# Image-based modeling and rendering

In

computer graphics andcomputer 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 render some novel views of this scene.The traditional approach of computer graphics has been 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 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 thelight 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 $(x,y,z)$, its orientation $(\; heta,phi)$, its wave length $(lambda)$ and its time $(t)$: $P\; (x,y,z,\; heta,phi,lambda,t)$. 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**See also***

View synthesis **External links*** [

*http://www.cs.ucl.ac.uk/staff/r.freeman/ Mixed Reality Toolkit (MRT)*] -University College London

*Wikimedia Foundation.
2010.*

### Look at other dictionaries:

**Image based lighting**— (IBL) is a 3D rendering technique which involves plotting an image onto a dome or sphere which contains the primary subject. The lighting characteristics of the surrounding surface are then taken into account when rendering the scene, using the… … Wikipedia**Rendering (computer graphics)**— Not to be confused with 3D rendering. A variety of rendering techniques applied to a single 3D scene … Wikipedia**3D modeling**— This article is about computer modeling within an artistic medium. For scientific usage, see Computer simulation. 3D computer graphics … Wikipedia**Electric Image Animation System**— Infobox Software caption = Screenshot of Electric Image 6.5.2 name = Electric Image Animation System developer = [http://www.eitechnologygroup.com/ EI TechnologyGroup, LLC.] latest release version = 7.0.1 latest release date = February 2008… … Wikipedia**Solid modeling**— The geometry in solid modeling is fully described in 3‑D space; objects can be viewed from any angle. Modeled and ray traced in Cobalt Solid modeling (or modelling) is a consistent set of principles for mathematical and computer modeling of three … Wikipedia**Polygonal modeling**— In 3D computer graphics, polygonal modeling is an approach for modeling objects by representing or approximating their surfaces using polygons. Polygonal modeling is well suited to scanline rendering and is therefore the method of choice for real … Wikipedia**3D rendering**— is the 3D computer graphics process of automatically converting 3D wire frame models into 2D images with 3D photorealistic effects on a computer.Rendering methods Main Article: RenderingRendering is the final process of creating the actual 2D… … Wikipedia**HSL and HSV**— Fig. 1. HSL (a–d) and HSV (e–h). Above (a, e): cut away 3D models of each. Below: two dimensional plots showing two of a model’s three parameters at once, holding the other constant: cylindrical shells (b, f) of constant saturation, in this case… … Wikipedia**Real3D (3D modeling software)**— Real3D is the name of a cutting edge 3D modeling and raytracing program, originally for the Amiga computer and later also for Unix, Mac OS X and Microsoft Windows. It was created by Realsoft Graphics. It used IFF REAL for its objects. The latest… … Wikipedia**List of computing and IT abbreviations**— This is a list of computing and IT acronyms and abbreviations. Contents: 0–9 A B C D E F G H I J K L M N O P Q R S T U V W X Y … Wikipedia