Shadows can be occurred when an object partially or totally obstructs direct light from a source of illumination. Shadows have their-own merits and demerits. Sometimes it will provide useful information about objects. But the presence of shadows may reduce the reliability of many computer vision algorithms, including segmentation, object detection, tracking, etc. Therefore, to improve the perfo...

In this paper, we investigate the light trajectories and shadow properties in rotating version of null naked singularity (NNS) spacetime which is derived using Newman- Janis algorithm without complexification method. We discuss some geometrical causal structure Rotating Naked Singularity (RNS) spacetime. The gravitational lensing a analyzed, results are compared to those Kerr black hole. case h...

The scattering far zone for light transmitted through a sphere following p - 1 internal reflections by a family of near-grazing incident rays is subdivided into a lit region and a shadow region. The sharpness of the ray theory transition between the lit and the shadow regions is smoothed in wave theory by radiation shed by electromagnetic surface waves. It is shown that when higher-order terms ...

The photon map algorithm provides a number of advantages for fast global illumination algorithms. In order to calculate the illumination at each point in a scene, the photon density needs to be estimated. Standard estimation methods will have problems with typical architectural scenes, as walls and corners will lead to undesirable light and shadow leaks. We introduce a new method for estimating...

This research features parameterized depth edge detection using structured light imaging that exploits a single color stripes pattern and an associated binary stripes pattern. By parameterized depth edge detection, we refer to the detection of all depth edges in a given range of distances with depth difference greater or equal to a specific value. While previous research has not properly dealt ...

We present a real-time rendering algorithm that generates soft shadows of dynamic scenes using a single light sample. As a depth-map algorithm it can handle arbitrary shadowed surfaces. The shadow-casting surfaces, however, should satisfy a few geometric properties to prevent artifacts. Our algorithm is based on a bivariate attenuation function, whose result modulates the intensity of a light c...

Opacity shadow maps approximate light transmittance inside a complex volume with a set of planar opacity maps. A volume made of standard primitives (points, lines, and polygons) is sliced and rendered with graphics hardware to each opacity map that stores alpha values instead of traditionally used depth values. The alpha values are sampled in the maps enclosing each primitive point and interpol...