270 research outputs found
The assessment of visual behaviour and depth perception in surgery
Imperial Users onl
Visualizing the Social Links of Election Monitors with ArcGIS
Spatial analysis of the network of personnel in election monitoring and democratization missions allows users to visualize the impact and interactions these individuals and mission teams have had. This project focuses on the integration of the ArcGIS geographic information system and a private Access database to allow the user to input, edit, and visualize spatial and temporal data during the research of election monitoring networks. These data include the individuals, the missions, the positions held, and the dates of each activity. As these missions and individuals interact through space and time, network analysis will yield nodes of importance. This analysis will assist anthropologists in their study of the spread of democracy and in their study of the individuals supporting election assistance
Affective Computing
This book provides an overview of state of the art research in Affective Computing. It presents new ideas, original results and practical experiences in this increasingly important research field. The book consists of 23 chapters categorized into four sections. Since one of the most important means of human communication is facial expression, the first section of this book (Chapters 1 to 7) presents a research on synthesis and recognition of facial expressions. Given that we not only use the face but also body movements to express ourselves, in the second section (Chapters 8 to 11) we present a research on perception and generation of emotional expressions by using full-body motions. The third section of the book (Chapters 12 to 16) presents computational models on emotion, as well as findings from neuroscience research. In the last section of the book (Chapters 17 to 22) we present applications related to affective computing
Intelligent Circuits and Systems
ICICS-2020 is the third conference initiated by the School of Electronics and Electrical Engineering at Lovely Professional University that explored recent innovations of researchers working for the development of smart and green technologies in the fields of Energy, Electronics, Communications, Computers, and Control. ICICS provides innovators to identify new opportunities for the social and economic benefits of society.ă This conference bridges the gap between academics and R&D institutions, social visionaries, and experts from all strata of society to present their ongoing research activities and foster research relations between them. It provides opportunities for the exchange of new ideas, applications, and experiences in the field of smart technologies and finding global partners for future collaboration. The ICICS-2020 was conducted in two broad categories, Intelligent Circuits & Intelligent Systems and Emerging Technologies in Electrical Engineering
Comparative evaluation of video watermarking techniques in the uncompressed domain
Thesis (MScEng)--Stellenbosch University, 2012.ENGLISH ABSTRACT: Electronic watermarking is a method whereby information can be imperceptibly
embedded into electronic media, while ideally being robust against common signal
manipulations and intentional attacks to remove the embedded watermark. This
study evaluates the characteristics of uncompressed video watermarking techniques
in terms of visual characteristics, computational complexity and robustness against
attacks and signal manipulations.
The foundations of video watermarking are reviewed, followed by a survey of
existing video watermarking techniques. Representative techniques from different
watermarking categories are identified, implemented and evaluated.
Existing image quality metrics are reviewed and extended to improve their performance
when comparing these video watermarking techniques. A new metric for
the evaluation of inter frame flicker in video sequences is then developed.
A technique for possibly improving the robustness of the implemented discrete
Fourier transform technique against rotation is then proposed. It is also shown that
it is possible to reduce the computational complexity of watermarking techniques
without affecting the quality of the original content, through a modified watermark
embedding method.
Possible future studies are then recommended with regards to further improving
watermarking techniques against rotation.AFRIKAANSE OPSOMMING: ân Elektroniese watermerk is ân metode waardeur inligting onmerkbaar in elektroniese
media vasgelĂȘ kan word, met die doel dat dit bestand is teen algemene manipulasies
en doelbewuste pogings om die watermerk te verwyder. In hierdie navorsing
word die eienskappe van onsaamgeperste video watermerktegnieke ondersoek
in terme van visuele eienskappe, berekeningskompleksiteit en weerstandigheid teen
aanslae en seinmanipulasies.
Die onderbou van video watermerktegnieke word bestudeer, gevolg deur ân oorsig
van reedsbestaande watermerktegnieke. Verteenwoordigende tegnieke vanuit verskillende
watermerkkategorieë word geïdentifiseer, geïmplementeer en geëvalueer.
Bestaande metodes vir die evaluering van beeldkwaliteite word bestudeer en uitgebrei
om die werkverrigting van die tegnieke te verbeter, spesifiek vir die vergelyking
van watermerktegnieke. ân Nuwe stelsel vir die evaluering van tussenraampie flikkering
in videoâs word ook ontwikkel.
ân Tegniek vir die moontlike verbetering van die geĂŻmplementeerde diskrete Fourier
transform tegniek word voorgestel om die tegniek se bestandheid teen rotasie
te verbeter. Daar word ook aangetoon dat dit moontlik is om die berekeningskompleksiteit
van watermerktegnieke te verminder, sonder om die kwaliteit van die
oorspronklike inhoud te beĂŻnvloed, deur die gebruik van ân verbeterde watermerkvasleggingsmetode.
