scholarly journals Using the visibility complex for radiosity computation

1996 ◽  
pp. 177-190 ◽  
Author(s):  
Rachel Orti ◽  
Frédo Durand ◽  
Stéphane Rivière ◽  
Claude Puech
Keyword(s):  
Visibility Complex

scholarly journals The 3D visibility complex

2002 ◽  
Vol 21 (2) ◽  
pp. 176-206 ◽  
Author(s):  
Frédo Durand ◽  
George Drettakis ◽  
Claude Puech
Keyword(s):  
Visibility Complex

THE VISIBILITY COMPLEX

1996 ◽  
Vol 06 (03) ◽  
pp. 279-308 ◽  
Author(s):  
MICHEL POCCHIOLA ◽  
GERT VEGTER
Keyword(s):  
Pairwise Disjoint ◽  
Free Space ◽  
Cell Complex ◽  
Combinatorial Complexity ◽  
Working Space ◽  
Visibility Complex ◽  
Disjoint Convex ◽  
Regular Cell Complex

We introduce the visibility complex (a 2-dimensional regular cell complex) of a collection of n pairwise disjoint convex obstacles in the plane. It can be considered as a subdivision of the set of free rays (i.e., rays whose origins lie in free space, the complement of the obstacles). Its cells correspond to collections of rays with the same backward and forward views. The combinatorial complexity of the visibility complex is proportional to the number k of free bitangents of the collection of obstacles. We give an O(n log n+k) time and O(k) working space algorithm for its construction. Furthermore we show how the visibility complex can be used to compute the visibility polygon from a point in O(m log n) time, where m is the size of the visibility polygon. Our method is based on the notions of pseudotriangle and pseudo-triangulation, introduced in this paper.

Interactive ray tracing with the visibility complex

1999 ◽  
Vol 23 (5) ◽  
pp. 703-717 ◽  
Author(s):  
Franklin S Cho ◽  
David Forsyth
Keyword(s):  
Ray Tracing ◽  
Visibility Complex

scholarly journals Radiosity for dynamic scenes in flatland with the visibility complex

1996 ◽  
Vol 15 (3) ◽  
pp. 237-248 ◽  
Author(s):  
Rachel ORTI ◽  
Stephane RIVIERE ◽  
Fredo DURAND ◽  
Claude PUECH
Keyword(s):  
Dynamic Scenes ◽  
Visibility Complex

CLASSIFICATION OF REMOTE GEOGRAPHIC IMAGES

2020 ◽  
pp. 56-61
Author(s):  
Т. Kurach
Keyword(s):  
Information System ◽  
Temporal Resolution ◽  
Spectral Range ◽  
Image Construction ◽  
Degree Of Reduction ◽  
Image Characteristics ◽  
Iconic Image ◽  
Visibility Complex ◽  
Complex Mapping

The article considers the properties of remote geoimages. The properties of remote geoimages are singled out; the system ofclassification features is developed. The classification features of remote geoimages are divided into two groups: features of thewhole work and features of the iconic image. The first are the features that apply to the whole work, is visualized digital oranalogy display on any media. These include: recording information, repeatability, print format and image construction andproduction technology and registration and destination materials. The second group of features includes the features of thedirectly iconic image, what we can see in the picture. These are coverage of the territory, signs of image characteristics (spatial,spectral, radiometric and temporal resolution), detail, spectral range and degree of reduction. The following properties of remotegeoimages are distinguished: visibility, complex mapping of geosphere components, regular repeatability of shooting, remotegeneralization of the image, objectivity, efficiency, extraterritoriality, accessibility. The correspondence of the properties ofremote geoimages to their classification features is outlined. On the basis of the developed classification features theclassification of remote geoimages is created. The developed classification of remote geoimages according to certain features isthe most complete and systematized ordering of currently known types of remote geoimages. The developed classification willbe included in the analytical and information system for geo-iconic visualization and construction of geoimages with givenproperties. The classification is designed with the possibility of updating and supplementing, which provides for its furtherimprovement.

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