Linguistic spatial relations of three dimensional scenes using SIFT keypoints

2006 ◽  
Author(s):  
R.H. Luke ◽  
S.N. Blisard ◽  
J.M. Keller ◽  
M. Skubic
Keyword(s):  
Three Dimensional ◽  
Spatial Relations ◽  
Sift Keypoints

scholarly journals Detection of Symmetry and Repetition in One and Two Objects

2009 ◽  
Vol 56 (1) ◽  
pp. 5-17 ◽  
Author(s):  
Arno Koning ◽  
Johan Wagemans
Keyword(s):  
Three Dimensional ◽  
Intrinsic Property ◽  
Spatial Relations ◽  
Two Dimensional ◽  
Single Object ◽  
Ground Segmentation ◽  
Matching Strategy ◽  
The One

Symmetry is usually easier to detect within a single object than in two objects (one-object advantage), while the reverse is true for repetition (two-objects advantage). This interaction between regularity and number of objects could reflect an intrinsic property of encoding spatial relations within and across objects or it could reflect a matching strategy. To test this, regularities between two contours (belonging to a single object or two objects) had to be detected in two experiments. Projected three-dimensional (3-D) objects rotated in depth were used to disambiguate figure-ground segmentation and to make matching based on simple translations of the two-dimensional (2-D) contours unlikely. Experiment 1 showed the expected interaction between regularity and number of objects. Experiment 2 used two-objects displays only and prevented a matching strategy by also switching the positions of the two objects. Nevertheless, symmetry was never detected more easily than repetition in these two-objects displays. We conclude that structural coding, not matching strategies, underlies the one-object advantage for symmetry and the two-objects advantage for repetition.

scholarly journals Intact Planar Abstraction of Buildings via Global Normal Refinement from Noisy Oblique Photogrammetric Point Clouds

2018 ◽  
Vol 7 (11) ◽  
pp. 431 ◽  
Author(s):  
Qing Zhu ◽  
Feng Wang ◽  
Han Hu ◽  
Yulin Ding ◽  
Jiali Xie ◽  
...  
Keyword(s):  
Global Optimization ◽  
Three Dimensional ◽  
Region Growing ◽  
Point Clouds ◽  
Spatial Relations ◽  
Global Scale ◽  
Surface Boundary ◽  
Planar Surfaces ◽  
Normal Vectors ◽  
Almost All

Oblique photogrammetric point clouds are currently one of the major data sources for the three-dimensional level-of-detail reconstruction of buildings. However, they are severely noise-laden and pose serious problems for the effective and automatic surface extraction of buildings. In addition, conventional methods generally use normal vectors estimated in a local neighborhood, which are liable to be affected by noise, leading to inferior results in successive building reconstruction. In this paper, we propose an intact planar abstraction method for buildings, which explicitly handles noise by integrating information in a larger context through global optimization. The information propagates hierarchically from a local to global scale through the following steps: first, based on voxel cloud connectivity segmentation, single points are clustered into supervoxels that are enforced to not cross the surface boundary; second, each supervoxel is expanded to nearby supervoxels through the maximal support region, which strictly enforces planarity; third, the relationships established by the maximal support regions are injected into a global optimization, which reorients the local normal vectors to be more consistent in a larger context; finally, the intact planar surfaces are obtained by region growing using robust normal and point connectivity in the established spatial relations. Experiments on the photogrammetric point clouds obtained from oblique images showed that the proposed method is effective in reducing the influence of noise and retrieving almost all of the major planar structures of the examined buildings.

