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Date: Thu, 07 Nov 1996 19:23:03 GMTServer: NCSA/1.5Content-type: text/htmlLast-modified: Thu, 04 Aug 1994 20:04:52 GMTContent-length: 2185<HTML><HEAD><TITLE> 3D Object Exploration by Purposive Viewpoint Control </TITLE></HEAD><BODY><H1> 3D Object Exploration by Purposive Viewpoint Control </H1><BR><H2> Kyros Kutulakos, Chuck Dyer </H2><P>There has been considerable interest recently in employing simpleobserver behaviors that either make the recovery of scene propertieseasier (e.g., fixation), or combine simple behaviors in order toperform complex tasks such as navigation and obstacle avoidance. Ourwork focuses on the ability of an active observer to control the pointof observation to perform tasks involving the exploration of an object.The developed behaviors that are provably-correct, makesimple motion decisions that are based on the observed local geometryof the scene, and require minimal processing of each image.<P>We first consider the task of recovering the local shape of thesurface at a selected point. Our approach is based on the generalobservation that some positions provide more information about an objectthan others. The existence of such special viewpoints can beexploited only if the observer is mobile and has an efficient anddeterministic strategy for reaching them. We show that the localshape-recovery task can be achieved using a simple and qualitativestrategy for smoothly controlling the point of observation until the viewingdirection is "aligned" with a principal direction at the selectedpoint. Second, we consider the task of deriving a global descriptionof an object. We formulate global surface reconstruction as thequalitative task of smoothly controlling the point of observationso that the visible rim "slides" over a maximal, connected, reconstructible region. We show that this task can be provably achieved for arbitrary smooth surfaces by attempting to maintain a well-defined geometric relationship between the point of observationand the viewed surface.<P>Our approach suggests that the ability to smoothly control the point of observation can lead to provably-correct behaviors for achieving both local and global tasks (e.g., scene exploration, 3D navigation) while also simplifying per-frame computations.</BODY></HTML>⌨️ 快捷键说明
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