Cubic illumination

Cuttle, Christopher

doi:10.1177/14771535970290010601

Cited by 58 publications

(91 citation statements)

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“…The radiance distribution in the empty space of a scene is rarely taken into account. The empirical analysis of the structure of light fields in empty space is usually limited to measuring the space illumination of radiation and the light vector at a point [3][4][5][6]. In general, radiant flux propagates from light sources to light-absorbing surfaces (however, in some special cases, which rarely occur in real scenes, flux lines can be closed).…”

Section: Introductionmentioning

confidence: 99%

Representing the light field in finite three-dimensional spaces from sparse discrete samples

2009

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We present a method for measurement and reconstruction of light fields in finite spaces. Using a custommade device called a plenopter, we can measure spatially and directionally varying radiance distribution functions from a real-world scene up to their second-order spherical harmonics approximations. Interpolating between measurement points, we can recover this function for arbitrary points of a scene. We visualized the global structure of the light field using light tubes, which gives an intuitive description of the flux propagation throughout three-dimensional scenes and provides information about the quality of light in the scenes. Our second-order reconstructions are sufficient to render convex matte objects and therefore have a direct interest for computer graphics applications.

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Section: Introductionmentioning

confidence: 99%

Representing the light field in finite three-dimensional spaces from sparse discrete samples

2009

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“…Determination of vertical illumination and vector/scalar ratio at a point requires the calculations of cubic illumination [8] at that point. Cubic illumination specifies the spatial distribution of illumination in terms of illuminances on six surfaces of a small cube centered at that point (Fig.…”

Section: Computation Of Vector/scalar Illumination Ratiomentioning

confidence: 99%

Evaluations of Low ambient task - surround lighting system in a simulated environment

Ngai

2016

J Sol State Light

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Task -Ambient lighting provides energy saving but space surrounding the users can be dim and unpleasant. This study proposed a solution of an additional Surround Layer of light. Though a series of simulated lighting scenarios, it examined illumination requirements, dimensionality and appearance of the space by the use of Vector/Scalar and Task/Vertical Illumination Ratios. They were evaluated under several illuminance requirements, Task-Surround combinations and Surround Light source sizes. The results showed that by adding a Surround Light Layer, visual appearance of space surrounding the users could be enhanced and energy savings could be achieved.

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“…Simply following them will not produce good quality lighting. Boyce [12] explores methods which may bridge the gap between indifferent and good quality lighting such as proposals by Cuttle [13][14][15][16][17][18][19] and proposes that if none of these are accepted and adopted in the future, then good quality lighting will only be available to those who can afford the services of a creative, experienced and talented lighting designer.…”

Section: Limitations Of Standardsmentioning

confidence: 99%

Lighting Design in Europe: Aligning the Demands for Lower Energy Usage with Better Quality

Kelly¹,

Duff²

2015

JCEA

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Lighting design is one of the fastest changing areas in building engineering. It has evolved significantly in recent years due to changing technology and demands for improved quality, better control, reduced energy and sustainability. This paper is an overview of what is happening in Europe and elsewhere and examines the literature to find that latest recommendations in the Code for Lighting issued by the SLL (Society of Light and Lighting) in the UK change previous demands for equal illuminance across a working plane to more specific and demanding criteria. There are recommendations for qualitative metrics and better distribution of light so as to enhance the visual appearance of interiors. European standards are also examined and the LENI (lighting energy numerical indicator) has been found to be a better way of reducing energy than installed load. New LED (light-emitting diode) lamp technology is examined and daylight is discussed in the context of these changing demands. It is found that lighting standards and design are changing for the better but that standards will need to evolve further if they are to ensure good quality lighting.

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Cubic illumination

Cited by 58 publications

References 0 publications

Representing the light field in finite three-dimensional spaces from sparse discrete samples

Representing the light field in finite three-dimensional spaces from sparse discrete samples

Evaluations of Low ambient task - surround lighting system in a simulated environment

Lighting Design in Europe: Aligning the Demands for Lower Energy Usage with Better Quality

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