Optimized design of daylight redirection microstructures combined with planar micro structured light sources for high efficient room lighting integrated in building façades

The acquisition of the geometry of general scenes is related to the interplay of surface geometry, material properties and illumination characteristics. Surface texture and non-Lambertian reflectance properties degrade the reconstruction results by structured light technique. Existing structured light techniques focus on different coding strategy and light sources to improve reconstruction accuracy. The hybrid system consisting of a structured light technique and photometric stereo combines the depth value with normal information to refine the reconstruction results. In this paper, we propose a novel hybrid system consisting of stripe-based structured light and photometric stereo. The effect of surface texture and non-Lambertian reflection on stripe detection is first concluded. Contrary to existing fusion strategy, we propose an improved method for stripe detection to reduce the above factor’s effects on accuracy. The reconstruction problem for general scene comes down to using reflectance properties to improve the accuracy of stripe detection. Several objects, including checkerboard, metal-flat plane and free-form objects with complex reflectance properties, were reconstructed to validate our proposed method, which illustrates the effectiveness on improving the reconstruction accuracy of complex objects. The three-step phase-shifting algorithm was implemented and the reconstruction results were given and also compared with ours. In addition, our proposed framework provides a new feasible scheme for solving the ongoing problem of the reconstruction of complex objects with variant reflectance. The problem can be solved by subtracting the non-Lambertian components from the original grey values of stripe to improve the accuracy of stripe detection. In the future, based on stripe structured light technique, more general reflection models can be used to model different types of reflection properties of complex objects.

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From passive to active structured light sources

Active Photonic Platforms XIII ◽

10.1117/12.2595605 ◽

2021 ◽

Author(s):

Natalia M. Litchinitser ◽

Jiannan Gao ◽

Liang Feng ◽

Michael Scalora ◽

Maria A. Vincenti ◽

...

Keyword(s):

Structured Light ◽

Light Sources

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Fast Facial Detection by Depth Map Analysis

Mathematical Problems in Engineering ◽

10.1155/2013/694321 ◽

2013 ◽

Vol 2013 ◽

pp. 1-10 ◽

Cited By ~ 4

Author(s):

Ming-Yuan Shieh ◽

Tsung-Min Hsieh

Keyword(s):

Image Processing ◽

Facial Recognition ◽

Structured Light ◽

Depth Map ◽

Infrared Light ◽

Light Sources ◽

Detection Scheme ◽

Detection Techniques ◽

The Face ◽

Map Analysis

In order to obtain correct facial recognition results, one needs to adopt appropriate facial detection techniques. Moreover, the effects of facial detection are usually affected by the environmental conditions such as background, illumination, and complexity of objectives. In this paper, the proposed facial detection scheme, which is based on depth map analysis, aims to improve the effectiveness of facial detection and recognition under different environmental illumination conditions. The proposed procedures consist of scene depth determination, outline analysis, Haar-like classification, and related image processing operations. Since infrared light sources can be used to increase dark visibility, the active infrared visual images captured by a structured light sensory device such as Kinect will be less influenced by environmental lights. It benefits the accuracy of the facial detection. Therefore, the proposed system will detect the objective human and face firstly and obtain the relative position by structured light analysis. Next, the face can be determined by image processing operations. From the experimental results, it demonstrates that the proposed scheme not only improves facial detection under varying light conditions but also benefits facial recognition.

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COMPUTER SYSTEM FOR CONTROLLING INDOOR LIGHTING

HERALD of Khmelnytskyi national university ◽

10.31891/2307-5732-2021-295-2-40-44 ◽

2021 ◽

Vol 295 (2) ◽

pp. 40-44

Author(s):

D. STATSENKO ◽

◽

B. ZLOTENKO ◽

S. NATROSHVILI ◽

T. KULIK ◽

...

Keyword(s):

Control System ◽

Remote Control ◽

Programming Languages ◽

Computer System ◽

Control Program ◽

System Control ◽

Light Sources ◽

Lighting Control ◽

Indoor Lighting ◽

Room Lighting

The analysis of modern tendencies related to “Smart House” technologies is carried out in this article. The questions of programming languages of microcontrollers and microprocessors are considered. Software products that are used to create mobile applications for smartphones or tablets are presented. A computer system for remote control of room lighting is considered. The design and principle of its operation are shown schematically. A prototype of a computer system that has the following functions: 1) Control, on / off, lighting systems, depending on the needs of the owner of the premises. 2) Transfer of information about the level of illumination to the user, the owner of the premises. 3) Automatic switching on / off of electric, electroluminescent light sources, which are included in the room lighting control system. Photo of the prototype is shown. The principle of operation of the system control program based on the use of a photoresistor is presented. The Arduino microcontroller receives and processes information from the photoresistor, on the basis of which it automatically sends signals to the room lighting control system. The formulas for calculating the illumination using the results of the data obtained from the photoresistor of the prototype are given. The processed information, using wireless networks, goes to the interactive devices of the user, who can remotely check the value of illumination and, if necessary, control it. The visual interface of a mobile application for mobile phones and tablets using the Android operating system is presented. A computer system for controlling the lighting of premises, which is easy to use and does not require significant financial costs, is considered and analyzed. The methods of modeling, observation and research of computer systems are used in the work. The obtained results allow obtaining an effective computer system for remote control of indoor lighting.

