Cumincad : CUMINCAD Papers : Search Results

CumInCAD is a Cumulative Index about publications in Computer Aided Architectural Design
supported by the sibling associations ACADIA, CAADRIA, eCAADe, SIGraDi, ASCAAD and CAAD futures

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_id	e981
authors	Scott, David S. and Iyengar, S. Sitharama
year	1986
title	TID - A Translation Invariant Data Structure for Storing Images
source	Communications of the ACM. May, 1986. vol. 29: pp. 418-429 : some ill. includes bibliography
summary	There are a number of techniques for representing pictorial information, among them are borders, arrays, and skeletons. Quadtrees are often used to store black and white picture information. A variety of techniques have been suggested for improving quadtrees, including linear quadtrees, QMAT's (quadtree medial axis transform), forests of quadtrees, etc. The major purpose of these improvements is to reduce the storage required without greatly increasing the processing costs. All of these methods suffer from the fact that the structure of the underlying quadtree can be very sensitive to the placement of the origin. This paper discusses a translation invariant data structure (which is named TID) for storing and processing images based on the medial axis transform of the image that consists of all the maximal black squares contained in the image. Also discussed is the performance of TID with other existing structures such as QMATs, forests of quadtrees, and normalized quadtrees. Some discussion on the union and intersection of images using TID is included
keywords	data structures, representation, image processing, quadtree
series	CADline
last changed	2003/06/02 13:58

_id	8e02
authors	Brown, A.G.P. and Coenen, F.P.
year	2000
title	Spatial reasoning: improving computational efficiency
source	Automation in Construction 9 (4) (2000) pp. 361-367
summary	When spatial data is analysed the result is often very computer intensive: even by the standards of contemporary technologies, the machine power needed is great and the processing times significant. This is particularly so in 3-D and 4-D scenarios. What we describe here is a technique, which tackles this and associated problems. The technique is founded in the idea of quad-tesseral addressing; a technique, which was originally applied to the analysis of atomic structures. It is based on ideas concerning Hierarchical clustering developed in the 1960s and 1970s to improve data access time [G.M. Morton, A computer oriented geodetic database and a new technique on file sequencing, IBM Canada, 1996.], and on atomic isohedral (same shape) tiling strategies developed in the 1970s and 1980s concerned with group theory [B. Grunbaum, G.C. Shephard, Tilings and Patterns, Freeman, New York, 1987.]. The technique was first suggested as a suitable representation for GIS in the early 1980s when the two strands were brought together and a tesseral arithmetic applied [F.C. Holdroyd, The Geometry of Tiling Hierarchies, Ars Combanitoria 16B (1983) 211–244.; S.B.M. Bell, B.M. Diaz, F.C. Holroyd, M.J.J. Jackson, Spatially referenced methods of processing raster and vector data, Image and Vision Computing 1 (4) (1983) 211–220.; Diaz, S.B.M. Bell, Spatial Data Processing Using Tesseral Methods, Natural Environment Research Council, Swindon, 1986.]. Here, we describe how that technique can equally be applied to the analysis of environmental interaction with built forms. The way in which the technique deals with the problems described is first to linearise the three-dimensional (3-D) space being investigated. Then, the reasoning applied to that space is applied within the same environment as the definition of the problem data. We show, with an illustrative example, how the technique can be applied. The problem then remains of how to visualise the results of the analysis so undertaken. We show how this has been accomplished so that the 3-D space and the results are represented in a way which facilitates rapid interpretation of the analysis, which has been carried out.
series	journal paper
more	http://www.elsevier.com/locate/autcon
last changed	2003/05/15 21:22

_id	c211
authors	Brown, A.G.P.
year	1986
title	A Year's Experience with CATIA and CADAM
source	Teaching and Research Experience with CAAD [4th eCAADe Conference Proceedings] Rome (Italy) 11-13 September 1986, pp. 7-16
doi	https://doi.org/10.52842/conf.ecaade.1986.007
summary	In June 1985 Liverpool University obtained the CAD packages CATIA and CADAM to run on its IBM 4341 mainframe. The following is a brief description of the investigations which have taken place in the first year of their implementation to gauge the usefulness of these packages, principalLy as CAAD teaching aids. Neither CATIA nor CADAM were initially developed as architectural design aids so a matter of initial concern was their appropriateness for teaching (and possibly research) in an architectural environment.
series	eCAADe
email
last changed	2022/06/07 07:54

_id	2e5e
authors	Brown, G.Z. and Novitski, Barbara-Jo
year	1986
title	Nurturing Design Intuition in Energy Software
source	ACADIA Workshop ‘86 Proceedings - Houston (Texas - USA) 24-26 October 1986, pp. 183-189
doi	https://doi.org/10.52842/conf.acadia.1986.183
summary	This paper discusses educational software under development at the University of Oregon which helps to alleviate the difficulties of integrating technical considerations in the creative architectural design process.
series	ACADIA
email
last changed	2022/06/07 07:54

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