Publication

Transparent and Specular Object Reconstruction with a Plenoptic Camera

2015
Student Projects

Abstract

Over the past two decades, most techniques that have been developed are focused on opaque objects with Lambertian reflectance. For the transparent and specular objects, they have more complex light transport effect, which pose challenging problems for the current acquisition systems. In this project, we focus on the current transparent and specular objects reconstruction algorithms. A final algorithm is expected to fully use the advantages of the light field camera and achieve reasonable reconstruction results with a simple acquisition framework.

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2015
Student Projects

Abstract

Official source

Related concepts (31)

Light field camera

A light field camera, also known as a plenoptic camera, is a camera that captures information about the light field emanating from a scene; that is, the intensity of light in a scene, and also the precise direction that the light rays are traveling in space. This contrasts with conventional cameras, which record only light intensity at various wavelengths. One type uses an array of micro-lenses placed in front of an otherwise conventional image sensor to sense intensity, color, and directional information.

Shading

Shading refers to the depiction of depth perception in 3D models (within the field of 3D computer graphics) or illustrations (in visual art) by varying the level of darkness. Shading tries to approximate local behavior of light on the object's surface and is not to be confused with techniques of adding shadows, such as shadow mapping or shadow volumes, which fall under global behavior of light. Shading is used traditionally in drawing for depicting a range of darkness by applying media more densely or with a darker shade for darker areas, and less densely or with a lighter shade for lighter areas.

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 .

Related publications (1)

Transparent and Specular Object Reconstruction with a Plenoptic Camera

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Monocular 3D Reconstruction of Locally Textured Surfaces