Measurement of Image Velocity
Author: David J Fleet
Publisher:
Published: 1992-03-31
Total Pages: 222
ISBN-13: 9781461536499
DOWNLOAD EBOOK →Author: David J Fleet
Publisher:
Published: 1992-03-31
Total Pages: 222
ISBN-13: 9781461536499
DOWNLOAD EBOOK →Author: David J. Fleet
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 205
ISBN-13: 1461536480
DOWNLOAD EBOOK →Measurement of Image Velocity presents a computational framework for computing motion information from sequences of images. Its specific goal is the measurement of image velocity (or optical flow), the projection of 3-D object motion onto the 2-D image plane. The formulation of the problem emphasizes the geometric and photometric properties of image formation, and the occurrence of multiple image velocities caused, for example, by specular reflections, shadows, or transparency. The method proposed for measuring image velocity is based on the phase behavior in the output of velocity-tuned filters. Extensive experimental work is used to show that phase can be a reliable source of pure image translation, small geometric deformation, smooth contrast variations, and multiple local velocities. Extensive theorectical analysis is used to explain the robustness of phase with respect to deviations from image translation, and to detect situations in which phase becomes unstable. The results indicate that optical flow may be extracted reliably for computing egomotion and structure from motion. The monograph also contains a review of other techniques and frequency analysis applied to image sequences, and it discusses the closely related topics of zero-crossing tracking, gradient-based methods, and the measurement of binocular disparity. The work is relevant to those studying machine vision and visual perception.
Author: David James Fleet
Publisher: National Library of Canada = Bibliothèque nationale du Canada
Published: 1991
Total Pages: 400
ISBN-13: 9780315660052
DOWNLOAD EBOOK →Author: Markus Raffel
Publisher: Springer
Published: 2018-04-03
Total Pages: 669
ISBN-13: 3319688529
DOWNLOAD EBOOK →This immensely practical guide to PIV provides a condensed, yet exhaustive guide to most of the information needed for experiments employing the technique. This second edition has updated chapters on the principles and extra information on microscopic, high-speed and three component measurements as well as a description of advanced evaluation techniques. What’s more, the huge increase in the range of possible applications has been taken into account as the chapter describing these applications of the PIV technique has been expanded.
Author: Giovanna Cavazzini
Publisher: BoD – Books on Demand
Published: 2012-05-23
Total Pages: 402
ISBN-13: 9535106252
DOWNLOAD EBOOK →The Particle Image Velocimetry is undoubtedly one of the most important technique in Fluid-dynamics since it allows to obtain a direct and instantaneous visualization of the flow field in a non-intrusive way. This innovative technique spreads in a wide number of research fields, from aerodynamics to medicine, from biology to turbulence researches, from aerodynamics to combustion processes. The book is aimed at presenting the PIV technique and its wide range of possible applications so as to provide a reference for researchers who intended to exploit this innovative technique in their research fields. Several aspects and possible problems in the analysis of large- and micro-scale turbulent phenomena, two-phase flows and polymer melts, combustion processes and turbo-machinery flow fields, internal waves and river/ocean flows were considered.
Author: Th. Dracos
Publisher: Springer Science & Business Media
Published: 2013-06-29
Total Pages: 322
ISBN-13: 9401587272
DOWNLOAD EBOOK →The contents of this volume reflect to a large extent the efforts made by a group of Institutes at the ETH Zürich to develop new techniques for measurements of flows in fluids in the last decade. The motivation came from the study of tr~sport and mixing processes in natural and industrial systems. One of the characteristic properties of turbulence is its high mixing efficiency. The techniques developed are therefore suitable, although not exclusively, for turbulence measurements. They can be subdivided into point-measurements and field-measurements. The aim of the point-measurements developed is to determine the three components of the velocity and all their first derivatives with good temporal resolution and accuracy in turbulent flows. The old and weIl established method of hot-wire anemometry was used for this purpose. One of the main achievements in this context is the construction of miniature multi-wire probes. This technique was introduced to the Institute of Hydromechanics and Water Resources Management of ETH Zürich by Profs. A. Tsinober and E. Kit from Tel-Aviv University. This was made possible by the generous financial support by ETH, for which I would like to express my gratitude on this occasion. In addition, Dr. F.E. Joergensen from DANTEC contributed an example of recent developments in the hardware ofConstant Temperature Anemometry (CTA), for which I am very thankful.
Author: Ian C. Shepherd
Publisher:
Published: 1993
Total Pages:
ISBN-13:
DOWNLOAD EBOOK →The theory and application of Particle Image Velocimetry is presented. A digital system that was developed at the CSIRO Division of Building, Construction and Engineering is described. Examples of measurements and a guide to possible future uses of PIV is presented.
Author: Tongbeum Kim
Publisher: Butterworth-Heinemann
Published: 2016-07-20
Total Pages: 276
ISBN-13: 0128098740
DOWNLOAD EBOOK →Application of Thermo-Fluidic Measurement Techniques: An Introduction provides essential measurement techniques in heat transfer and aerodynamics. In addition to a brief, but physically elaborate description of the principles of each technique, multiple examples for each technique are included. These examples elaborate all the necessary details of (a) test setups, (b) calibration, (c) data acquisition procedure, and (d) data interpretation, with comments on the limitations of each technique and how to avoid mistakes that are based on the authors’ experience. The authors have different expertise in convection heat transfer and aerodynamics, and have collaborated on various research projects that employ a variety of experimental techniques. Each author has a different view and approach to individual experimental techniques, but these views complement each other, giving new users of each technique a rounded view. With the introduction of this valuable reference book, the reader can quickly learn both the overall and detailed aspects of each experimental technique and then apply them to their own work. Contains both basic principles and fundamental, physical descriptions Provides examples that demonstrate how each experimental technique can be used for industrial testing and academic research in heat transfer and aerodynamics Includes practical and in-depth examples for each technique, with comments on each experimental technique based on the authors’ experiences, including limitations and trial errors with some examples of data interpretation Combines classical techniques in aerodynamics and conduction/convection heat transfer with modern, cutting-edge approaches Collates the information about various pointwise and whole field velocity and thermal measurement techniques in a single resource
Author: Ronald J. Adrian
Publisher: Cambridge University Press
Published: 2011
Total Pages: 585
ISBN-13: 0521440084
DOWNLOAD EBOOK →Particle image velocimetry, or PIV, refers to a class of methods used in experimental fluid mechanics to determine instantaneous fields of the vector velocity by measuring the displacements of numerous fine particles that accurately follow the motion of the fluid. Although the concept of measuring particle displacements is simple in essence, the factors that need to be addressed to design and implement PIV systems that achieve reliable, accurate, and fast measurements and to interpret the results are surprisingly numerous. The aim of this book is to analyze and explain them comprehensively.