Region Dependent Mesh Refinement for Volumetric Video Workflows This paper addresses high quality mesh optimization for volumetric video. Real persons are captured with multiple cameras and converted to 3D mesh sequences. These volumetric video assets can be used as dynamic 3D objects in arbitrary 3D rendering engines. In this way, 3D representations of real persons are achieved with a high level of detail and realism. Target use cases are augmented reality, virtual reality and mixed reality applications. However, the final rendering quality strongly depends on the hardware capabilities of the target rendering device. In this context, a novel region dependent mesh refinement approach is presented and evaluated with respect to existing workflows. The proposed approach is used in order to obtain a low overall polygon count while keeping details in semantically important regions such as human faces. It combines conventional 2D skin and face detection algorithms and transfers the results to the 3D domain. Further on, a dedicated camera region selection approach is presented which enhances the sharpness and quality of the resulting 3D texture mappings.

Fast Freeviewpoint Video Synthesis Algorithm for Sports Scenes In this paper, we report on a parallel freeviewpoint video synthesis algorithm that can efficiently reconstruct a highquality 3D scene representation of sports scenes. The proposed method focuses on a scene that is captured by multiple synchronized cameras featuring widebaselines. The following strategies are introduced to accelerate the production of a freeviewpoint video taking the improvement of visual quality into account: (1) a sparse point cloud is reconstructed using a volumetric visual hull approach, and an exact 3D ROI is found for each object using an efficient connected components labeling algorithm. Next, the reconstruction of a dense point cloud is accelerated by implementing visual hull only in the ROIs; (2) an accurate polyhedral surface mesh is built by estimating the exact intersections between grid cells and the visual hull; (3) the appearance of the reconstructed presentation is reproduced in a viewdependent manner that respectively renders the nonoccluded and occluded region with the nearest camera and its neighboring cameras. The production for volleyball and judo sequences demonstrates the effectiveness of our method in terms of both execution time and visual quality.