Using synthetic objects, I investigate whether recognition performance is sensitive to different features of cast and attached shadows. Participants were required to recognise familiar objects presented to central vision while the presence, position and shape of cast and attached shadows were systematically manipulated. Costs in response time were found for naming objects in incongruent lightin...

Recently, real-time soft shadow research saw many important contributions from the class of soft shadow mapping algorithms, where approximate occluder geometry is reconstructed from a shadow map and backprojected onto the light source to determine its occlusion. An interesting approximation primitive is the microquad obtained from unprojected shadow map texel centers. However, its full potentia...

We propose two tampered image detection methods based on consistency of shadow. The first method is based on texture consistency of shadow for the first kind of splicing image, in which the shadow as well as main body is copied and pasted from another image. The suspicious region including shadow and nonshadow is first selected. Then texture features of the shadow region and the nonshadow regio...

Shadow banking is a term that came out of the financial crisis of 2007-2009. There is a belief that shadow banking was one of the crisis reasons. Because the excessive expansion of shadow banking endangers the financial stability of countries, this paper examines the impact of shadow banking on financial stability using data from 14 countries of the G20 during 2002-2018. We divided countries in...

This paper introduces a novel approach to rendering of highquality shadows in real-time. The contemporary approach to shadow rendering in real-time is shadow maps algorithm. The standard shadow maps suffer from discretization and aliasing due to the limited resolution of the shadow texture. Moreover, omnidirectional lights need additional treatment to work correctly, e.g. with dual-paraboloid s...

Shadow mapping is widely used in computer graphics for efficiently rendering shadows in real-time applications. Shadow maps cannot be filtered as regular textures, thus their limited resolution can cause severe shadow map discretization artifacts in the rendered images. To solve this problem, several techniques have been proposed, including variance shadow maps (VSM) and exponential shadow maps...

A shadow is created when an object lies in the path of a light source. Shadows are cast by the occluding object, or the object itself can be shaded; a phenomenon known as “self-shading”. Due to the difference between the light intensity reaching a shaded region and a directly lit region, shadows are often characterized by strong brightness gradients. While non-shadow regions are illuminated by ...

Shadows provide a strong source of information about the shapes of surfaces. We analyze the local geometric structure of shadow contours on piecewise smooth surfaces. Particular attention is paid to intrinsic shadows on a surface: that is, shadows created on a surface by the surface's own shape and placement relative to a light source. Intrinsic shadow contours provide useful information about ...

We consider visibility and shadow problems in the plane under static and dynamic conditions. We show that several problems in this domain are intimately related and that a careful formulation of the requirements of each problem can lead to a great deal of reuse in the implementation. This is of interest to the practitioner who may find it difficult to implement visibility and shadow algorithms ...