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description= Personal webpage of Jan Kautz.;
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and artifact analysis for video collections of places j tompkin m h kim k i kim j kautz c theobalt acm transactions on applied perception presented at acm sap 10 3 august 2013 13 1 13 19 pdf supplemental video webpage emerging interfaces for video collections of places attempt to link similar content with seamless transitions however the automatic computer vision techniques that enable these transitions have many failure cases which lead to artifacts in the final rendered transition under these conditions which transitions are preferred by participants and which artifacts are most objectionable we perform an experiment with participants comparing seven transition types from movie cuts and dissolves to image based warps and virtual camera transitions across five scenes in a city this document describes how we condition this experiment on slight and considerable view change cases and how we analyze the feedback from participants to find their preference for transition types and artifacts we discover that transition preference varies with view change that automatic rendered transitions are significantly preferred even with some artifacts and that dissolve transitions are comparable to less sophisticated rendered transitions this leads to insights into what visual features are important to maintain in a rendered transition and to an artifact ordering within our transitions siggraph fourier analysis of stochastic sampling strategies for assessing bias and variance in integration k subr j kautz acm transactions on graphics proceedings siggraph 2013 32 4 july 2013 pages 128 1 128 12 pdf pdf 2mb each pixel in a photorealistic computer generated picture is calculated by approximately integrating all the light arriving at the pixel from the virtual scene a common strategy to calculate these high dimensional integrals is to average the estimates at stochastically sampled locations the strategy with which the sampled locations are chosen is of utmost importance in deciding the quality of the approximation and hence rendered image we derive connections between the spectral properties of stochastic sampling patterns and the first and second order statistics of estimates of integration using the samples our equations provide insight into the assessment of stochastic sampling strategies for integration we show that the amplitude of the expected fourier spectrum of sampling patterns is a useful indicator of the bias when used in numerical integration we deduce that estimator variance is directly dependent on the variance of the sampling spectrum over multiple realizations of the sampling pattern we then analyse gaussian jittered sampling a simple variant of jittered sampling that allows a smooth trade off of bias for variance in uniform regular grid sampling we verify our predictions using spectral measurement quantitative integration experiments and qualitative comparisons of rendered images siggraph content adaptive lenticular prints j tompkin s heinzle j kautz w matusik acm transactions on graphics proceedings siggraph 2013 32 4 july 2013 pages 133 1 133 10 pdf supplemental video webpage lenticular prints are a popular medium for producing automultiscopic glasses free 3d images traditionally the light field emitted by such prints has a fixed spatial and angular resolution a trade off which is defined by the width of the individual lenslets as well as the number of pixels underneath each of those lenslets we increase both perceived angular and spatial resolution by modifying the lenslet array to better match the content of a given light field our optimization algorithm analyzes the input light field and computes an optimal lenslet size shape and arrangement that best matches the input light field given a set of output parameters the resulting lenticular print shows higher detail and smoother motion parallax compared to fixed size lens arrays we demonstrate our technique using rendered simulations and by 3d printing lens arrays and we validate our approach in simulation with a user study cvpr fully connected crfs with non parametric pairwise potentials n campbell k subr j kautz ieee conference on computer vision and pattern recognition cvpr 2013 june 2013 pages 1658 1665 pdf supplemental conditional random fields crfs are used for diverse tasks ranging from image denoising to object recognition for images they are commonly defined as a graph with nodes corresponding to individual pixels and pairwise links that connect nodes to their immediate neighbors recent work has shown that fully connected crfs where each node is connected to every other node can be solved efficiently under the restriction that the pairwise term is a gaussian kernel over a euclidean feature space in this paper we generalize the pairwise terms to a non linear dissimilarity measure that is not required to be a distance metric to this end we use an efficient embedding technique to estimate an approximate euclidean feature space in which the pairwise term can still be expressed as a gaussian kernel we demonstrate that the use of non parametric models for the pairwise interactions conditioned on the input data greatly increases expressive power whilst maintaining efficient inference eurographics accurate binary image selection from inaccurate user input k subr s paris c soler j kautz computer graphics forum proceedings eurographics 2013 32 2 may 2013 pages 41 50 pdf selections are central to image editing e g they are the starting point of common operations such as copy pasting and local edits creating them by hand is