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Wavelength Selective Emitting Materials Using High-Temperature Photonic Structures

MRS Proceedings ◽

10.1557/proc-1162-j02-03 ◽

2009 ◽

Vol 1162 ◽

Author(s):

Yong Sung Kim ◽

Shawn-Yu Lin

Keyword(s):

Energy Transfer ◽

High Temperature ◽

Radiative Energy ◽

Light Sources ◽

Selective Emitter ◽

Photonic Structures ◽

Radiative Energy Transfer ◽

High Efficient ◽

Spectral Control ◽

Photon Recycling

AbstractRecently, wavelength selective emitting materials have attracted extensive interest due to their potential of high optical-to-electricity conversion efficiency for thermal photovoltaic (TPV) cells and realizing high efficient incandescent light sources. A substantial increase in spectral control over thermal radiation and photon recycling can accomplish this objective by the development of high-temperature photonic structures (HTPS) that simultaneously suppress unwanted radiation and enhance emission in a desirable wavelength range. In this paper, we shall review the properties of HTPS as a wavelength selective emitter, the radiative energy transfer relation in real devices, and photon recycling scheme using wavelength selective filters.

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Windshield shape inspection using structured light patterns from two diffuse planar light sources

2009 IEEE/RSJ International Conference on Intelligent Robots and Systems ◽

10.1109/iros.2009.5354273 ◽

2009 ◽

Cited By ~ 1

Author(s):

Jing Xu ◽

Ning Xi ◽

Chi Zhang ◽

Quan Shi

Keyword(s):

Structured Light ◽

Light Sources ◽

Shape Inspection

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Recent developments in gallium nitride micro-light-emitting diode structured light sources

Proceedings of the International Display Workshops ◽

10.36463/idw.2020.0199 ◽

2020 ◽

pp. 199

Author(s):

Martin David Dawson ◽

Johannes Herrnsdorf ◽

Jonathan McKendry ◽

Erdan Gu ◽

Enyuan Xie ◽

...

Keyword(s):

Gallium Nitride ◽

Light Emitting Diode ◽

Structured Light ◽

Light Sources ◽

Light Emitting ◽

Recent Developments

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Plasmonic nanostructures for shrinking structured light to access forbidden transitions

Nanophotonics ◽

10.1515/nanoph-2021-0658 ◽

2022 ◽

Vol 0 (0) ◽

Author(s):

Kyosuke Sakai ◽

Hiroki Kitajima ◽

Keiji Sasaki

Keyword(s):

Near Infrared ◽

Strong Field ◽

Structured Light ◽

Plasmonic Nanostructures ◽

Light Sources ◽

Combined System ◽

Quadrupole Field ◽

Array Architecture ◽

Forbidden Transitions ◽

Tetramer Structure

Abstract Plasmonic nanostructures have considerable applicability in light–matter interactions owing to their capacity for strong field confinement and enhancement. Nanogap structures allow us to tailor electric field distributions at the nanoscale, bridging the differences in size and shape of atomic and light structures. In this study, we demonstrated that a plasmonic tetramer structure can squeeze structured light into a nanoscale area, in which a strong field gradient allows access to forbidden transitions. Numerical simulations showed that the gold tetramer structure on a glass substrate possesses a plasmonic eigenmode, which forms structured light with a quadrupole profile in the nanogap region at the center of the tetramer. The top–down technique employed using electron-beam lithography allows us to produce a gap size of approximately 50 nm, which supports plasmonic resonance in the near-infrared regime. In addition, we demonstrated an array architecture in which a collective lattice resonance enhances the intensity of the quadrupole field in multiple lattice units. This study highlights the possibility of accessing multipolar transitions in a combined system of structured light and plasmonic nanostructures. Our findings may lead to new platforms for spectroscopy, sensing, and light sources that take advantage of the full electronic spectrum of an emitter.

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Spatially Resolved Photoelectron Spectroscopy: Recent Progress and Future Plans

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010013554x ◽

1990 ◽

Vol 48 (2) ◽

pp. 388-389

Author(s):

A. M. Bradshaw

Keyword(s):

Photoelectron Spectroscopy ◽

Chemical Reactivity ◽

Target Material ◽

Orbital Energy ◽

Light Sources ◽

Analytical Technique ◽

Hartree Fock ◽

Spatially Resolved ◽

Koopmans Theorem ◽

Surface Analytical Technique

X-ray photoelectron spectroscopy (XPS or ESCA) was not developed by Siegbahn and co-workers as a surface analytical technique, but rather as a general probe of electronic structure and chemical reactivity. The method is based on the phenomenon of photoionisation: The absorption of monochromatic radiation in the target material (free atoms, molecules, solids or liquids) causes electrons to be injected into the vacuum continuum. Pseudo-monochromatic laboratory light sources (e.g. AlKα) have mostly been used hitherto for this excitation; in recent years synchrotron radiation has become increasingly important. A kinetic energy analysis of the so-called photoelectrons gives rise to a spectrum which consists of a series of lines corresponding to each discrete core and valence level of the system. The measured binding energy, EB, given by EB = hv−EK, where EK is the kineticenergy relative to the vacuum level, may be equated with the orbital energy derived from a Hartree-Fock SCF calculation of the system under consideration (Koopmans theorem).

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