Participated in the Dagstuhl Workshop on “Modeling and Simulation of Sports Games, Sport Movements, and Adaptations to Training” at the Dagstuhl Castle, September 13 – 16, 2015. Motivation Source: Schloss Dagstuhl : Seminar HomepagePast Seminars on this topic include
Augmenting Aerial Earth Maps with Dynamic Information [bibtex file=IrfanEssaWS.bib key=2009-Kim-AAEMWDI] Abstract We introduce methods for augmenting aerial visualizations of Earth (from tools such as Google Earth or Microsoft Virtual Earth) with dynamic information obtained from videos. Our goal is to make Augmented Earth Maps that visualize the live broadcast of dynamic sceneries within a city. […]
Matthew Flagg, Atsushi Nakazawa, Qiushuang Zhang, Sing Bing Kang, Young Kee Ryu, Irfan Essa, James M. Rehg (2009), Human Video Textures In Proceedings of the ACM Symposium on Interactive 3D Graphics and Games 2009 (I3D ’09), Boston, MA, February 27-March 1 (Fri-Sun), 2009 [PDF (see Copyright) | Video in DiVx | Website ] Abstract This paper describes a data-driven approach […]
We define a Spine as a branching axial structure representing the shape and topology of a 3D objects limbs, and capturing the limbs correspondence and motion over time. … In general, our approach combines the objectives of generalized cylinders, 3D scanning, and markerless motion capture to generate baseline models from real puppets, animals, and human subjects.
Citation [bibtex key= 2002-Schodl-CAVS] Abstract We introduce a new optimization algorithm for video sprites to animate realistic-looking characters. Video sprites are animations created by rearranging recorded video frames of a moving object. Our new technique to find good frame arrangements is based on repeated partial replacements of the sequence. It allows the user to specify […]
Citation [bibtex key= 2001-Brostow-IMBSMA] Additional Info Gabriel J. Brostow and Irfan Essa (2001) “Image-based motion blur for stop motion animation” In Proceedings of the 28th annual conference on Computer graphics and interactive techniques (ACM SIGGRPH) Pages: 561 – 566 August 2001, ISBN:1-58113-374-X ACM New York, NY, USA (DOI|PDF|Video|Project Site) Abstract Stop motion animation is a […]
This thesis describes a computer vision system for observing the “action units” of a face using video sequences as input. The visual observation (sensing) is achieved by using an optimal estimation optical flow method coupled with a geometric and a physical (muscle) model describing the facial structure. This modeling results in a time-varying spatial patterning of facial shape and a parametric representation of the independent muscle action groups responsible for the observed facial motions. These muscle action patterns are then used for analysis, interpretation, recognition, and synthesis of facial expressions. Thus, by interpreting facial motions within a physics-based optimal estimation framework, a new control model of facial movement is developed. The newly extracted action units (which we name “FACS+”) are both physics and geometry-based and extend the well-known FACS parameters for facial expressions by adding temporal information and non-local spatial patterning of facial motion.
Abstract Detection of contact and calculation of collision forces is an important problem in any kind of physical multi-body simulation. For computer graphics and physically-based animation, it is especially important to devise methods that combine efficient computational methods with powerful existing graphics tools if one is to obtain a realistic, real-time virtual world. Most of the physical simulations are computationally expensive, […]
We describe a real-time solid modeling system that is based on the physical analogy of forming clay by applying forces. The system is implemented by simulating real materials as they react to user-supplied forces. Unlike other physically-based modeling approaches, the Thingworld system allows the user to restrict forming action to simple global deformations during the initial “roughing in” phase of modeling, and then later concern themselves with detailing.
