24 research outputs found
COMPARATIVE STUDY OF DIFFERENT DIGITAL INPAINTING ALGORITHMS
ABSTRACT Image inpainting is the process of filling in missing parts of damaged images based on information gathered from surrounding areas. In addition to problems of image restoration, inpainting can also be used in wireless transmission and image compression applications. This paper gives comparative study of different Image Inpainting Techniques. The proposed work includes the PDE based inpainting algorithm and Texture synthesis based inpainting algorithm
Feature-preserving image restoration and its application in biological fluorescence microscopy
This thesis presents a new investigation of image restoration and its application to
fluorescence cell microscopy. The first part of the work is to develop advanced image
denoising algorithms to restore images from noisy observations by using a novel featurepreserving
diffusion approach. I have applied these algorithms to different types of
images, including biometric, biological and natural images, and demonstrated their
superior performance for noise removal and feature preservation, compared to several
state of the art methods. In the second part of my work, I explore a novel, simple and
inexpensive super-resolution restoration method for quantitative microscopy in cell
biology. In this method, a super-resolution image is restored, through an inverse process,
by using multiple diffraction-limited (low) resolution observations, which are acquired
from conventional microscopes whilst translating the sample parallel to the image plane,
so referred to as translation microscopy (TRAM). A key to this new development is the
integration of a robust feature detector, developed in the first part, to the inverse process
to restore high resolution images well above the diffraction limit in the presence of strong
noise. TRAM is a post-image acquisition computational method and can be implemented
with any microscope. Experiments show a nearly 7-fold increase in lateral spatial
resolution in noisy biological environments, delivering multi-colour image resolution of
~30 nm
Activities of the Research Institute for Advanced Computer Science
The Research Institute for Advanced Computer Science (RIACS) was established by the Universities Space Research Association (USRA) at the NASA Ames Research Center (ARC) on June 6, 1983. RIACS is privately operated by USRA, a consortium of universities with research programs in the aerospace sciences, under contract with NASA. The primary mission of RIACS is to provide research and expertise in computer science and scientific computing to support the scientific missions of NASA ARC. The research carried out at RIACS must change its emphasis from year to year in response to NASA ARC's changing needs and technological opportunities. Research at RIACS is currently being done in the following areas: (1) parallel computing; (2) advanced methods for scientific computing; (3) high performance networks; and (4) learning systems. RIACS technical reports are usually preprints of manuscripts that have been submitted to research journals or conference proceedings. A list of these reports for the period January 1, 1994 through December 31, 1994 is in the Reports and Abstracts section of this report
Summary of research in progress at ICASE
This report summarizes research conducted at the Institute for Computer Applications in Science and Engineering in applied mathematics, fluid mechanics, and computer science during the period October 1, 1992 through March 31, 1993
The Sixth Copper Mountain Conference on Multigrid Methods, part 2
The Sixth Copper Mountain Conference on Multigrid Methods was held on April 4-9, 1993, at Copper Mountain, Colorado. This book is a collection of many of the papers presented at the conference and so represents the conference proceedings. NASA Langley graciously provided printing of this document so that all of the papers could be presented in a single forum. Each paper was reviewed by a member of the conference organizing committee under the coordination of the editors. The multigrid discipline continues to expand and mature, as is evident from these proceedings. The vibrancy in this field is amply expressed in these important papers, and the collection clearly shows its rapid trend to further diversity and depth
[Research activities in applied mathematics, fluid mechanics, and computer science]
This report summarizes research conducted at the Institute for Computer Applications in Science and Engineering in applied mathematics, fluid mechanics, and computer science during the period April 1, 1995 through September 30, 1995
ICASE/LaRC Workshop on Adaptive Grid Methods
Solution-adaptive grid techniques are essential to the attainment of practical, user friendly, computational fluid dynamics (CFD) applications. In this three-day workshop, experts gathered together to describe state-of-the-art methods in solution-adaptive grid refinement, analysis, and implementation; to assess the current practice; and to discuss future needs and directions for research. This was accomplished through a series of invited and contributed papers. The workshop focused on a set of two-dimensional test cases designed by the organizers to aid in assessing the current state of development of adaptive grid technology. In addition, a panel of experts from universities, industry, and government research laboratories discussed their views of needs and future directions in this field
1991 Summer Study Program in Geophysical Fluid Dynamics : patterns in fluid flow
The GFD program in 1991 focused on pattern forming processes in physics and geophysics. The pricipallecturer, Stephan
Fauve, discussed a variety of systems, including our old favorite, Rayleigh-Bénard convection, but passing on to exotic
examples such as vertically vibrated granular layers. Fauve's lectures emphasize a unified theoretical viewpoint based on
symmetry arguments. Patterns produced by instabilties can be described by amplitude equations, whose form can be deduced
by symmetry arguments, rather than the asymptotic expansions that have been the staple of past Summer GFD Programs. The
amplitude equations are far simpler than the complete equations of motion, and symetry arguments are easier than
asymptotic expansions. Symmetry arguments also explain why diverse systems are often described by the same amplitude
equation. Even for granular layers, where there is not a universaly accepted continuum description, the appropnate amplitude
equation can often be found using symmetry arguments and then compared with experiment.
Our second speaker, Daniel Rothan, surveyed the state of the art in lattice gas computations. His lectures illustrate the
great utility of these methods in simulating the flow of complex multiphase fluids, particularly at low Reynolds numbers. The
lattice gas simulations reveal a complicated phenomenology much of which awaits analytic exploration.
The fellowship lectures cover broad ground and reflect the interests of the staff members associated with the program. They
range from the formation of sand dunes, though the theory of lattice gases, and on to two dimensional-turbulence and
convection on planetary scales. Readers desiring to quote from these report should seek the permission of the authors (a
partial list of electronic mail addresses is included on page v). As in previous years, these reports are extensively reworked for
publication or appear as chapters in doctoral theses. The task of assembling the volume in 1991 was at first faciltated by our
newly acquired computers, only to be complicated by hurricane Bob which severed electric power to Walsh Cottage in the
final hectic days of the Summer.Funding was provided by the National Science Foundation
through Grant No. OCE 8901012