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Measurement of Image Velocity

'The Springer International Series in Engineering and Computer Science'. 1992. Auflage. Book. Sprache:…
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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 ... weiterlesen
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Produktdetails
Titel: Measurement of Image Velocity
Autor/en: David J. Fleet

ISBN: 0792391985
EAN: 9780792391982
'The Springer International Series in Engineering and Computer Science'.
1992. Auflage.
Book.
Sprache: Englisch.
Springer US

31. März 1992 - gebunden - 222 Seiten

Beschreibung

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.

Inhaltsverzeichnis

Foreword; A.D. Jepson. Preface. I. Background. 1. Introduction. 2. Time-Varying Image Formation. 3. Image Velocity and Frequency Analysis. 4. Velocity-Specific Representation. 5. Review of Existing Techniques. II: Phase-Based Velocity Measurement. 6. Image Velocity as Local Phase Behavior. 7. Experimental Results. 8. Computing 2-D Velocity. III: On Phase Properties of Band-Pass Signals. 9. Scale-Space Phase Stability. 10. Scale-Space Phase Singularities. 11. Application to Natural Images. IV: Conclusions. 12. Summary and Discussion. Appendices: A. Reflectance Model. B. Proof of and n-D Uncertainty Relation. C. Numerical Interpolation and Differentiation of R (x,t). D. Additional Experiments. E. Approximations to E[Deltaphi] and E[|Deltaphi-E[Deltaphi]|] F. Derivations of z1. G. Density Functions for phix(x) and rhox(x)/rho(x). Bibliography. Index.

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