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description= Personal webpage of Jan Kautz.;
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nd knuckles without the need for manual assembly of joint components apart from having to address limitations inherent to the printing process this poses a particular challenge for articulated models that should be posable to allow the model to hold a pose joints need to exhibit internal friction to withstand gravity without their parts fusing during 3d printing this has not been possible with previous printable joint designs in this paper we propose a method for converting 3d models into printable functional non assembly models with internal friction to this end we have designed an intuitive work flow that takes an appropriately rigged 3d model automatically fits novel 3d printable and posable joints and provides an interface for specifying rotational constraints we show a number of results for different articulated models demonstrating the effectiveness of our method presence acting rehearsal in collaborative multimodal mixed reality environments w steptoe j m normand o oyekoya f pece e giannopoulos f tecchia a steed t weyrich j kautz m slater presence teleoperators and virtual environments 21 4 fall 2012 pages 406 422 pdf this paper presents experience of using our multimodal mixed reality telecommunication system to support remote acting rehearsal the rehearsals involved two actors located in london and barcelona and a director in another location in london this triadic audiovisual telecommunication was performed in a spatial and multimodal collaborative mixed reality environment based on the â destination visitorâ paradigm which we define and motivate we detail our heterogeneous system architecture which spans over the three distributed and technologically asymmetric sites and features a range of capture display and transmission technologies the actorsâ and directorâ s experience of rehearsing a scene via the system are then discussed exploring successes and failures of this heterogeneous form of telecollaboration overall the common spatial frame of reference presented by the system to all parties was highly conducive to theatrical acting and directing allowing blocking gross gesture and unambiguous instruction to be issued the relative inexpressivity of the actorsâ embodiments was identified as the central limitation of the telecommunication meaning that moments relying on performing and reacting to consequential facial expression and subtle gesture were less successful eccv background inpainting for videos with dynamic objects and a free moving camera m granados k i kim j tompkin j kautz c theobalt european conference on computer vision eccv 2012 september 2012 pages 682 695 pdf video www we propose a method for removing marked dynamic objects from videos captured with a free moving camera so long as the objects occlude parts of the scene with a static background our approach takes as input a video a mask marking the object to be removed and a mask marking the dynamic objects to remain in the scene to inpaint a frame we align other candidate frames in which parts of the missing region are visible among these candidates a single source is chosen to fill each pixel so that the final arrangement is color consistent in a final step intensity differences between sources are smoothed using gradient domain fusion our frame alignment process assumes that the scene can be approximated using piecewise planar geometry a set of homographies is estimated for each frame pair and one each is selected for aligning pixels such that the color discrepancy is minimized and the epipolar constraints are maintained we provide experimental validation with several real world video sequences to demonstrate that unlike in previous work inpainting videos shot with free moving cameras does not necessarily require estimation of absolute camera positions and per frame per pixel depth maps eccv match graph construction for large image databases k i kim j tompkin m theobald j kautz c theobalt european conference on computer vision eccv 2012 september 2012 pages 272 285 pdf supplemental how best to efficiently establish correspondence among a large set of images or video frames is an interesting unanswered question for large databases the high computational cost of performing pair wise image matching is a major problem however for many applications images are inherently sparsely connected and so current techniques try to correctly estimate small potentially matching subsets of databases upon which to perform expensive pair wise matching our contribution is to pose the identification of potential matches as a link prediction problem in an image correspondence graph and to propose an effective algorithm to solve this problem our algorithm facilitates incremental image matching initially the match graph is very sparse but it becomes dense as we alternate between link prediction and verification we demonstrate the effectiveness of our algorithm by comparing it with several existing alternatives on large scale databases our resulting match graph is useful for many different applications as an example we show the benefits of our graph construction method to a label propagation application which propagates user provided sparse object labels to other instances of that object in large image collections bmvc pmbp patchmatch belief propagation for correspondence field estimation f besse a w fitzgibbon c rother j kautz british machine vision conference bmvc 2012 september 2012 pages 132 1 132 11 best industrial impact award pdf patchmatch is a simple yet very powerful and successful method for optimizing continuous labelling problems the algorithm has two main ingredients the update of the solution space by sampling and the use of the spatial neighbourhood to propagate samples we show how these ingredients are related to steps in a specific form of belief propagation in the continuous space called particle belief propagation pbp however pbp has thus far been too slow to allow complex state spaces we show that unifying the two approaches yields a new algorithm pmbp which is more accurate than patchmatch and orders of magnitude faster than pbp to illustrate the benefits of our pmbp method we have built a new stereo matching algorithm with unary terms which are borrowed from the recent patchmatch stereo work and novel realistic pairwise terms that provide smoothness we have experimentally verified that our method is an improvement over state of the art techniques at sub pixel accuracy level siggraph videoscapes exploring sparse unstructured video collections j tompkin k i kim j kautz c theobalt acm transactions on graphics proceedings siggraph 2012 31 4 august 2012 pages 68 1 68 12 pdf supplemental video www the abundance of mobile devices and digital cameras with video capture makes it easy to obtain large collections of video clips that contain the same location environment or event however such an unstructured collection is difficult to comprehend and explore we propose a system that analyzes collections of unstructured but related video data to create a videoscape a data structure that enables interactive exploration of video collections by visually navigating spatially and or temporally between different clips we automatically identify transition opportunities or portals from these portals we construct the videoscape a graph whose edges are video clips and whose nodes are portals between clips now structured the videos can be