Acquisition of hyperspectral imagery (HSI) from cameras mounted on terrestrial platforms is a relatively recent development that enables spectral analysis of dominantly vertical structures. Although solar shadowing is prevalent in terrestrial HSI due to the vertical scene geometry, automated shadow detection and restoration algorithms have not yet been applied to this capture modality. We inves...

Detecting shadows is needed for object detection methods because shadows often have a harmful effect on the result. Shadow detection methods based on shadow models are proposed. The shadow model should be updated to detect shadows which are not included in the learning data. In this paper, a new method for updating the shadow model for shadow detection is proposed. The proposed method models sh...

This material consists of 3 parts: 1) Comparison of shadow detection on a challenging case; 2) Applications of our work; 3) Extended visual comparisons of our shadow removal results. We plan to officially release our data set in 2014. To allow for repeatable evaluation for future comparison, our P-code, the user input data, output data and the scripts for ground truth evaluation and quantitativ...

This paper presents a model of shadow banking in which the shadow and the traditional banking systems share a symbiotic relationship. The analysis shows that competition with an opaque and fragile shadow bank can bene…t the traditional bank, especially when the traditional bank faces liquidity risk stemming from collective actions by investors, such as runs. The opacity and fragility of the sha...

When detecting moving shadow for video-based virtual reality interaction (VBVRI), we need not concern the original moving object that casts the shadow. It is based on this feature of application that a novel algorithm of moving shadow detection is proposed in this paper, which primarily introduces a two-step shadow discriminator and an improvement upon the classical Gaussian Mixture Model (GMM)...

The latest empirical results of the size of the shadow economy in 18 OECD countries are presented, using the currency demand approach to calculate the shadow economy over time. The results indicate a strong increase in the size of the shadow economy, over the period 1960 to 1998 and for 15 of the 18 investigated OECD-countries the size of the shadow economy is more than 13 % of the GNP for the ...

-In this paper we proposed a new and simple method in order to extract the shadow area, by using the homomorphic system to emphasize more on illumination and reflection components of image gray-level value separately. In this new method all analysis carried out in the HSV color space using Value component as darkness / brightness of a color to improve the accuracy in detecting shadow area. The ...

We used a visual-search method to investigate the role of shadows in the rapid discrimination of scene properties. Targets and distractors were light or dark 2-D crescents of identical shape and size, on a mid-grey background. From the dark stimuli, illusory 3-D shapes can be created by blurring one arc of the crescent. If the inner arc is blurred, the stimulus is perceived as a curved surface ...

This work should give an overview of various shadow techniques used in real-time rendering. Proper shadows are a crucial part of realistic looking scenes and therefore a huge research field in computer graphics. We will focus on the two major shadowing techniques shadow volumes and shadow mapping, including most popular rendering approaches, whereby the most practical approaches should be point...

Two of the best methods to recognize silhouette to create real-time volume shadow in virtual environment are described in this paper. Volume shadow algorithm is implemented for virtual environment with moveable illuminated light source. Triangular method and the Visible-non visible method are introduced. The recent traditional silhouette detection and implementation techniques used in volume sh...