An LED-only BRDF measurement device

@article{BenEzra2008AnLB,
  title={An LED-only BRDF measurement device},
  author={Moshe Ben-Ezra and Jiaping Wang and Bennett Wilburn and Xiaoyang Li and Le Ma},
  journal={2008 IEEE Conference on Computer Vision and Pattern Recognition},
  year={2008},
  pages={1-8}
}
Light emitting diodes (LEDs) can be used as light detectors and as light emitters. In this paper, we present a novel BRDF measurement device consisting exclusively of LEDs. Our design can acquire BRDFs over a full hemisphere, or even a full sphere (for the bidirectional transmittance distribution function BTDF), and can also measure a (partial) multi-spectral BRDF. Because we use no cameras, projectors, or even mirrors, our design does not suffer from occlusion problems. It is fast… 

Lightdrum—Portable Light Stage for Accurate BTF Measurement on Site

TLDR
A miniaturised light stage for measuring the biddirectional reflectance distribution function (BRDF) and the bidirectional texture function (BTF) of surfaces on site in real world application scenarios is proposed and a marker sticker method is designed and used to allow for the easy rectification and alignment of acquired images during data processing.

Development of a new image based BRDF measurement system using a semicircular ring

We developed a new measurement system for bidirectional reflectance distribution functions (BRDF). The system can obtain simultaneously isotropic BRDF of all scattering angles utilizing a

Experimental Characterization of Single-Color Power LEDs Used as Photodetectors

TLDR
A fair comparison between off-the-shelf power Light emitting diodes (LEDs) and a silicon photodetector with respect to their spectral, temporal, and spatial properties is presented.

Condenser‐Based Instant Reflectometry

TLDR
This work proposes a model fitting algorithm for reconstructing the generalized microfacet model from the sparse BRDF slices captured from a material surface point, and addresses the measurement errors and generates more accurate results than previous work.

A fast and accurate image-based measuring system for isotropic reflection materials

TLDR
The efficiency and accuracy of the proposed image-based BRDF measurement system is demonstrated by generating photorealistic images of the measured BRDF data that include glossy blue, green plastics, gold coated metal and gold metallic paints.

High-dynamic-range camera-based bidirectional reflectance distribution function measurement system for isotropic materials

TLDR
A novel high-dynamic-range camera-based bidirectional reflectance distribution function (BRDF) measurement system that can measure the reflectance property of isotropic materials and the capability and efficiency of the developed system is demonstrated.

Calibrating a Non-isotropic Near Point Light Source Using a Plane

We show that a non-isotropic near point light source rigidly attached to a camera can be calibrated using multiple images of a weakly textured planar scene. We prove that if the radiant intensity

Reflectance scanning

TLDR
A novel reconstruction algorithm is proposed based on the key observation that after factoring out the tangent rotation, the anisotropic surface reflectance lies in a low rank subspace and fit each surface point's reflectance function in the projected lowRank subspace to the observations.

Increasing the Spatial Resolution of BTF Measurement with Scheimpflug Imaging

TLDR
An improved way of acquiring spatially varying surface reflectance represented by a bidirectional texture function (BTF) is presented and the proposed optics doubles the spatial resolution of images compared to standard perspective imaging optics.

Reflectance and Shape Estimation with a Light Field Camera Under Natural Illumination

TLDR
This work presents a solution that simultaneously recovers the reflectance and shape of an object under natural illumination with commercially available handy cameras and provides positive results in both simulation and real-world experiments.
...

References

SHOWING 1-10 OF 23 REFERENCES

Multiplexed Illumination for Measuring BRDF Using an Ellipsoidal Mirror and a Projector

TLDR
It is shown that the dynamic range of the measured BRDF can be significantly increased by multiplexed illumination based on the Hadamard matrix.

High-Speed Measurement of BRDF using an Ellipsoidal Mirror and a Projector

TLDR
This paper presents a high-speed method to measure BRDFs using an ellipsoidal mirror and a projector that makes it possible to change incident angles without a mechanical drive.

A Reflective Light Stage

We present a novel acquisition device to capture high resolution 4D reflectance fields of real scenes. The device consists of a concave hemispherical surface coated with a rough specular paint and a

A dual light stage

TLDR
This work presents a technique for capturing high-resolution 4D reflectance fields using the reciprocity property of light transport, and demonstrates how this technique reproduces sharp specular reflections and self-shadowing more accurately than previous approaches.

BRDF/BTF measurement device

  • Kristin J. Dana
  • Physics
    Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001
  • 2001
TLDR
A device for BRDF/BTF measurement is presented that is compact, economical and convenient that uses the approach of curved mirrors to remove the need for hemispherical positioning of the camera and illumination source.

Image-based bidirectional reflectance distribution function measurement.

We present a new image-based process for measuring a surface's bidirectional reflectance rapidly, completely, and accurately. Requiring only two cameras, a light source, and a test sample of known

Measuring bidirectional texture reflectance with a kaleidoscope

We describe a new technique for measuring the bidirectional texture function (BTF) of a surface that requires no mechanical movement, can measure surfaces in situ under arbitrary lighting conditions,

BRDF Acquisition with Basis Illumination

TLDR
This paper develops a novel theory for directly measuring BRDFs in a basis representation by projecting incident light as a sequence of basis functions from a spherical zone of directions and derives an orthonormal basis over spherical zones that is ideally suited for this task.

Multiplexing for Optimal Lighting

TLDR
The paper gives the optimal scheme by which lighting should be multiplexed to obtain the highest quality output, for signal-independent noise, and analyzes the implications of shot noise, which is signal-dependent, to Hadamard multiplexing.

Very Low-Cost Sensing and Communication Using Bidirectional LEDs

TLDR
A novel microprocessor interface circuit is described which can alternately emit and detect light using only an LED, two digital I/O pins and a single current limiting resistor, suggesting that every LED connected to a microprocessor can be thought of as a wireless two-way communication port.