Dlaczego fotografia otworkowa?

Esej fotograficzny

View and depth preprocessing for view synthesis enhancement

In the paper, two preprocessing methods for virtual view synthesis are presented. In the first approach, both horizontal and vertical resolutions of the real views and the corresponding depth maps are doubled in order to perform view synthesis on images with densely arranged points. In the second method, real views are filtered in order to eliminate blurred or improperly shifted edges of the objects. Both methods are performed prior to synthesis, thus they may be applied to different Depth-Image-Based Rendering algorithms. In the paper, for both proposed methods, the achieved quality gains are presented

Hierarchical fast selection of intraframe prediction mode in HEVC

In the new HEVC standard, there are 35 intraframe prediction modes. Therefore, real-time implementations need fast mode pre-selection to reduce the computational load of cost comparison for individual modes. In this paper, a simple technique is proposed to reduce the complexity of the Unified Intra Prediction by decreasing the mode candidate number evaluated in the Rough Mode Decision step. We call this approach hierarchical as we decrease stepwise the angles between the directions of the prediction modes that are tested. Obviously, the fast mode selection results in significant complexity reduction obtained at the cost of choosing a sub-optimum mode related to slightly reduced compression performance. In the paper, it is proposed how to calculate the trade-off between encoder complexity and compression performance, using the ratio of relative coding time reduction and average bitrate increase estimated for constant decoded video quality. Extensive experiments prove that this ratio is much higher for the proposed technique than for many other techniques from the references

Numerical study of hydrodynamics in an agitated vessel equipped with ecentrically located high-speed impeller

In this study the results of numerical simulations of hydrodynamics in an agitated vessel with eccentrically located impeller (HE3 or propeller) are presented. Mathematical model of the velocity field is based on Navier-Stocks equation. Characteristics of turbulent flow of liquid is described with the use of CFD methods. In this work the Scale Adaptive Simulation approach coupled with Sliding Mesh method is used. The time-dependent simulations were carried out with ANSYS 14 CFX software