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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.
 
== Light modeling ==
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).
 
==IBMR methods and algorithms==
*View [[morphing]] generates a transition between images
*Panoramic imaging renders panoramas using image mosaics of individual still images
*Lumigraph relies on a dense sampling of a scene
*Space carving generates a 3D model based on a [[photo-consistency]] check
<!--The above deserve better explanations here-->
 
== See also ==
* [[View synthesis]]
 
==External links==
*[http://www.cs.ucl.ac.uk/staff/r.freeman/ Mixed Reality Toolkit (MRT)] - [[University College London]]
*[http://insight3d.sourceforge.net/ insight3d ] - open source image-based 3d modeling software
*[http://www.cs.washington.edu/homes/ccwu/vsfm/ VisualSFM] - GUI application of Multicore-accelerated SFM
 
{{Mixed reality}}
 
[[Category:Computer graphics]]
[[Category:Mixed reality]]
[[Category:Applications of computer vision]]
 
 
{{compu-sci-stub}}

Revision as of 16:28, 6 February 2014

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