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4D Model Flow: Precomputed Appearance Alignment for Real‐time 4D Video Interpolation
Author(s) -
Casas Dan,
Richardt Christian,
Collomosse John,
Theobalt Christian,
Hilton Adrian
Publication year - 2015
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/cgf.12756
Subject(s) - computer science , rendering (computer graphics) , computer vision , interpolation (computer graphics) , artificial intelligence , optical flow , computer graphics (images) , motion interpolation , computation , view synthesis , bilinear interpolation , algorithm , image (mathematics) , video processing , video tracking , block matching algorithm
Abstract We introduce the concept of 4D model flow for the precomputed alignment of dynamic surface appearance across 4D video sequences of different motions reconstructed from multi‐view video. Precomputed 4D model flow allows the efficient parametrization of surface appearance from the captured videos, which enables efficient real‐time rendering of interpolated 4D video sequences whilst accurately reproducing visual dynamics, even when using a coarse underlying geometry. We estimate the 4D model flow using an image‐based approach that is guided by available geometry proxies. We propose a novel representation in surface texture space for efficient storage and online parametric interpolation of dynamic appearance. Our 4D model flow overcomes previous requirements for computationally expensive online optical flow computation for data‐driven alignment of dynamic surface appearance by precomputing the appearance alignment. This leads to an efficient rendering technique that enables the online interpolation between 4D videos in real time, from arbitrary viewpoints and with visual quality comparable to the state of the art.