Recovering the Three-dimensional Motion and Structure of Multiple Moving Objects from Binocular Image Flows

Recovering the Three-dimensional Motion and Structure of Multiple Moving Objects from Binocular Image Flows
Author: Wendong Wang
Publisher:
Total Pages: 26
Release: 1993
Genre: Mobile robots
ISBN:

Abstract: "A new method is presented for recovering the three- dimensional motion and structure of multiple, independently-moving, rigid objects through the analysis of binocular image flow fields. The input to the algorithm is the image location and image velocity of a sparse set of feature points in the stereo image pair. The algorithm analyzes one rigid object at a time by simultaneously segmenting the associated feature points from the input data set, establishing the stereo correspondence of these feature points and determining the three-dimensional motion of the object. The solution method is iterative and is based on the stereo-motion algorithm presented in [8] for the analysis of scenes with only one set of three-dimensional motion components. No restrictions on the three- dimensional structure of the scene are required by the theory. Experimental results with numerically generated and laboratory image sequences are given to verify the method."

Image-Based 3D Reconstruction of Dynamic Objects Using Instance-Aware Multibody Structure from Motion

Image-Based 3D Reconstruction of Dynamic Objects Using Instance-Aware Multibody Structure from Motion
Author: Bullinger, Sebastian
Publisher: KIT Scientific Publishing
Total Pages: 194
Release: 2020-08-26
Genre: Computers
ISBN: 373151012X

"This work proposes a Multibody Structure from Motion (MSfM) algorithm for moving object reconstruction that incorporates instance-aware semantic segmentation and multiple view geometry methods. The MSfM pipeline tracks two-dimensional object shapes on pixel level to determine object specific feature correspondences, in order to reconstruct 3D object shapes as well as 3D object motion trajectories" -- Publicaciones de Arquitectura y Arte.

Recovering Three-dimensional Velocity and Establishing Stereo Correspondence from Binocular Image Flows

Recovering Three-dimensional Velocity and Establishing Stereo Correspondence from Binocular Image Flows
Author: James H. Duncan
Publisher:
Total Pages: 28
Release: 1992
Genre: Robot vision
ISBN:

Once the 3-D motion components are computed, stereo correspondence for a pair of potentially matching points is established by comparing three computed depth values: Z[subscript l], obtained from the monocular optical flow equations for the left image; Z[subscript r], obtained from the same equations for the right image; and Z[subscript s], obtained from stereo disparity. For correct matches these three depths must be nearly equal. Experimental results with numerically generated and laboratory image sequences are given to verify the method."

Stereo Scene Flow for 3D Motion Analysis

Stereo Scene Flow for 3D Motion Analysis
Author: Andreas Wedel
Publisher: Springer Science & Business Media
Total Pages: 133
Release: 2011-08-17
Genre: Computers
ISBN: 0857299654

This book presents methods for estimating optical flow and scene flow motion with high accuracy, focusing on the practical application of these methods in camera-based driver assistance systems. Clearly and logically structured, the book builds from basic themes to more advanced concepts, culminating in the development of a novel, accurate and robust optic flow method. Features: reviews the major advances in motion estimation and motion analysis, and the latest progress of dense optical flow algorithms; investigates the use of residual images for optical flow; examines methods for deriving motion from stereo image sequences; analyses the error characteristics for motion variables, and derives scene flow metrics for movement likelihood and velocity; introduces a framework for scene flow-based moving object detection and segmentation; includes Appendices on data terms and quadratic optimization, and scene flow implementation using Euler-Lagrange equations, in addition to a helpful Glossary.

Guide to Three Dimensional Structure and Motion Factorization

Guide to Three Dimensional Structure and Motion Factorization
Author: Guanghui Wang
Publisher: Springer
Total Pages: 214
Release: 2010-09-20
Genre: Computers
ISBN: 9780857290458

The problem of structure and motion recovery from image sequences is an important theme in computer vision. Considerable progress has been made in this field during the past two decades, resulting in successful applications in robot navigation, augmented reality, industrial inspection, medical image analysis, and digital entertainment, among other areas. However, many of these methods work only for rigid objects and static scenes. The study of non-rigid structure from motion is not only of academic significance, but also has important practical applications in real-world, nonrigid or dynamic scenarios, such as human facial expressions and moving vehicles. This practical guide/reference provides a comprehensive overview of Euclidean structure and motion recovery, with a specific focus on factorization-based algorithms. The book discusses the latest research in this field, including the extension of the factorization algorithm to recover the structure of non-rigid objects, and presents some new algorithms developed by the authors. Readers require no significant knowledge of computer vision, although some background on projective geometry and matrix computation would be beneficial. Topics and features: presents the first systematic study of structure and motion recovery of both rigid and non-rigid objects from images sequences; discusses in depth the theory, techniques, and applications of rigid and non-rigid factorization methods in three dimensional computer vision; examines numerous factorization algorithms, covering affine, perspective and quasi-perspective projection models; provides appendices describing the mathematical principles behind projective geometry, matrix decomposition, least squares, and nonlinear estimation techniques; includes chapter-ending review questions, and a glossary of terms used in the book. This unique text offers practical guidance in real applications and implementations of 3D modeling systems for practitioners in computer vision and pattern recognition, as well as serving as an invaluable source of new algorithms and methodologies for structure and motion recovery for graduate students and researchers.

Recovering 2-D Motion Parameters in Scenes Containing Multiple Moving Objects

Recovering 2-D Motion Parameters in Scenes Containing Multiple Moving Objects
Author: Gilad Adiv
Publisher:
Total Pages: 29
Release: 1983
Genre:
ISBN:

A method for extracting the motion parameters of several independently moving objects from displacments field information is described. The method is based on a generalized Hough transform technique. Some of the problems of this technique are addressed and appropriate solutions are proposed. A modified multipass Hough transform appraoch has been implemented, where i each pass windows are lkocated around objects and the transform is applied only to the displacement vectors contained in these windows. The windows are determined by the degree to which the displacement field is locally inconsistent with previously found motion transformations. Thus, the sensitivity of the Hough transform to local events is increased and the motion parameters of small objects can be detected even in a noisy displacement field. The author also use a multi-resolution scheme in both the image plane and the parameter space and thus reduce the computational cost of the technique. The method is demonstrated by experiments based on artifical images with four parameters of 2-d motion: rotation, expansion and tranlation in both axes.

Principles of 3D Image Analysis and Synthesis

Principles of 3D Image Analysis and Synthesis
Author: Bernd Girod
Publisher: Springer Science & Business Media
Total Pages: 475
Release: 2013-03-09
Genre: Computers
ISBN: 1475731868

Traditionally, say 15 years ago, three-dimensional image analysis (aka computer vi sion) and three-dimensional image synthesis (aka computer graphics) were separate fields. Rarely were expert