Fuzzy Three-Dimensional Voronoi Diagram and its Application to Geographical Data Analysis

2012 ◽  
Vol 16 (2) ◽  
pp. 191-198
Author(s):  
Mian Dai ◽  
◽  
Fangyan Dong ◽  
Kaoru Hirota
Keyword(s):  
Voronoi Diagram ◽  
Three Dimensional ◽  
Spatial Relation ◽  
Spatial Relations ◽  
Mountainous Area ◽  
Two Dimensional ◽  
Spatial Direction ◽  
Geographical Data ◽  
Direction Relations ◽  
Complex Boundaries

A concept of fuzzy three-dimensional Voronoi Diagram is presented for spatial relations analysis of real world three-dimensional geographical data, where it is an extension of well known two-dimensional Voronoi Diagram to three-dimensional representation with uncertain spatial relation information in terms of fuzzy set. It makes possible to analyze quantitatively complex boundaries of geographically intricate areas, to give human friendly fuzzy explanation of determining three-dimensional directions, and to express uncertain spatial relations by precise unified fuzzy description. It is applied to decide spatial direction relations of artificial geographicalmountain data, which includes 8 spatial directions with at most 60 relative direction relations, and it leads to detect threedimensional directions whereas the expression of traditional 4 directions and 12 relative directions indicate two-dimensional directions only. The proposed concept aims to discriminate neighbors’ class relations and spatial-temporal changes of specially appointed objects, and also aims to be a tool to achieve the intellective extraction and analysis of geographical data of a mountainous area located in northeast China.

Effect of Fixation Point Distances on Allocation of Attention in Real Three-Dimensional Space

2009 ◽  
Vol 109 (1) ◽  
pp. 327-337 ◽  
Author(s):  
Takahiko Kimura ◽  
Toshiaki Miura ◽  
Kazumitsu Shinohara
Keyword(s):  
Perceptual Load ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Spatial Relations ◽  
Task Demand ◽  
Attentional Resources ◽  
Spatial Cuing ◽  
Point Distance ◽  
Three Dimensional Space

Although variation in spatial relations between observer and objects is important when attention functions in three-dimensional space, the effects of changes in spatial relations on attention in real three-dimensional space are still unclear. In Exp. 1, the effects of varying distances of the fixation point on attention in a spatial cuing paradigm were investigated. In Exp. 2, the effects of increase in task demand were examined by making observers detect a blinking fixation point, while performing the same task as in Exp. 1. In both experiments, attention could be manipulated by a precue when the fixation-point distance changed from trial to trial, and in Exp. 2 distribution of attention was manipulated by perceptual load. These findings together indicate that allocation of attentional resources in three-dimensional space varies by task demand.

A Three Layered Approach for General Image Retrieval

2011 ◽  
pp. 78-83
Author(s):  
Richard Chbeir ◽  
Youssef Amghar ◽  
Andre Flory
Keyword(s):  
Image Retrieval ◽  
Knowledge Base ◽  
Three Dimensional ◽  
Spatial Relations ◽  
Application Domain ◽  
Global Approach ◽  
Retrieval Process ◽  
Retrieval Processes ◽  
Indexing And Retrieval ◽  
Layered Approach

Several approaches are proposed for retrieving images. Each of them describes image according to application domain requirements. No global approach exists to resolve retrieving image in complex domains (as medical one), in which content is multifaceted. A framework to retrieve medical images is presented. In this paper, we expose our three-dimensional approach applied to medical domain, and required elements for both knowledge base and retrieval process. The proposed approach, built on multifaceted aspect, offers all possibilities to describe image within multifaceted content (context, physical and semantic). Conceptual relations are presented for designing knowledge base for coherent and efficient indexing and retrieval processes. Required spatial relations of processes are also exposed.

Parallel Visual Coding in Three Dimensions

Perception ◽  
1994 ◽  
Vol 23 (4) ◽  
pp. 453-470 ◽  
Author(s):  
Glyn W Humphreys ◽  
Nicole Keulers ◽  
Nick Donnelly
Keyword(s):  
Three Dimensional ◽  
Spatial Relations ◽  
Image Features ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Linear Perspective ◽  
Size Difference ◽  
The Real ◽  
Local Background ◽  
Real Size

