Alatan, A. AydınErdem, A. TanjuOnural, Levent2016-02-082016-02-081997-020277-786Xhttp://hdl.handle.net/11693/27692Date of Conference: 8-14 February 1997Conference name: Electronic Imaging '97 - Proceedings - Visual Communications and Image Processing '97We propose a novel method for estimating the 3D motion and dense structure of an object form its two 2D images. The proposed method is an iterative algorithm based on the theory of projections onto convex sets (POCS) that involves successive projections onto closed convex constraint sets. We seek a solution for the 3D motion and structure information that satisfies the following constraints: (i) rigid motion - the 3D motion parameters are the same for each point on the object. (ii) Smoothness of the structure - depth values of the neighboring points on the object vary smoothly. (iii) Temporal correspondence - the intensities in the given 2D images match under the 3D motion and structure parameters. We mathematically derive the projection operators onto these sets and discuss the convergence properties of successive projections. Experimental results show that the proposed method significantly improves the initial motion and structure estimates.English3-D motion estimationProjections onto convex setsStructure estimationVideo codingCommunicationConstraint theoryDigital image storageImage codingImage communication systemsImage enhancementImage processingImaging systemsMechanismsMotion compensationMotion estimationProgramming theorySet theoryVisual communication2d images3d motionsConvergence propertiesConvex constraintsConvex projectionsDense structuresIterative algorithmsNeighboring pointsNovel methodsProjection operatorsProjections onto convex setsStructure informationsStructure parametersVideo codingThree dimensionalConference Paper10.1117/12.263192