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description= Personal webpage of Jan Kautz.;
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his variability and to release the potential of expected error reduction under some specific circumstances expected error reduction has been one of the strongest performing informativeness criteria for active learning until now it has also been prohibitively costly to compute for sizeable datasets we demonstrate our highly practical algorithm comparing it to other active learning measures on classification datasets that vary in sparsity dimensionality and size our algorithm is consistent over multiple runs and achieves high accuracy while querying the human expert for labels at a frequency that matches their desired time budget cgf low cost subpixel rendering for diverse displays t engelhardt t w schmidt j kautz c dachsbacher computer graphics forum 33 1 february 2014 pages 199 209 pdf cgf dl subpixel rendering increases the apparent display resolution by taking into account the subpixel structure of a given display in essence each subpixel is addressed individually allowing the underlying signal to be sampled more densely unfortunately naiì ve subpixel sampling introduces color aliasing as each subpixel only displays a specific color usually r g and b subpixels are used as previous work has shown chromatic aliasing can be reduced significantly by taking the sensitivity of the human visual system into account in this work we find optimal filters for subpixel rendering for a diverse set of 1d and 2d subpixel layout patterns we demonstrate that these optimal filters can be approximated well with analytical functions we incorporate our filters into gpu based multisample antialiasing to yield subpixel rendering at a very low cost 1 2ms filtering time at hd resolution we also show that texture filtering can be adapted to perform efficient subpixel rendering finally we analyze the findings of a user study we performed which underpins the increased visual fidelity that can be achieved for diverse display layouts by using our optimal filters 2013 jvrb bitmap movement detection hdr for dynamic scenes f pece j kautz journal of virtual reality and broadcasting 10 2 december 2013 pages 1 13 extended cvmp 2010 paper pdf exposure fusion and other hdr techniques generate well exposed images from a bracketed image sequence while reproducing a large dynamic range that far exceeds the dynamic range of a single exposure common to all these techniques is the problem that the smallest movements in the captured images generate artefacts ghosting that dramatically affect the quality of the final images this limits the use of hdr and exposure fusion techniques because common scenes of interest are usually dynamic we present a method that adapts exposure fusion as well as standard hdr techniques to allow for dynamic scene without introducing artefacts our method detects clusters of moving pixels within a bracketed exposure sequence with simple binary operations we show that the proposed technique is able to deal with a large amount of movement in the scene and different movement configurations the result is a ghost free and highly detailed exposure fused image at a low computational cost cg a 3d printing spatially varying brdfs o roullier b bickel j kautz w matusik m alexa ieee computer graphics and applications 33 6 november december 2013 pages 48 57 doi a new method fabricates custom surface reflectance and spatially varying bidirectional reflectance distribution functions svbrdfs researchers optimize a microgeometry for a range of normal distribution functions and simulate the resulting surface s effective reflectance using the simulation s results they reproduce an input svbrdf s appearance by distributing the microgeometry on the printed material s surface this method lets people print svbrdfs on planar samples with current 3d printing technology even with a limited set of printing materials it extends naturally to printing svbrdfs on arbitrary shapes siggraph asia the shading probe fast appearance acquisition for mobile ar d a calian k mitchell d nowrouzezahrai j kautz acm siggraph asia 2013 technical briefs november 2013 pages 20 1 20 4 pdf the ubiquity of mobile devices with powerful processors and integrated video cameras is re opening the discussion on practical augmented reality ar despite this technological convergence several issues prevent reliable and immersive ar on these platforms we address one such problem the shading of virtual objects and determination of lighting that remains consistent with the surrounding environment we design a novel light probe and exploit its structure to permit an efficient reformulation of the rendering equation that is suitable for fast shading on mobile devices unlike prior approaches our shading probe directly captures the shading and not the incident light in a scene as such we avoid costly and unreliable radiometric calibration as well as side stepping the need for complex shading algorithms moreover we can tailor the shading probeâ s structure to better handle common lighting scenarios such as outdoor settings we achieve high performance shading of virtual objects in an ar context incorporating plausible local globalillumination effects on mobile platforms uist video collections in panoramic contexts j tompkin f pece r shah s izadi j kautz c theobalt acm symposium on user interface software and technology uist 2013 september 2013 pages 131 140 pdf supplemental webpage video collections of places show contrasts and changes in our world but current interfaces to video collections make it hard for users to explore these changes recent state of the art interfaces attempt to solve this problem for outside in collections but cannot connect inside out collections of the same place which do not visually overlap we extend the focus context paradigm to create a video collections context interface by embedding videos into a panorama we build a spatio temporal index and tools for fast exploration of the space and time of the video collection we demonstrate the flexibility of our representation with interfaces for desktop and mobile flat displays and for a spherical display with joypad and tablet controllers we study with users the effect of our video collection context system to spatio temporal localization tasks and find significant improvements to accuracy and completion time in visual search tasks compared to existing systems we measure the usability of our interface with system usability scale sus and task specific questionnaires and find our system scores higher ieee on visual realism of synthesized imagery e reinhard a efros j kautz h p seidel proceedings of the ieee 101 9 september 2013 pages 1998 2007 doi traditionally computer graphics has been concerned with producing imagery that is as physically accurate as possible but accurate physical simulation of geometry lighting and material properties of a visual scene can be cumbersome and time consuming at the same time human vision is far from accurate which offers an enormous opportunity to create imagery at a reduced computational cost as well as with less reliance on human modelers as a result a recent trend is toward accepting perceptual plausibility instead of physical accuracy as a guiding principle in the design of modeling and rendering systems this requires us to understand visual realism which involves both learning statistical regularities of the world for instance by employing huge amounts of data as well as human s visual perception of it this paper addresses issues related to understanding realism presents several applications and discusses what this interesting approach may lead to in the future acm tap preference 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 ...
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