Publication

BRDF acquisition with polarizing filters (2016)

2016
Student Projects

Abstract

BRDF (for bidirectional reflectance distribution function) are functions used in computer graphics and optics to describe how an opaque surface reflect the incoming light. The goal of this project is to study technics to separate different components of the BRDF real objects, measured by a static camera with different incoming light direction. There’s different applications for such separation. The main one being es- timating parameters of approximation models used to reduce the space needed to store the BRDF, or reconstruct the full continious signal (sampled during acquisition).

LCAV1445050917

Official source

https://infoscience.epfl.ch/entities/publication/98fa8ebb-a67c-4cb0-8b58-fa4e5059cf0b

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2016
Student Projects

Abstract

LCAV1445050917

Official source

https://infoscience.epfl.ch/entities/publication/98fa8ebb-a67c-4cb0-8b58-fa4e5059cf0b

About this result

Related concepts (32)

Bidirectional reflectance distribution function

The bidirectional reflectance distribution function (BRDF; ) is a function of four real variables that defines how light is reflected at an opaque surface. It is employed in the optics of real-world light, in computer graphics algorithms, and in computer vision algorithms. The function takes an incoming light direction, , and outgoing direction, (taken in a coordinate system where the surface normal lies along the z-axis), and returns the ratio of reflected radiance exiting along to the irradiance incident on the surface from direction .

Rendering equation

In computer graphics, the rendering equation is an integral equation in which the equilibrium radiance leaving a point is given as the sum of emitted plus reflected radiance under a geometric optics approximation. It was simultaneously introduced into computer graphics by David Immel et al. and James Kajiya in 1986. The various realistic rendering techniques in computer graphics attempt to solve this equation. The physical basis for the rendering equation is the law of conservation of energy.

Path tracing

Path tracing is a computer graphics Monte Carlo method of rendering images of three-dimensional scenes such that the global illumination is faithful to reality. Fundamentally, the algorithm is integrating over all the illuminance arriving to a single point on the surface of an object. This illuminance is then reduced by a surface reflectance function (BRDF) to determine how much of it will go towards the viewpoint camera. This integration procedure is repeated for every pixel in the output image.

Related publications (3)

BRDF acquisition with polarizing filters (2016)

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