Laastens word aanbevelings vir verdere navorsing aangaande die verbetering van
watermerktegnieke teen rotasie gemaak
Computer-based sketching and the productivity of the conceptual stage of design
Many designers find computer-based tools are not as effective during the
early stages of design as manual sketching. However, to abandon the computer in
these conceptual stages denies designers the computerâs capability to translate and
supplement imaginative design thinking. Recent design studies address conceptual
design. What is the impact of computer-based drawing and sketching on designersâ
cognition and productive reasoning?
This research focuses on the relationship between the characteristics of
sketching using the drawing environment of the computer and the productivity of the
conceptual design phase. I provide a theoretical framework that identifies and clarifies
both sketching and productivity. Previous specialized studies are selective and
sometimes only descriptive in defining this relationship. A review of these studies
reveals a gap in our understanding of those aspects of sketching that relate to
visualization, imagination and the generation of design ideas. The thesis addresses
three objectives: (i) to build a comprehensive theoretical framework that on one hand
defines the characteristics of sketching that might affect the generation of design
ideas, and on the other hand defines the productivity of conceptual design and its
indicators; (ii) to apply this framework in a practical study; and (iii) to extract
implications for the relationship.
To address the problem of computer-based sketching, I indentify the
continuity within the dynamic field of images usually generated while designers
sketch as the most effective characteristic of the computer sketching process. I
establish a measure of continuity defined by (i) the degree of ease in projecting design
images, (ii) the degree of continuity of displaying images due to changing the status
of the design objects and due to navigation around the objects, (iii) the degree of
provision of a holistic view (i.e., the total view of the design objects on the computer
screen). Then I define productivity within this framework in terms of the cognitive
operations of dialogical reinterpretation. When sketching, designers seem to perform
key operations such as interpreting, reframing and restructuring. I present the case that
a process rich with these cognitive operations is productive. The study makes use of
the fields of free hand sketching, literature, cognitive psychology and Gestalt theory.
Four indicators emerge from this study: the occurrence of pattern discovery,
conceptual reinterpretation, alternation of thinking, and restructuring.
I identify key variables that define the degree of continuity of the dynamic
field of images which relate to designerâs performance to verify their relationship with
productivity. I study ten design participants who are given a design task that involves
sketching with various CAD systems. The study involves 21 hours of recorded video
analyzed using a method adapted from Goldschmidt's âlinkographyâ tool for
representing design protocols. I identify where patterns of relationships between
variables exist, and where they do not apply. Not all the selected variables of
continuity of the dynamic field of images, nor all the indicators of productivity in the
conceptual design phase, support these patterns of relationships. This indicates that
there is a special group of characteristics of sketching that maintain the pace of
continuity within the dynamic field of images can improve the productivity in the
conceptual phase
Shadow Play: How is a concern with the uncanny made manifest in the artistic practice of Brass Art?
This thesis and the portfolio of supporting work, uses an expanded interpretation of the uncanny to reveal how through shadow play, a concern with the uncanny is made manifest in the artistic practice of Brass Art. In doing so it makes a claim for originality through the public presentation of six artworks created between 2008 and 2016 by the artistic trio Brass Art, of which I am a contributing member. Brass Art is Chara Lewis, Kristin Mojsiewicz and Anneké Pettican, a trio of women artists. For the purposes of this PhD by publication my original contribution to knowledge is an exploration of the emergence of the uncanny in our practice and in the artworks and associated exhibitions presented.
Brass Art use light-based technologies to record our individual and collective presence in a range of situations; from writerâs rooms, to natural history collections, airports, hotels and hot air balloons. These performances are captured by eclectic tools including cameras, watercolour paints, 3D bodyscanners, 4D biomedical facial scanning apparatus, and the Kinect motion sensing device. Each process creates a very different âmaterialâ render of our activities: on paper, in code, as data, through match-moving and rapid prototyping. The tools, methods and processes Brass Art use are iteratively tested in order for us to harness their particular qualities and unforeseen flaws in an attempt to capture the elusive uncanny. Our discoveries are presented in my portfolio of supporting work, and in my thesis and footnotes.
In my reflections upon the unexpected and original discoveries our active participation proffers, this thesis develops my individual appreciation of the uncanny as a vital, ambivalent concept in my investigation of Brass Art. Adopting hybrid performative strategies, material transformations and engagement with technical processes, I assert Brass Art seek to explore a fundamental instability akin to an expanded view of the uncanny
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