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description= Personal webpage of Jan Kautz.;
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its recent advances in variance shadow mapping vsm our new formulation allows for the efficient computation of average blocker distances a common bottleneck in pcss based methods furthermore we avoid incorrectly lit pixels commonly encountered in vsm based methods by appropriately subdividing the filter kernel we demonstrate that vssm renders high quality soft shadows efficiently usually over 100 fps for complex scene settings its speed is at least one order of magnitude faster than pcss for large penumbra siggraph interactive on surface signal deformation t ritschel t thormaehlen c dachsbacher j kautz h p seidel acm transactions on graphics proceedings siggraph 2010 29 4 july 2010 pages 36 1 36 8 pdf video we present an interactive system for the artistic control of visual phenomena visible on surfaces our method allows the user to intuitively reposition shadows caustics and indirect illumination using a simple click and drag user interface working directly on surfaces in contrast to previous approaches the positions of the lights or objects in the scene remain unchanged enabling localized edits of individual shading components our method facilitates the editing by computing a mapping from one surface location to another based on this mapping we can not only edit shadows caustics and indirect illumination but also other surface properties such as color or texture in a unified way this is achieved using an intuitive user interface that allows the user to specify position constraints with drag and drop or sketching operations directly on the surface our approach requires no explicit surface parametrization and handles scenes with arbitrary topology we demonstrate the applicability of the approach to interactive editing of shadows reflections refractions textures caustics and diffuse indirect light the effectiveness of the system to achieve an artistic goal is evaluated by a user study siggraph acquisition and analysis of bispectral bidirectional reflectance and reradiation distribution functions m hullin j hanika b ajdin j kautz h p seidel h lensch acm transactions on graphics proceedings siggraph 2010 29 4 july 2010 pages 97 1 97 7 pdf in fluorescent materials light from a certain band of incident wavelengths is reradiated at longer wavelengths i e with a reduced per photon energy while fluorescent materials are common in everyday life they have received little attention in computer graphics especially no bidirectional reradiation measurements of fluorescent materials have been available so far in this paper we extend the well known concept of the bidirectional reflectance distribution function brdf to account for energy transfer between wavelengths resulting in a bispectral bidirectional reflectance and reradiation distribution function bispectral brrdf using a bidirectional and bispectral measurement setup we acquire reflectance and reradiation data of a variety of fluorescent materials including vehicle paints paper and fabric and compare their renderings with rgb rgb times rgb and spectral brdfs our acquisition is guided by a principal component analysis on complete bispectral data taken under a sparse set of angles we show that in order to faithfully reproduce the full bispectral information for all other angles only a very small number of wavelength pairs needs to be measured at a high angular resolution 2009 siggraph asia micro rendering for scalable parallel final gathering t ritschel t engelhardt t grosch h p seidel j kautz c dachsbacher acm transactions on graphics proceedings siggraph asia 2009 28 5 december 2009 pages 132 1 132 8 pdf video recent approaches to global illumination for dynamic scenes achieve interactive frame rates by using coarse approximations to geometry lighting or both which limits scene complexity and rendering quality high quality global illumination renderings of complex scenes are still limited to methods based on ray tracing while conceptually simple these techniques are computationally expensive we present an efficient and scalable method to compute global illumination solutions at interactive rates for complex and dynamic scenes our method is based on parallel final gathering running entirely on the gpu at each final gathering location we perform micro rendering we traverse and rasterize a hierarchical point based scene representation into an importance warped micro buffer which allows for brdf importance sampling the final reflected radiance is computed at each gathering location using the micro buffers and is then stored in image space we can trade quality for speed by reducing the sampling rate of the gathering locations in conjunction with bilateral upsampling we demonstrate the applicability of our method to interactive global illumination the simulation of multiple indirect bounces and to final gathering from photon maps vmv real time indirect illumination with clustered visibility z dong t grosch t ritschel j kautz h p seidel vision modeling and visualization workshop vmv 2009 november 2009 pdf video visibility computation is often the bottleneck when rendering indirect illumination however recent methods based on instant radiosity have demonstrated that accurate visibility is not required for indirect illumination to exploit this insight we cluster a large number of virtual point lights which represent the indirect illumination when using instant radiosity into a small number of virtual area lights this allows us to compute visibility using recent real time soft shadow algorithms such approximate and fractional from area visibility is faster to compute and avoids banding when compared to exact binary from point visibility our results show that the perceptual error of this approximation is negligible and that we achieve real time frame rates for large and dynamic scenes acm tap perceptual influence of approximate visibility in indirect illumination i yu a cox m h kim t ritschel t grosch c dachsbacher j kautz acm transactions on applied perception presented at apgv 2009 6 4 september 2009 pages 24 1 24 14 pdf in this paper we evaluate the use of approximate visibility for efficient global illumination traditionally accurate visibility is used in light transport however the indirect illumination we perceive on a daily basis is rarely of high frequency nature as the most significant aspect of light transport in real world scenes is diffuse and thus displays a smooth gradation this raises the question of whether accurate visibility is perceptually necessary in this case to answer this question we conduct a psychophysical study on the perceptual influence of approximate visibility on indirect illumination this study reveals that accurate visibility is not required and that certain approximations may be introduced siggraph real time global illumination c dachsbacher j kautz acm siggraph 2009 august 2009 courses www global illumination is an important factor in creating realistic scenes and provides visual cues for understanding scene geometry however global illumination is very costly and only recently has it become viable to render scenes with global illumination effects at interactive frame rates by exploiting the parallelism and programmability of modern gpus these recent gpu based algorithms enable the computation of global illumination solutions for fully dynamic scenes and are of interest to both the academic research community and practitioners of interactive computer