Here, we present a systematic study about the effect of the pore length and its diameter on the specular reflection in nanoporous anodic alumina. As we demonstrate, the specular reflection can be controlled at will by structural tuning (i.e., by designing the pore geometry). This makes it possible to produce a wide range of Fabry-Pérot interferometers based on nanoporous anodic alumina, which a...

This paper present a pupil detection/segmentation algorithm for iris images based on Structure Tensor analysis. Eigenvalues of the structure tensor matrix have been observed to be high in pupil boundaries and specular reflections of iris images. We exploit this fact to detect the specular reflections region and the boundary of the pupil in a sequential manner. Experimental results are given usi...

The photometric sampling method extracts shape and reflectance properties of surfaces by using multiple illumination directions and a single viewing direction. We have previously proposed a recovering algorithm for smooth surfaces. One of the limitations of the previous algorithm is that it cannot recover the shape and roughness of specular lobe dominant surfaces. Surface reflection consists of...

The surface properties of objects, such as gloss, transparency and texture, provide important information about the material characteristics of objects in our visual environment. However, because there have been few reports on the neuronal responses to surface properties in primates, we still lack information about where and how surface properties are processed in the primate visual cortex. In ...

Computing radiosity is a computationally very expensive problem in computer graphics. Recent hierarchical methods have greatly speeded up the computation of first diffuse and now also specular radiosity. We present a parallel algorithm for computing both diffuse and specular radiosity together, and examine its performance in detail on cache-coherent shared address space multiprocessors. We comp...

In this paper, we present a method for recovery of shape and surface re ectance of specular object from color images taken with the light source rotating. The image sequence is taken with a xed camera while the light source is relatively rotating around the axis parallel to the optical axis of the camera. We derive the relationship between the body re ectance at every object surface point and t...

Detailed facial geometry is critical for the visual realism of face models in computer games, movies, and virtual reality applications. The existing face scanning methods, however, are either sacrificing resolution for real-time processing, or requiring expensive high-speed cameras. In this work we propose a new technique for real-time high-resolution facial scanning using spherical gradient il...

The increasing number of objects orbiting our planet necessitates the creation of sensing systems designed to determine the surface structure of such objects. One of the key challenges facing computer vision systems used in space is the presence of specular surfaces on most man-made orbital objects. Such surfaces present a challenge to conventional vision systems due to specular reflections, wh...