particularly tedious and scribble based techniques have been introduced to assist the process by interpolating a few strokes specified by users these methods generate precise selections however most of the algorithms assume a 100 accurate input and even small inaccuracies in the scribbles often degrade the selection quality which imposes an additional burden on users in this paper we propose a selection technique tolerant to input inaccuracies we use a dense conditional random field crf to robustly infer a selection from possibly inaccurate input further we show that patch based pixel similarity functions yield more precise selection than simple point wise metrics however efficiently solving a dense crf is only possible in low dimensional euclidean spaces and the metrics that we use are high dimensional and often non euclidean we address this challenge by embedding pixels in a low dimensional euclidean space with a metric that approximates the desired similarity function the results show that our approach performs better than previous techniques and that two options are sufficient to cover a variety of images depending on whether the objects are textured chi panoinserts practical spatial teleconferencing f pece w steptoe f wanner s julier t weyrich j kautz a steed acm conference on human factors in computing systems chi 2013 april 2013 pages 1319 1328 best paper honorable mention award pdf video we present panoinserts a teleconferencing system that uses smartphone cameras to create a surround plus video representation of meeting places we take a static panoramic image of a location and insert live video windows from smart phones we use a combination of marker and image based tracking to position the video inserts within the panorama and transmit this representation to a remote viewer we re port findings from a user study comparing our system against fully panoramic video and conventional webcam video conferencing for two tasks 1 determining where objects are positioned at a remote location and 2 instructing a confederate to place objects in the remote location results indicate that our system performs comparably to full panoramic video systems and significantly better than standard video conferencing in tasks that require accurate surround representation of a remote space we discuss the representational properties and usability of the system for video communication applications 2012 cvmp interactive viewpoint video textures p levieux j tompkin j kautz conference on visual media production cvmp 2012 december 2012 pages 11 17 pdf www we propose an approach to interactively explore video textures from different viewpoints scenes can be played back continuously and in a temporally coherent fashion from any camera location along a path our algorithm takes as input short videos from a set of discrete camera locations and does not require contemporaneous capture data is acquired by moving a single camera we analyze this data to find optimal transitions within each video equivalent to video textures and to find good transition points between spatially distinct videos we propose a spatio temporal view synthesis approach that dynamically creates intermediate frames to maintain temporal coherence we demonstrate our approach on a variety of scenes with stochastic or repetitive motions and we analyze the limits of our approach and failure case artifacts cvmp two frame stereo photography in low light settings a preliminary study k subr g bradbury j kautz conference on visual media production cvmp 2012 december 2012 pages 84 93 pdf image pairs captured using binocular stereo vision cameras are increasingly used to reconstruct partial 3d information matching corresponding points in a left right image pair is a crucial step in this reconstruction and one that is both slow and surprisingly fragile the reconstruction problem is exacerbated by noise or blur in the input images because of the potential ambiguities they introduce in the matching process for scenes that are poorly illuminated it is necessary to make a combination of three adjustments to increase the size of the aperture to allow more light to increase the duration of exposure and to increase the sensor gain iso these adjustements potentially introduce defocus motion blur and noise all of which adversely affect reconstruction we present an exploratory study of how they relatively affect reconstruction by comparing the performances of a few reconstruction algorithms over the space of exposures cg a beaming an asymmetric telepresence system a steed w steptoe w oyekoya f pece t weyrich j kautz d friedman a peer m solazzi f tecchia m bergamasco m slater ieee computer graphics and applications 32 6 november december 2012 pages 10 17 pdf the beaming project recreates virtually a real environment using immersive vr remote participants can visit the virtual model and interact with the people in the real environment the real environment doesn t need extensive equipment and can be a space such as an office or meeting room domestic environment or social space siggraph asia 3d printing of non assembly articulated models j calì d a calian c amati r kleinberger a steed j kautz t weyrich acm transactions on graphics proceedings siggraph asia 2012 31 6 november 2012 pages 130 1 130 8 pdf video additive manufacturing 3d printing is commonly used to produce physical models for a wide variety of applications from archaeology to design while static models are directly supported it is desirable to also be able to print models with functional articulations such as a hand with joints and 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...
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