Real-time rendering of high-quality, anti-aliased shadows is a challenging problem in shadow mapping. Filtering the shadow map reduces aliasing, but artifacts are still visible for low-resolution shadow maps or small kernel sizes. Moreover, the existing techniques suffer from light leaking artifacts. Shadow silhouette recovery reduces perspective aliasing at the cost of large memory footprint a...

High-quality shadow anti-aliasing is a challenging problem in shadow mapping. Revectorization-based shadow mapping (RBSM) minimizes shadow aliasing by revectorizing the jagged shadow edges generated with shadow mapping, keeping low memory footprint and real-time performance for the shadow computation. However, the current implementation of RBSM is not so well optimized because its visibility fu...

Abstract To study the power propagation of wind turbines in doubly-fed unit and output oscillation characteristics after transformation. Firstly, damping was changed when velocity lower than rated higher respectively, considering tower shadow effect shear, were studied. Finally, modeling simulation carried out on PSCAD/EMTDC platform. Through analysis fluctuation spectrum change unit, it is con...

Shadow Economies and Corruption All Over the World: What Do We Really Know? Estimations of the size and development of the shadow economy for 145 countries, including developing, transition and highly developed OECD economies over the period 1999 to 2003 are presented. The average size of the shadow economy (as a percent of “official” GDP) in 2002/03 in 96 developing countries is 38.7%, in 25 t...

Many hearing-impaired listeners struggle to localize sounds due to poor availability of binaural cues. Listeners with a cochlear implant and a contralateral hearing aid - so-called bimodal listeners - are amongst the worst performers, as both interaural time and level differences are poorly transmitted. We present a new method to enhance head shadow in the low frequencies. Head shadow enhanceme...

The radiation pattern of a focused transducer is reexamined. The radiation field is divided into an illuminated zone and a shadow zone. A numerically convergent solution of the pressure distribution in terms summations of Bessel functions is provided. This solution is computationally more advantageous than earlier results where a double or single integral in the complex plane is required. The p...

— This paper describes an efficient algorithm to model the light attenuation due to a participating media with low albedo. Here, we consider the light attenuation along a ray, as well as the light attenuation emanating from a surface. The light attenuation is modeled using a splatting volume renderer for both the viewer and the light source. During the rendering, a 2D shadow buffer accumulates ...

Recently, Kuo-Liang Chung presented an efficient algorithm uses the ratio of hue over intensity as the parameter to determine the coarse shadow map and then the local thresholding method (STS) in which it needs the different threshold levels which is comparatively more time consuming (and if the threshold is not proper then the resultant image is not the desired image, because threshold determi...

A novel approach to shadow detection is presented in this paper. The method is based on the use of invariant color models to identify and to classify shadows in digital images. The procedure is divided into two levels: first, shadow candidate regions are extracted; then, by using the invariant color features, shadow candidate pixels are classified as self shadow points or as cast shadow points....

The performance of the Frequency Division Duplex (FDD) mode of the Code Division Multiple Access (CDMA) based Universal Mobile Telecommunication System (UMTS) is investigated. The new call blocking and call dropping probabilities, the probability of low-quality access as well as the required average transmit power are quantified both with and without the assistance of adaptive antenna arrays as...