module to support the graphics processing. Since there is no implementation of OpenGL ES available for FPGA-based ESs, a specific OpenGL implementation based on Mesa is carried out. Because of the limited FPGA resources, the implementation adopts the fixed-point arithmetic, which can offer faster computing and lower storage than the floating point arithmetic, and the accuracy satisfying the needs of 3D rendering. Moreover, the implementation includes Bézier-spline curve and surface algorithms to support surface modelling and editing. The pipelined parallelism and co-processors are used to accelerate graphics processing in this research. These two parallelism methods extend the traditional computation parallelism in fine-grained parallel tasks in the FPGA-base ESs. The novel algorithm for surface modelling and editing, called Progressive and Mixing Algorithm (PAMA), is proposed and implemented on FPGA-based ES’s. Compared with two main surface editing methods, subdivision and deformation, the PAMA can eliminate the large storage requirement and computing cost of intermediated processes. With four independent shape parameters, the PAMA can be used to model and edit freely the shape of an open or closed surface that keeps globally the zero-order geometric continuity. The PAMA can be applied independently not only FPGA-based ESs but also other platforms. With the parallel processing, small size, and low costs of computing, storage and power, the FPGA-based ES provides an effective hybrid solution to surface modelling and editing