World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Polygonal Shapes Detection in 3D Models of Complex Architectures : Volume Xl-5/W4, Issue 1 (19/02/2015)

By Benciolini, G. B.

Click here to view

Book Id: WPLBN0004015502
Format Type: PDF Article :
File Size: Pages 6
Reproduction Date: 2015

Title: Polygonal Shapes Detection in 3D Models of Complex Architectures : Volume Xl-5/W4, Issue 1 (19/02/2015)  
Author: Benciolini, G. B.
Volume: Vol. XL-5/W4, Issue 1
Language: English
Subject: Science, Isprs, International
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus Publications
Historic
Publication Date:
2015
Publisher: Copernicus Publications, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Benciolini, G. B., & Vitti, A. (2015). Polygonal Shapes Detection in 3D Models of Complex Architectures : Volume Xl-5/W4, Issue 1 (19/02/2015). Retrieved from http://www.worldebookfair.org/


Description
Description: DICAM, University of Trento, 38123 Trento, Italy. A sequential application of two global models defined on a variational framework is proposed for the detection of polygonal shapes in 3D models of complex architectures. As a first step, the procedure involves the use of the Mumford and Shah (1989) 1st-order variational model in dimension two (gridded height data are processed). In the Mumford-Shah model an auxiliary function detects the sharp changes, i.e., the discontinuities, of a piecewise smooth approximation of the data. The Mumford-Shah model requires the global minimization of a specific functional to simultaneously produce both the smooth approximation and its discontinuities.

In the proposed procedure, the edges of the smooth approximation derived by a specific processing of the auxiliary function are then processed using the Blake and Zisserman (1987) 2nd-order variational model in dimension one (edges are processed in the plane). This second step permits to describe the edges of an object by means of piecewise almost-linear approximation of the input edges themselves and to detects sharp changes of the first-derivative of the edges so to detect corners. The Mumford-Shah variational model is used in two dimensions accepting the original data as primary input. The Blake-Zisserman variational model is used in one dimension for the refinement of the description of the edges.

The selection among all the boundaries detected by the Mumford-Shah model of those that present a shape close to a polygon is performed by considering only those boundaries for which the Blake-Zisserman model identified discontinuities in their first derivative. The output of the procedure are hence shapes, coming from 3D geometric data, that can be considered as polygons. The application of the procedure is suitable for, but not limited to, the detection of objects such as foot-print of polygonal buildings, building facade boundaries or windows contours. v The procedure is applied to a height model of the building of the Engineering Faculty of the University of Trento and to other data. The obtained results show the effectiveness of the variational methods in handling geometric data describing complex objects. The most original and innovative contributions of this work are:

- the consecutive and coordinated use of the proper variational models (of first and second order respectively) at first in two dimension and subsequently on the one dimensional sets arising in the first segmentation,

- the application to geometrical data that represent a quite complex architecture.


Summary
POLYGONAL SHAPES DETECTION IN 3D MODELS OF COMPLEX ARCHITECTURES

 

Click To View

Additional Books


  • Impact of the Atatürk Dam Lake on Agro-m... (by )
  • Automated Registration of Images from Mu... (by )
  • 3D Reconstruction of Buildings with Gabl... (by )
  • Comparison of Microwave Backscatter Anis... (by )
  • Labeling of Clusters Based on Critical A... (by )
  • Receiver Widelane Analysis and Its Effec... (by )
  • Comparision of Photogrammetric Point Clo... (by )
  • Tree Crown Delineation on Vhr Aerial Ima... (by )
  • Using Logit Model to Identify the Driver... (by )
  • A Robust Pct Method Based on Complex Lea... (by )
  • Superresolution Sar Imaging Algorithm Ba... (by )
  • A Multi-data Source and Multi-sensor App... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Fair are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.