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Efficient view manipulation for cuboid-structured images.pdf
Computers Graphics 38 (2014) 174–182
Contents lists available at ScienceDirect
Computers Graphics
journal homepage: /locate/cag
CAD/Graphics 2013
Ef?cient view manipulation for cuboid-structured images
Yanwen Guo a,n, Guiping Zhang a, Zili Lan a, Wenping Wang b
a State Key Lab for Novel Software Technology, Nanjing University, PR China b Department of Computer Science, The University of Hong Kong, Hong Kong
article info
Article history: Received 31 July 2013 Received in revised form 27 October 2013 Accepted 28 October 2013 Available online 13 November 2013
Keywords: View manipulation Mesh deformation Optimization
abstract
We present in this paper an ef?cient algorithm for manipulating the viewpoints of cuboid-structured images with moderate user interaction. Such images are very popular, and we ?rst recover an approximate geometric model with the prior knowledge of the latent cuboid. While this approximated cuboid structure does not provide an accurate scene reconstruction, we demonstrate that it is suf?cient to re-render the images realistically under new viewpoints in a nearly geometrically accurate manner. The new image with high visual quality is generated by making the rest image region deform in accordance with the re-projected cuboid structure, via a triangular mesh deformation scheme. The energy function has been carefully designed to be a quadratic function so that it can be ef?ciently minimized via solving a sparse linear system. We verify the effectiveness of our technique through testing images with standard and non-standard cuboid structures, and demonstrate an application of upright adjustment of photographs and a user interface which enables the user to watch the scene under new viewpoints on a viewing sphere interactively.
2013 Elsevier Ltd. All rights reserved.
1. Introduction
Advances in imaging technology and hardware improvement of digital cameras result in continuous improvements of image quality. People can take high quality photos at high r
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