Publication

Multiple Light Sources Recovery in the Presence of Specularities and Texture

Pascal Fua
2005
Reports

Résumé

Recovering the light sources from images in which the objects can move is difficult both because the specularities travel along the surfaces and because diffuse reflections do not remain constant. In this paper, we show that this can nevertheless be done without making the very restrictive assumptions that are usually made provided that 3D models of some scene objects are available or can be computed. Our approach involves following local gray-level maxima and deciding whether or not they represent specularities. The true specularities are then used to count how many light sources are in the scene, compute their precise location and estimate the material properties.

Source officielle

https://infoscience.epfl.ch/entities/publication/7689579b-8e9a-4524-a24c-140043f809a2

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Pascal Fua
2005
Reports

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/7689579b-8e9a-4524-a24c-140043f809a2

À propos de ce résultat

Concepts associés (32)

Diffuse reflection

Diffuse reflection is the reflection of light or other waves or particles from a surface such that a ray incident on the surface is scattered at many angles rather than at just one angle as in the case of specular reflection. An ideal diffuse reflecting surface is said to exhibit Lambertian reflection, meaning that there is equal luminance when viewed from all directions lying in the half-space adjacent to the surface.

Specular reflection

Specular reflection, or regular reflection, is the mirror-like reflection of waves, such as light, from a surface. The law of reflection states that a reflected ray of light emerges from the reflecting surface at the same angle to the surface normal as the incident ray, but on the opposing side of the surface normal in the plane formed by the incident and reflected rays. This behavior was first described by Hero of Alexandria (AD c. 10–70). Later, Alhazen gave a complete statement of the law of reflection.

Specularity

Specularity is the visual appearance of specular reflections. In computer graphics, it means the quantity used in three-dimensional (3D) rendering which represents the amount of reflectivity a surface has. It is a key component in determining the brightness of specular highlights, along with shininess to determine the size of the highlights. It is frequently used in real-time computer graphics and ray tracing, where the mirror-like specular reflection of light from other surfaces is often ignored (due to the more intensive computations required to calculate it), and the specular reflection of light directly from point light sources is modeled as specular highlights.

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Publications associées (5)

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Multiple Light Sources Recovery in the Presence of Specularities and Texture

Chattez avec Graph Search

GeRaF: Neural Geometry Reconstruction from Radio Frequency Signals

Massive 3D models and physical data for building simulation at the urban scale

Transparent and Specular Object Reconstruction with a Plenoptic Camera