www.SwissFinanceInstitute.ch The Swiss Finance Institute (SFI) is a private foundation created in 2006 by Switzerland’s banking and finance community in cooperation with leading Swiss universities. The Institute supports and advances research, doctoral training, knowledge transfer and education in banking and finance. SFI also fosters interaction between researchers and practitioners with the g...

In this report we will discuss a simplified implementation of a shadow removal method. The key idea of the method is entropy minimization of the input image. An illuminant invariant image is computed and analyzed in order to extract shadow edges. The shadow edges are then feed into an image re-integration scheme that produces a colored intrinsic image that is free of dominant shadow. We discuss...

Search engines incur shadow costs whenever an advertisement negatively affects user experiences, which damages the search engine’s long-run revenue. We characterize the optimal mechanism for keyword advertising in a general framework that accommodates clickthrough rates and shadow costs that can differ across advertisers and positions. We show that shadow costs significantly affect how advertis...

Twenty-five years ago, Crow published the shadow volume approach for determining shadowed regions in a scene. A decade ago, Heidmann described a hardware-accelerated stencil bufferbased shadow volume algorithm. However, hardware-accelerated stenciled shadow volume techniques have not been widely adopted by 3D games and applications due in large part to the lack of robustness of described techni...

This paper describes the shadow puppet play which is a modelling technique using OpenGL in order to produce realtime shadow image. Besides, the novelty of this paper is to improve the interaction of shadow puppet play by applying both the texture mapping and the blending technique. The integration of these methods gives the special lighting effects that are vital for the quality improvement of ...

We consider the shadow minimization problem (SMP) for cartesian powers Pn of a Macaulay poset P . Our main result is a local-global principle with respect to the lexicographic order Ln. Namely, we show that under certain conditions the shadow of any initial segment of the order Ln for n ≥ 3 is minimal iff it is so for n = 2. These conditions include such poset properties as additivity , shadow ...

We present a hardware-accelerated method for rendering high quality, antialiased shadows using the shadow map approach. Instead of relying on dedicated hardware support for shadow map filtering, we propose a general rendering algorithm that can be used on most graphics workstations. The filtering method softens shadow boundaries by using a technique called percentage closer filtering which is c...

Since precise shadows can be generated in real-time, graphics applications often use the shadow volume algorithm. This algorithm was limited to manifold casters, but recently has been extended to general non-manifold casters with oriented triangles. We provide a further extension to general non-manifold meshes and an additional extension to shadows of transparent casters. To achieve these, we f...

Shadow fading is a well known problem in wireless sensor networks (WSN) and ad hoc networks since the communicating devices often are at street-level where the surrounding buildings often obstruct incoming radio waves. Therefore, accurately modeling shadow fading is an important requirement for the optimal design of such networks. Because the height of building is the most important parameter t...

This paper proposes a new shadow map technique termed trapezoidal shadow maps to calculate high quality shadows in real-time applications. To address the resolution problem of the standard shadow map approach, our technique approximates the eye’s frustum as seen from the light with a trapezoid to warp it onto a shadow map. Such a trapezoidal approximation, which may first seem straightforward, ...