The goal of photometric stereo is to measure the precise surface normal a 3D object from observations with various shading cues. However, non-Lambertian surfaces influence measurement accuracy due irregular Despite deep neural networks have been employed simulate performance surfaces, error in specularities, shadows, and crinkle regions hard be reduced. In order address this challenge, we here ...

The commonly made assumption of Lambertian behaviour of fluorescence emission has been studied in solid amorphous material. A goniofluorometer capable of measurements in measurement geometries from 0 : 10 to 0 : 85 has been used for this purpose. The measurements indicate that the fluorescence emission from solid amorphous material is clearly non-Lambertian.

Light-emitting diodes (LEDs) will play a major role in future indoor illumination systems. In general, the generalized Lambertian pattern is widely used as the radiation pattern of a single LED. In this letter, we show that the illuminance distribution due to this Lambertian pattern, when projected onto a horizontal surface such as a floor, can be well approximated by a Gaussian function.

Beyond day glow highlighters and psychedelic black light posters, it has been estimated that fluorescence is a property exhibited by 20% of objects. When a fluorescent material is illuminated with a short wavelength light, it re-emits light at a longer wavelength isotropically in a similar manner as a Lambertian surface reflects light. This hitherto neglected property opens the doors to using f...

An analytical model characterizing the atmospheric radiance field over a non-Lambertian surface divides the radiation field into three components: unscattered radiance, single-scattering radiance, and multiple-scattering radiance. The first two components are calculated exactly. A δ-four-stream approximation is extended to calculate the azimuth-independent multiple-scattering radiance over a no...

The problem of light collection in random lasers (RLs) is addressed. As the radiation emitted by this system Lambertian due to its spatial incoherence, a device based on an ellipsoidal revolution mirror designed, developed, and tested order optimize harvesting RL. provides simple injection procedure energy at entrance multimode optical fiber. results obtained show that has net efficiency 35%, c...

Environment-mapped rendering of Lambertian isotropic surfaces is common, and a popular technique is to use a quadratic spherical harmonic expansion. This compact irradiance map representation is widely adopted in interactive applications like video games. However, many materials are anisotropic, and shading is determined by the local tangent direction, rather than the surface normal. Even for v...

Tensor displays are screens able to render a light field with correct depth perception without wearing glasses. Such devices have already been shown be accurately scene composed of Lambertian objects. This paper presents the model and prototyping tensor display three layers, using repurposed computer monitors, extends factorization method non-Lambertian Furthermore, we examine relation limitati...