Proposed Methods for RealTime Visualization of Panoramic Stadium Tribune Images in High Resolution This paper describes and compares two slightly different methods for xe2x80x9crealtimexe2x80x9d visualization of panoramic stadium tribune images in high resolution using a virtual camera. The methods are tested as a part of the novel automatic panoramic surveillance camera system for the protection of people and property at sports stadiums. In the following sections, we introduce and compare our two methods, which are tested with four industrial 4k cameras. The first method processes input video streams composed of already transformed images and most of the operations are done on the CPU. The second method processes original video streams from cameras and specific operations are done on the GPU. Using our two methods and specific PC configuration, it is possible to display a full resolution panoramic video sequence with a maximal frame rate of 11.68 xc2xb1 2.11 fps and 6.82 xc2xb1 1.86 fps. Focusing on a realtime application, more experimental results with the computational efficiency of particular stages in our methods are presented and discussed.

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.