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Direct Manipulation of Free-Form Deformations

by William M Hsu, John F. Hughes, Henry Kaufman - Computer Graphics , 1992
"... Free-form deformation (FFD) is a powerful modeling tool, but controlling the shape of an object under complex deformations is often difficult. The interface to FFD in most conventional systems simply represents the underlying mathematics directly; users describe deformations by manipulating control ..."
Abstract - Cited by 210 (0 self) - Add to MetaCart
Free-form deformation (FFD) is a powerful modeling tool, but controlling the shape of an object under complex deformations is often difficult. The interface to FFD in most conventional systems simply represents the underlying mathematics directly; users describe deformations by manipulating control

Discontinuous free-form deformations

by Sagi Schein - In Proceedings of the Twelfth Paci c Conference on Computer Graphics and Applications , 2004
"... Contemporary deformation tools let designers modify the geometry of deformed models. This approach can be restrictive if the designer wants to incorporate holes or gaps into a model while deforming it into a different shape. This work presents a variant of FFD that would let the designer incorporate ..."
Abstract - Cited by 7 (0 self) - Add to MetaCart
Contemporary deformation tools let designers modify the geometry of deformed models. This approach can be restrictive if the designer wants to incorporate holes or gaps into a model while deforming it into a different shape. This work presents a variant of FFD that would let the designer

Free-form deformation of solid geometric models

by Thomas W. Sederberg, Scott R. Parry - IN PROC. SIGGRAPH 86 , 1986
"... A technique is presented for deforming solid geometric models in a free-form manner. The technique can be used with any solid modeling system, such as CSG or B-rep. It can deform surface primitives of any type or degree: planes, quadrics, parametric surface patches, or implicitly defined surfaces, f ..."
Abstract - Cited by 701 (1 self) - Add to MetaCart
A technique is presented for deforming solid geometric models in a free-form manner. The technique can be used with any solid modeling system, such as CSG or B-rep. It can deform surface primitives of any type or degree: planes, quadrics, parametric surface patches, or implicitly defined surfaces

Nonrigid registration using free-form deformations: Application to breast MR images

by D. Rueckert, L. I. Sonoda, C. Hayes, D. L. G. Hill, M. O. Leach, D. J. Hawkes - IEEE Transactions on Medical Imaging , 1999
"... Abstract — In this paper we present a new approach for the nonrigid registration of contrast-enhanced breast MRI. A hierarchical transformation model of the motion of the breast has been developed. The global motion of the breast is modeled by an affine transformation while the local breast motion i ..."
Abstract - Cited by 697 (36 self) - Add to MetaCart
is described by a free-form deformation (FFD) based on B-splines. Normalized mutual information is used as a voxel-based similarity measure which is insensitive to intensity changes as a result of the contrast enhancement. Registration is achieved by minimizing a cost function, which represents a combination

Image Metamorphosis Using Snakes and Free-Form Deformations

by Seung-yong Lee, Kyung-Yong Chwa, Sung Yong Shin, George Wolberg , 1995
"... This paper presents new solutions to the following three problems in image morphing: feature specification, warp generation, and transition control. To reduce the burden of feature specification, we first adopt a computer vision technique called snakes. We next propose the use of multilevel free-for ..."
Abstract - Cited by 89 (9 self) - Add to MetaCart
transition functions to control geometry and color blending . Keywords: Image metamorphosis, morphing, snakes, multilevel free-form deformation, multilevel B-spline interpolation. 1. Introduction Image metamorphosis deals with the fluid transformation from one digital image into another. This technique

Hardware-Accelerated Free-Form Deformation

by Clint Chua, Ulrich Neumann , 2000
"... Hardware-acceleration for geometric deformation is developed in the framework of an extension to the OpenGL specification. The method requires an addition to the front-end of the OpenGL rendering pipeline and an appropriate OpenGL primitive. Our approach is to implement general geometric deformation ..."
Abstract - Cited by 6 (0 self) - Add to MetaCart
Hardware-acceleration for geometric deformation is developed in the framework of an extension to the OpenGL specification. The method requires an addition to the front-end of the OpenGL rendering pipeline and an appropriate OpenGL primitive. Our approach is to implement general geometric

Free-Form Deformation for Implicit Surfaces

by Masamichi Sugihara, B. Sc, Masamichi Sugihara
"... photocopying or other means, without the permission of the author. ii ..."
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photocopying or other means, without the permission of the author. ii

Free-Form Deformation for Point-Sampled Surface

by Ping-hsien Lin, Tong-yee Lee, Cheng-fon Lin , 2007
"... In this paper, we present a free-form deformation (FFD) approach to manipulate point-sampled surface. Our approach provides users the powerful free-form deformation directly on point-sampled surface. In the preprocessing, we use a robust extension of hierarchical clustering scheme to partition a poi ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
In this paper, we present a free-form deformation (FFD) approach to manipulate point-sampled surface. Our approach provides users the powerful free-form deformation directly on point-sampled surface. In the preprocessing, we use a robust extension of hierarchical clustering scheme to partition a

AUTOMATIC MESHING OF FREE-FORM DEFORMATION SOLIDS

by Ssuta S. Hsu , 1989
"... This Dissertation is brought to you for free and open access by BYU ScholarsArchive. It has been accepted for inclusion in All Theses and Dissertations by an authorized administrator of BYU ScholarsArchive. For more information, please contact scholarsarchive@byu.edu. Recommended Citation Hsu, Ssuta ..."
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, Ssuta S., "Automatic Meshing of Free-Form Deformation Solids " (1989). All Theses and Dissertations. Paper 3453.

Adaptive Refinement and Decimation under Free-Form Deformation

by James E. Gain, Neil A. Dodgson - Eurographics UK ’99, Cambridge. http://people.cs.uct.ac.za/∼jgain/publications /EUUK99.ps.gz. Cited , 1999
"... The Free-Form Deformation (FFD) methods are a family of intuitive, efficient and versatile free-form modelling techniques, which rely on an ambient warp of the space cocooning an embedded object. However, the distortion caused by FFD significantly degrades the approximation quality of polygon-mesh o ..."
Abstract - Cited by 14 (4 self) - Add to MetaCart
The Free-Form Deformation (FFD) methods are a family of intuitive, efficient and versatile free-form modelling techniques, which rely on an ambient warp of the space cocooning an embedded object. However, the distortion caused by FFD significantly degrades the approximation quality of polygon
Results 1 - 10 of 862