In augmented virtuality which virtualizes real objects to construct a mixed reality environment, it is important to estimate object surface reflectance properties to render objects under arbitrary illumination conditions. The authors developed a method to estimate reflectance properties of object surfaces densely. However, it was difficult to estimate surface reflectance properties faithfully f...

BACKGROUND AND OBJECTIVE To explore whether reflectance spectroscopy can differentiate normal ovary, benign neoplasms, and ovarian cancer. STUDY DESIGN/MATERIALS AND METHODS Reflectance spectra (390-600 nm) were measured at three source-detector separations (SDS) in vivo at 64 sites in 16 patients undergoing oophorectomy. Parameters with largest statistical differences were identified. Based ...

In this study, we investigate the reflectance property of the cylinder, right circular cone, and square pyramid shapes of silicon nitride (Si3N4) subwavelength structure (SWS) with respect to different designing parameters. In terms of three critical factors, the reflectance for physical characteristics of wavelength dependence, the reflected power density for real power reflection applied on s...

For inhomogeneous materials, the standard reflectance model suggests that under all viewing geometries surface reflectance functions can be described as the sum of a constant function of wavelength (specular) and a diffuse function that is characteristic of the material. As the viewing geometry varies, the relative contribution of these two terms varies. In a previous study [J. Opt. Soc. Am. A ...

In this paper we extend the application of neural network-based photometric stereo founded on the principle of empirical photometric stereo to color images proposing a method for computing both the normal vectors of a target object and its color reflectance coefficients. This method is able to render objects that have non-Lambert reflectance properties without using any parametric reflectance f...

The shape and reflectance of complex objects, for use in computer graphics applications, cannot always be acquired using specialized equipment due to cost or pratical considerations. We want to provide an easy and cost-effective way for the approximate recovery of both shape and spatially-varying reflectance of objects using commodity hardware. In this paper, we present an image-based technique...

Determining the compositional properties of surfaces in the environment is an important visual capacity. One such property is specular reflectance, which encompasses the range from matte to shiny surfaces. Visual estimation of specular reflectance can be informed by characteristic motion profiles; a surface with a specular reflectance that is difficult to determine while static can be confident...

I propose a model for predicting the total reflectance of color halftones printed on paper incorporating fluorescent brighteners. The total reflectance is modeled as the additive superposition of the relative fluorescent emission and the pure reflectance of the color print. The fluorescent emission prediction model accounts for both the attenuation of light by the halftone within the excitation...

PURPOSE To quantify the reflectance of the swine fundus as a function of illumination angle and wavelength using a novel technique of intravitreal illumination. METHODS Enucleated swine eyes were illuminated with a scanning monochromator coupled to a fiber-optic probe placed in the vitreous at several locations. Intravitreal illumination was used to reduce the effects of extraneous reflection...

Photometric stereo is a method of reconstructing a surface from the amount of light reflected by it. This is done by using prior knowledge of the surface reflectance to estimate the surface normal at all visible points. The theory of photometric stereo has been extensively developed for surfaces and illumination geometries that give rise to a Lambertian reflectance map. For non-Lambertian refle...