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Item Markerless Motion Capture using multiple Color-Depth Sensors(The Eurographics Association, 2011) Berger, Kai; Ruhl, Kai; Schroeder, Yannic; Bruemmer, Christian; Scholz, Alexander; Magnor, Marcus; Peter Eisert and Joachim Hornegger and Konrad PolthierWith the advent of the Microsoft Kinect, renewed focus has been put on monocular depth-based motion capturing. However, this approach is limited in that an actor has to move facing the camera. Due to the active light nature of the sensor, no more than one device has been used for motion capturing so far. In effect, any pose estimation must fail for poses occluded to the depth camera. Our work investigates on reducing or mitigating the detrimental effects of multiple active light emitters, thereby allowing motion capture from all angles. We systematically evaluate the concurrent use of one to four Kinects, including calibration, error measures and analysis, and present a time-multiplexing approach.Item Monocular Pose Reconstruction for an Augmented Reality Clothing System(The Eurographics Association, 2011) Rogge, Lorenz; Neumann, Thomas; Wacker, Markus; Magnor, Marcus; Peter Eisert and Joachim Hornegger and Konrad PolthierIn this paper, we present an approach for realizing an augmented reality system for try-on of apparel. The core component of our system is a quick human pose estimation algorithm based on a single camera view only. Due to monocular input data, pose reconstruction may be ambiguous. We solve this problem by using a markered suit, though not relying on any specific marker layout. To recover 3D joint angles of the person using the system we use Relevance Vector Machine regression with image descriptors that include neighborhood configurations of visible colored markers and image gradient orientations. This novel combination of image descriptors results in a measurable improvement in reconstruction quality. We initialize and evaluate our algorithm with pose data acquired using a motion capture system. As the final step, we simulate a cloth draped around a virtual character adopting the estimated pose. Composing the original view and the rendered cloth creates the illusion of the user wearing virtual garments.Item Measuring BRDFs of Immersed Materials(The Eurographics Association, 2011) Berger, Kai; Reshetouski, Ilya; Magnor, Marcus; Ihrke, Ivo; Peter Eisert and Joachim Hornegger and Konrad PolthierWe investigate the effect of immersing real-world materials into media of different refractive indices. We show, that only some materials follow the Fresnel-governed behaviour. In reality, many materials exhibit unexpected effects such as stronger localized highlights or a significant increase in the glossy reflection due to microgeometry. In this paper, we propose a new measurement technique that allows for measuring the BRDFs of materials that are immersed into different media.Item Adaptive Sampling for Geometry-aware Reconstruction Filters(The Eurographics Association, 2011) Bauszat, Pablo; Eisemann, Martin; Magnor, Marcus; Peter Eisert and Joachim Hornegger and Konrad PolthierWe present an adaptive sampling scheme for Monte-Carlo-based renderers with the aim to support geometryaware filtering techniques for interactive computation of global illumination. While sophisticated filtering techniques for homogeneous areas can already produce high-quality results with as few as one sample per pixel, these approaches lack the ability to filter sufficiently in the vicinity of complex geometric structures. The result are visible artifacts in the final rendering result. Our sampling scheme distributes the samples for the indirect illumination in the image plane according to the necessity of a geometry-aware filtering. We show how to implement our scheme efficiently on current graphics hardware and how to combine it with a sophisticated filtering in order to achieve high-quality interactive frame rates for global illumination simulations. The resulting computational overhead is only in the range of a few milliseconds, making our approach suitable for real-time implementations.Item Guided Image Filtering for Interactive High-quality Global Illumination(The Eurographics Association and Blackwell Publishing Ltd., 2011) Bauszat, Pablo; Eisemann, Martin; Magnor, Marcus; Ravi Ramamoorthi and Erik ReinhardInteractive computation of global illumination is a major challenge in current computer graphics research. Global illumination heavily affects the visual quality of generated images. It is therefore a key attribute for the perception of photo-realistic images. Path tracing is able to simulate the physical behaviour of light using Monte Carlo techniques. However, the computational burden of this technique prohibits interactive rendering times on standard commodity hardware in high-quality. Trying to solve the Monte Carlo integration with fewer samples results in characteristic noisy images. Global illumination filtering methods take advantage of the fact that the integral for neighbouring pixels may be very similar. Averaging samples of similar characteristics in screen-space may approximate the correct integral, but may result in visible outliers. In this paper, we present a novel path tracing pipeline based on an edge-aware filtering method for the indirect illumination which produces visually more pleasing results without noticeable outliers. The key idea is not to filter the noisy path traced images but to use it as a guidance to filter a second image composed from characteristic scene attributes that do not contain noise by default. We show that our approach better approximates the Monte Carlo integral compared to previous methods. Since the computation is carried out completely in screen-space it is therefore applicable to fully dynamic scenes, arbitrary lighting and allows for high-quality path tracing at interactive frame rates on commodity hardware.Item Object-aware Gradient-Domain Image Compositing(The Eurographics Association, 2011) Eisemann, Martin; Kokemüller, Jan; Magnor, Marcus; Peter Eisert and Joachim Hornegger and Konrad PolthierWe describe an approach to suppress bleeding artifacts without altering the boundary location in gradient-domain compositing, a technique to create seamless composites. While gradient-domain compositing has become a stan- dard tool for many complex image editing tasks such as seamless cloning, panorama stitching or scene completion, its quality suffers from mismatches in the composited image regions. We propose an approach that is robust to non- optimal region selection by the user without altering his selection which may be neither intended nor possible for certain compositing tasks. In addition, we present an easy-to-use extension to composite interleaving objects. The usability of our approach is demonstrated by several image compositing tasks and comparisons to current state-of-the-art algorithms in gradient-domain image compositing are presented.Item Data Driven Color Mapping(The Eurographics Association, 2011) Eisemann, Martin; Albuquerque, Georgia; Magnor, Marcus; Silvia Miksch and Giuseppe SantucciIn this paper we present a simple, yet effective method to map data set values of different distributions to a color map in order to reveal interesting structures. We make use of an ordering and a simple projection technique to transform the data set before color mapping. Our transformation yields convincing results for various distributions. It also removes the burden from the user to test several mappings beforehand. A simple angular interpolation technique allows to project the data values of the visualization as desired, interactively.