Evidence from visual-search experiments is discussed that indicates that there is spatially parallel encoding based on three-dimensional (3-D) spatial relations between complex image features. In one paradigm, subjects had to detect an odd part of cube-like figures, formed by grouping of corner junctions. Performance with cube-like figures was unaffected by the number of corner junctions present, though performance was affected when the corners did not configure into a cube. It is suggested from the data that junctions can be grouped to form 3-D shapes in a spatially parallel manner. Further, performance with cube-like figures was more robust to noncollinearity between junctions than was performance when junctions grouped to form two-dimensional planes. In the second paradigm, subjects searched for targets defined by their size. Performance was affected by a size illusion, induced by linear-perspective cues from local background neighbourhoods. Search was made more efficient when the size illusion was consistent with the real size difference between targets and nontargets, and it was made less efficient when the size illusion was inconsistent with the real size difference. This last result occurred even though search was little affected by the display size in a control condition. We suggest that early, parallel visual processes are influenced by 3-D spatial relations between visual elements, that grouping based on 3-D spatial relations is relatively robust to noncollinearity between junctions, and that, at least in some circumstances, 3-D relations dominate those coded in two-dimensions.

The role of the Internal courtyard in organizing the function and shaping architecture

2020 ◽  
Vol 27 (2) ◽  
pp. 135-146
Author(s):  
Basim Hasan Almajidi ◽  
Tuqa Mahmood Hameed
Keyword(s):  
Spatial Structure ◽  
Interior Design ◽  
Spatial Organization ◽  
Three Dimensional ◽  
Spatial Relations ◽  
Architectural Form ◽  
Formation Function ◽  
The One ◽  
Architectural Characteristics

Despite the development of architecture, the courtyard remained one of the most important methods of preserving the privacy and suitability of the environmental and social aspects as well as its role in the process of regulating the spatial relations between the mass and the vacuum, highlighting the importance, especially in light of the increasing seriousness of slums in the design and neglect of its role in the architectural form and reflections of the shape of the courtyard In the form of the composition of the building, thus the problem of the search was (Lack of cognitive perception available on the role of the internal courtyard in the organization of the function of architecture and its implications at the level of bilateral and three-dimensional mass configuration). And the approach of research to clarify the architectural characteristics of the structured internal courtyard and its functions and strategy as well as the patterns of spatial structure through the construction of knowledge framework, and then a comprehensive theoretical framework of the internal courtyard structured derived from the architectural proposals to reflect the final in four main words: The architectural characteristics of the structured inner courtyard, the spatial structure patterns of the structured inner courtyard, the functions of the organized inner courtyard, and the structured interior design strategy. It has been applied to selected projects to clarify the extent to which these indicators are achieved and to reach conclusions, which showed the existence of a relationship between the two (vacuum and mass) on the one hand and between the two (vacuum, and spatial organization of the spaces) on the other hand, and three aspects: Mass formation, function formation, and movement configuration", reflecting the internal courtyard structure in terms of simplicity or complexity.

Three-Dimensional CT Imaging with Volume Rending of Separating Fusing, Opacifying and False-Coloring Technique

2013 ◽  
Vol 423-426 ◽  
pp. 2606-2609 ◽  
Author(s):  
Shao Yin Duan ◽  
Hua Zhong ◽  
Feng Ye
Keyword(s):  
Volume Rendering ◽  
Three Dimensional ◽  
Spatial Relations ◽  
Ct Imaging ◽  
Imaging Diagnosis ◽  
Surgical Operation ◽  
Anatomical Structures ◽  
Anatomical Basis ◽  
Ct Volume

This paper proposes a three-dimensional CT imaging (3DCT) method to show the anatomical structures. With the CT volume scanning data, 3DCT imaging with volume rendering of separating, fusing, opacifying and false-coloring (SFOF-VR) techniques was done on the workstation. SFOF-VR, with separately and jointly showing the complicated anatomy and their spatial relations, is valuable in finding the variations of bone, artery and vein, and diagnosing their diseases. When comparing with routine volume rendering (R-VR), SFOF-VR provides more clear and direct anatomical basis for imaging diagnosis and surgical operation.

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