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| In [[computer graphics]] and [[computer vision]], '''image-based modeling and rendering''' ('''IBMR''') methods rely on a set of two-dimensional images of a scene to generate a three-dimensional model and then [[rendering (computer graphics)|render]] some novel views of this scene.
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| The traditional approach of computer graphics has been used to create a geometric model in 3D and try to reproject it onto a two-dimensional image. Computer vision, conversely, is mostly focused on detecting, grouping, and extracting features (edges, faces, ''etc.'') present in a given picture and then trying to interpret them as three-dimensional clues. Image-based modeling and rendering allows the use of multiple two-dimensional images in order to generate directly novel two-dimensional images, skipping the manual modeling stage.
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| == Light modeling ==
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| Instead of considering only the physical model of a solid, IBMR methods usually focus more on light modeling. The fundamental concept behind IBMR is the [[plenoptic illumination function]] which is a parametrisation of the [[light field]]. The plenoptic function describes the light rays contained in a given volume. It can be represented with seven dimensions: a ray is defined by its position <math>(x,y,z)</math>, its orientation <math>(\theta,\phi)</math>, its wavelength <math>(\lambda)</math> and its time <math>(t)</math>: <math>P (x,y,z,\theta,\phi,\lambda,t)</math>. IBMR methods try to approximate the plenoptic function to render a novel set of two-dimensional images from another. Given the high dimensionality of this function, practical methods place constraints on the parameters in order to reduce this number (typically to 2 to 4).
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| ==IBMR methods and algorithms==
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| *View [[morphing]] generates a transition between images
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| *Panoramic imaging renders panoramas using image mosaics of individual still images
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| *Lumigraph relies on a dense sampling of a scene
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| *Space carving generates a 3D model based on a [[photo-consistency]] check
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| <!--The above deserve better explanations here-->
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| == See also ==
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| * [[View synthesis]]
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| ==External links==
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| *[http://www.cs.ucl.ac.uk/staff/r.freeman/ Mixed Reality Toolkit (MRT)] - [[University College London]]
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| *[http://insight3d.sourceforge.net/ insight3d ] - open source image-based 3d modeling software
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| *[http://www.cs.washington.edu/homes/ccwu/vsfm/ VisualSFM] - GUI application of Multicore-accelerated SFM
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| {{Mixed reality}}
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| [[Category:Computer graphics]]
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| [[Category:Mixed reality]]
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| [[Category:Applications of computer vision]]
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| {{compu-sci-stub}}
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