graphics in this course we will give a concise overview of recent gpu based global illumination techniques that support fully dynamic scenes compare them and discuss their various strengths and weaknesses after introducing the necessary foundation rendering equation direct vs indirect illumination etc we cover the three main streams of real time global illumination techniques virtual point lights screen space techniques and hierarchical finite elements for each sub topic we first give a brief overview of the basic idea and continue with recent gpu based methods sharing the same basic idea siggraph modeling human color perception under extended luminance levels m h kim t weyrich j kautz acm transactions on graphics proceedings siggraph 2009 28 3 august 2009 pages 27 1 27 9 pdf data supplemental display technology is advancing quickly with peak luminance increasing significantly enabling high dynamic range displays however perceptual color appearance under extended luminance levels has not been studied mainly due to the unavailability of psychophysical data therefore we conduct a psychophysical study in order to acquire appearance data for many different luminance levels up to 16 860cd m 2 covering most of the dynamic range of the human visual system these experimental data allow us to quantify human color perception under extended luminance levels yielding a generalized color appearance model our proposed appearance model is efficient accurate and invertible it can be used to adapt the tone and color of images to different dynamic ranges for cross media reproduction while maintaining appearance that is close to human perception siggraph visio lization generating novel facial images u mohammed s j d prince j kautz acm transactions on graphics proceedings siggraph 2009 28 3 august 2009 pages 57 1 57 8 pdf video our goal is to generate novel realistic images of faces using a model trained from real examples this model consists of two components first we consider face images as samples from a texture with spatially varying statistics and describe this texture with a local non parametric model second we learn a parametric global model of all of the pixel values to generate realistic faces we combine the strengths of both approaches and condition the local non parametric model on the global parametric model we demonstrate that with appropriate choice of local and global models it is possible to reliably generate new realistic face images that do not correspond to any individual in the training data we extend the model to cope with considerable intra class variation pose and illumination finally we apply our model to editing real facial images we demonstrate image in painting interactive techniques for improving synthesized images and modifying facial expressions cvpr capturing multiple illuminations using time and color multiplexing b de decker j kautz t mertens p bekaert ieee conference on computer vision and pattern recognition cvpr 2009 june 2009 pages 2536 2543 pdf video many vision and graphics problems such as relighting structured light scanning and photometric stereo need images of a scene under a number of different illumination conditions it is typically assumed that the scene is static to extend such methods to dynamic scenes dense optical flow can be used to register adjacent frames this registration becomes inaccurate if the frame rate is too low with respect to the degree of movement in the scenes we present a general method that extends time multiplexing with color multiplexing in order to better handle dynamic scenes our method allows for packing more illumination information into a single frame thereby reducing the number of required frames over which optical flow must be computed moreover color multiplexed frames lend themselves better to reliably computing optical flow we show that our method produces better results compared to time multiplexing alone we demonstrate its application to relighting structured light scanning and photometric stereo in dynamic scenes cae consistent scene illumination using a chromatic flash m h kim j kautz computational aesthetics in graphics visualization and imaging cae 2009 may 2009 pages 83 89 pdf video flash photography is commonly used in low light conditions to prevent noise and blurring artifacts however flash photography commonly leads to a mismatch between scene illumination and flash illumination due to the bluish light that flashes emit not only does this change the atmosphere of the original scene illumination it also makes it difficult to perform white balancing because of the illumination differences professional photographers sometimes apply colored gel filters to the flashes in order to match the color temperature while effective this is impractical for the casual photographer we propose a simple but powerful method to automatically match the correlated color temperature of the auxiliary flash light with that of scene illuminations allowing for well lit photographs while maintaining the atmosphere of the scene our technique consists of two main components we first estimate the correlated color temperature of the scene e g during image preview we then adjust the color temperature of the flash to the scene s correlated color temperature which we achieve by placing a small trichromatic lcd in front of the flash we demonstrate the effectiveness of this approach with a variety of examples cgf exposure fusion a simple and practical alternative to high dynamic range photography t mertens j kautz f van reeth computer graphics forum 28 1 march 2009 pages 161 171 extended version of pg 07 doi code we propose a technique for fusing a bracketed exposure sequence into a high quality image without converting to hdr first skipping the physically based hdr assembly step simplifies the acquisition pipeline this avoids camera response curve calibration and is computationally efficient it also allows for including flash images in the sequence our technique blends multiple exposures guided by simple quality measures like saturation and contrast this is done in a multi resolution fashion to account for the brightness variation in the sequence the resulting image quality is comparable to existing tone mapping operators 2008 siggraph asia imperfect shadow maps for efficient computation of indirect illumination t ritschel t grosch m kim h p seidel c dachsbacher j kautz acm transactions on graphics proceedings siggraph asia 2008 27 5 december 2008 pages 128 1 128 8 pdf video we present a method for interactive computation of indirect illumination in large and fully dynamic scenes based on approximate visibility queries while the high frequency nature of direct lighting requires accurate visibility indirect illumination mostly consists of smooth gradations which tend to mask errors due to incorrect visibility we exploit this by approximating visibility for indirect illumination with imperfect shadow maps low resolution shadow maps rendered from a crude point based representation of the scene these are used in conjunction with a global illumination algorithm based on virtual point lights enabling indirect illumination of dynamic scenes at real time frame rates we demonstrate that imperfect shadow maps are a valid approximation to visibility which makes the simulation of global illumination an order of magnitude faster than using accurate visibility siggraph real time all frequency shadows in dynamic scenes t annen z dong t mertens p bekaert h p seidel j kautz acm transact...
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