IEEE Trans Image Process - Adaptive image warping for hole prevention in 3D view synthesis.

Tópicos

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Resumo

Increasing popularity of 3D videos calls for new methods to ease the conversion process of existing monocular video to stereoscopic or multi-view video. A popular way to convert video is given by depth image-based rendering methods, in which a depth map that is associated with an image frame is used to generate a virtual view. Because of the lack of knowledge about the 3D structure of a scene and its corresponding texture, the conversion of 2D video, inevitably, however, leads to holes in the resulting 3D image as a result of newly-exposed areas. The conversion process can be altered such that no holes become visible in the resulting 3D view by superimposing a regular grid over the depth map and deforming it. In this paper, an adaptive image warping approach as an improvement to the regular approach is proposed. The new algorithm exploits the smoothness of a typical depth map to reduce the complexity of the underlying optimization problem that is necessary to find the deformation, which is required to prevent holes. This is achieved by splitting a depth map into blocks of homogeneous depth using quadtrees and running the optimization on the resulting adaptive grid. The results show that this approach leads to a considerable reduction of the computational complexity while maintaining the visual quality of the synthesized views.

Resumo Limpo

increas popular d video call new method eas convers process exist monocular video stereoscop multiview video popular way convert video given depth imagebas render method depth map associ imag frame use generat virtual view lack knowledg d structur scene correspond textur convers d video inevit howev lead hole result d imag result newlyexpos area convers process can alter hole becom visibl result d view superimpos regular grid depth map deform paper adapt imag warp approach improv regular approach propos new algorithm exploit smooth typic depth map reduc complex under optim problem necessari find deform requir prevent hole achiev split depth map block homogen depth use quadtre run optim result adapt grid result show approach lead consider reduct comput complex maintain visual qualiti synthes view

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