Uniform Illumination Design by Configuration of LED Array and Diffuse Reflection Surface for Color Vision Application

Zhu, Zhaoda; Qu, Xinghua; Guanghui, Jia; Ouyang, Jun

doi:10.1109/jdt.2010.2091942

Cited by 35 publications

(22 citation statements)

References 8 publications

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“…For this purpose have been developed lenses with multiple LEDs and arbitrary shapes [12], diverse lens arrange- ments [13], varying the optical wavelengths [14] and with specific reflectors for color uniformity [15]. In other works the location of each LED in the illuminator is varied to reach a uniform illumination [16].…”

Section: Board Illuminationmentioning

confidence: 99%

Design and Implementation of a Computer Vision System for an Autonomous Chess-Playing Robot

Larregay

Pinna

Ávila

et al. 2018

JC&ST

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This work describes a mechatronic system composed by a robot arm that can play chess autonomously. The system is based on an industrial-grade robot manipulator, a computer vision system, and an open source chess engine. Classification algorithms were implemented in order to detect whether a given chessboard square is occupied, and in that case, if the piece is black or white. Such algorithms were compared in terms of their complexity of implementation, execution time and accuracy of predictions. To achieve an uniform illumination of the chessboard, a theoretical model of an LED illuminance curve was used to find the best orientation for each diode using a genetic algorithm. Both the support base for the LEDs and the chess pieces were made using a 3D printer. This implementation demonstrates the capabilities of the proposed vision-based system, whose complexity can be increased in the future for a number of applications.

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Section: Board Illuminationmentioning

confidence: 99%

Design and Implementation of a Computer Vision System for an Autonomous Chess-Playing Robot

Larregay

Pinna

Ávila

et al. 2018

JC&ST

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“…Accordingly, the reflected irradiance distribution of the detection plane can be expressed as [26] (8)…”

Section: B Irradiance Simulated Algorithm Over the Detection Planementioning

confidence: 99%

“…Bidirectional reflectance distribution function (BRDF) is used to describe the uniformity of light at random direction in space. It can be given by [26], [27] (9) Considering practical condition, the diffuse reflectance ratio of the freeform inner surface is 0.9 in our calculations. To simplify the calculation, a number of sample points which can be regarded as Lambertian secondary point sources are selected to approximate the outline of the freeform surface.…”

Section: B Irradiance Simulated Algorithm Over the Detection Planementioning

confidence: 99%

“…However, there exists a common defect in these researches above, that is, the uniformity would dropped appreciably if the panel size of LEDs is on the order of the distance of the source-target. Consequently, an indirect lighting model was presented for near-field applications in our previous study [26]. We just used a simple hemispherical diffuse surface without well-designed to rearrange the energy emitted from LED array for uniform illumination.…”

Section: Introductionmentioning

confidence: 99%

“…A mathematically simulated algorithm was also constructed to discuss the irradiance distribution of the detection scene. In summary, in most related literature [22]- [26], spherical or planar diffusers are commonly used to obtain a homogeneous scene. However, they (included our previous work) have all ignored the designing of the diffuse surface shape for improving the irradiance uniformity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Diffuse Reflection Freeform Surface for Uniform Illumination

Zhu

Jin

Yang

et al. 2014

J. Display Technol.

Self Cite

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Indirect illumination with light-emitting diodes (LEDs) and diffusers is widely applied in various fields that require uniform illumination. In this paper, a design of diffuse reflection freeform surface is proposed. Based on the Lambertian characteristic of LEDs and ideal diffuse surface, a mathematical model is developed. Nonlinear algebraic equations are established by redistributing the energy emitted from LEDs to the illuminated scene for uniform illumination. Solving these equations numerically, the outline of the diffuse surface is obtained. Finally, by using ray tracing software TracePro, the simulation result shows that the irradiance uniformity of the detection plane is above 95% with high accepted tolerance.

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Proposal of Optimization of the Irradiance Pattern Emitted by the Medical Assistance Device Rapha®

Motta

Guimarães

Delduque

et al. 2019

XXVI Brazilian Congress on Biomedical Engineering

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Uniform Illumination Design by Configuration of LED Array and Diffuse Reflection Surface for Color Vision Application

Cited by 35 publications

References 8 publications

Design and Implementation of a Computer Vision System for an Autonomous Chess-Playing Robot

Design and Implementation of a Computer Vision System for an Autonomous Chess-Playing Robot

Design of Diffuse Reflection Freeform Surface for Uniform Illumination

Proposal of Optimization of the Irradiance Pattern Emitted by the Medical Assistance Device Rapha®

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