Author Samuli Laine Title Efficient Physically-Based Shadow Algorithms This research focuses on developing efficient algorithms for computing shadows in computer-generated images. A distinctive feature of the shadow algorithms presented in this thesis is that they produce correct, physicallybased results, instead of giving approximations whose quality is often hard to ensure or evaluate. Light ...

In land monitoring applications, clouds and shadows are considered noise that should be removed as automatically and quickly as possible, before further analysis. This paper presents a method to detect clouds and shadows in Suomi NPP satellite’s VIIRS (Visible Infrared Imaging Radiometer Suite) satellite images. The proposed cloud and shadow detection method has two distinct features when compa...

This white paper defines the structure of Bond objects and introduces the shadows, an abstraction for networking. In the Bond system shadows are used to implement interobject communication, data transfer, remote execution and various distributed services. Locally managed collection of shadows are used to implement virtual networks. The communication of Bond objects is based on a message passing...

We define and study branched shadows of 4-manifolds as a combination of branched spines of 3-manifolds and of Turaev’s shadows. We use these objects to combinatorially represent 4-manifolds equipped with Spinc-structures and homotopy classes of almost complex structures. We then use branched shadows to study complex 4-manifolds and prove that each almost complex structure on a 4-dimensional han...

Lungs of unselected cadavers were fixed at necropsy using a formalin vapour technique. "Band shadows" were identified in the excised lungs and these were correlated with in vivo radiographs and with the morphological changes in the lung. Persistent shadows were produced by pulmonary infarction, subsegmental atelectasis, and septal fibrosis singly and in combination. Potentially transient shadow...

Segmentation is one of the most important steps leading to the analysis of images and image sequences. Its main goal is to divide an image into parts that have a strong correlation with objects or areas of the real world contained in the scene. A frequent occurrence in images is given by shadows. It is not difficult for human eyes to distinguish shadows from objects. However, identifying shadow...