interactively explored by walking the graph or by geographic map given this system we gauge preference for different video transition styles in a user study and generate heuristics that automatically choose an appropriate transition style we evaluate our system using three further user studies which allows us to conclude that videoscapes provides significant benefits over related methods our system leads to previously unseen ways of interactive spatio temporal exploration of casually captured videos and we demonstrate this on several video collections siggraph et interactive light field painting j tompkin s muff s jakuschevskij j mccann j kautz m alexa w matusik acm siggraph 2012 emerging technologies august 2012 video www since sutherland s seminal sketchpad work in 1964 direct interaction with computers has been compelling we can directly touch move and change what we see direct interaction is a major contribution to the success of smartphones and tablets but the world is not flat while existing technologies can display realistic multi view stereoscopic 3d content reasonably well interaction within the same 3d space often requires extensive additional hardware this project presents a cheap and easy system that uses the same lenslet array for both multi view autostereoscopic display and 3d light pen position sensing the display provides multi user glasses free autostereoscopic viewing with motion parallax a single near infrared camera located behind the lenslet array is used to track a light pen held by the user full 3d position tracking is accomplished by analysing the pattern produced when light from the pen shines through the lenselet array this light pen can be used to directly draw into a displayed light field or as input for object manipulation or defining parametric lines the system has a number of advantages first it inexpensively provides both multi view autostereoscopic display and 3d sensing with 1 1 mapping a review of the literature indicates that this has not been offered in previous interactive content creation systems second because the same lenslet array provides both 3d display and 3d sensing the system design is extremely simple inexpensive and easy to build and calibrate the demo at siggraph 2012 shows a variety of interesting interaction styles with a prototype implementation freehand drawing polygonal and parametric line drawing model manipulation and model editing eurographics interactive multi perspective imagery from photos and videos h lieng j tompkin j kautz computer graphics forum proceedings eurographics 2012 31 2 may 2012 pages 285 293 pdf video www photographs usually show a scene from a single perspective however as commonly seen in art scenes and objects can be visualized from multiple perspectives making such images manually is time consuming and tedious we propose a novel system for designing multi perspective images and videos first the images in the input sequence are aligned using structure from motion this enables us to track feature points across the sequence second the user chooses portal polygons in a target image into which different perspectives are to be embedded the corresponding image regions from the other images are then copied into these portals due to the tracking feature and automatic warping this approach is considerably faster than current tools we explore a wide range of artistic applications using our system with image and video data such as looking around corners and up and down stair cases recursive multi perspective imaging cubism and panoramas eurographics how not to be seen object removal from videos of crowded scenes m granados j tompkin k kim o grau j kautz c theobalt computer graphics forum proceedings eurographics 2012 31 2 may 2012 pages 219 228 pdf video www removing dynamic objects from videos is an extremely challenging problem that even visual effects professionals often solve with time consuming manual frame by frame editing we propose a new approach to video completion that can deal with complex scenes containing dynamic background and non periodical moving objects we build upon the idea that the spatio temporal hole left by a removed object can be filled with data available on other regions of the video where the occluded objects were visible video completion is performed by solving a large combinatorial problem that searches for an optimal pattern of pixel offsets from occluded to unoccluded regions our contribution includes an energy functional that generalizes well over different scenes with stable parameters and that has the desirable convergence properties for a graph cut based optimization we provide an interface to guide the completion process that both reduces computation time and allows for efficient correction of small errors in the result we demonstrate that our approach can effectively complete complex high resolution occlusions that are greater in difficulty than what existing methods have shown cgf state of the art in interactive global illumination t ritschel t grosch c dachsbacher j kautz computer graphics forum 31 1 february 2012 pages 160 188 pdf cgf dl the interaction of light and matter in the world surrounding us is of striking complexity and beauty since the very beginning of computer graphics adequate modeling of these processes and efficient computation is an intensively studied research topic and still not a solved problem the inherent complexity stems from the underlying physical processes as well as the global nature of the interactions that let light travel within a scene this article reviews the state of the art in emph interactive global illumination computation that is methods that generate an image of a virtual scene in less than one second with an as exact as possible or plausible solution to the light transport additionally the theoretical background and attempts to classify the broad field of methods are described the strengths and weaknesses of different approaches when applied to the different visual phenomena arising from light interaction are compared and discussed finally the article concludes by highlighting design patterns for interactive global illumination and a list of open problems 2011 cvmp towards moment imagery automatic cinemagraphs j tompkin f pece k subr j kautz conference on visual media production cvmp 2011 november 2011 pdf video webpage the imagination of the online photographic community has recently been sparked by so called cinemagraphs short seamlessly looping animated gif images created from video in which only parts of the image move these cinemagraphs capture the dynamics of one particular region in an image for dramatic effect and provide the creator with control over what part of a moment to capture we create a cinemagraphs authoring tool combining video motion stabilisation segmentation interactive motion selection motion loop detection and selection and cinemagraph rendering our work pushes toward the easy and versatile creation of moments that cannot be represented with still imagery jvrc adapting standard video codecs for depth streaming f pece j kautz t weyrich joint virtual reality conference jvrc 2011 september 2011 pages 1 8 pdf cameras that can acquire a continuous stream of depth images are now commonly available for instance the microsoft kinect it may seem that one should be able to stream these depth videos using standard video codecs such as vp8 or h 264 however the quality degrades considerably as the compression algorithms are geared 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