The imprecision of sketches


In the first chapter, we learned that sketches raise the problem of distinguishing necessary from accidental properties, necessary properties being crucial for the purpose of sketch comparisons. In our thesis we propose to recognise them using perceptually or mentally aided distinctions. The first step in achieving this is to get a general idea of what representations are based on such distinctions. Several representations of perceptually aided spatial relations have been proposed in the field of qualitative spatial reasoning. But before we come to those representations we need to work out what is relevant when comparing sketches. It is primarily the imprecision of sketches that makes them difficult to handle. Hence, it is helpful to provide a framework for distinguishing different levels of spatial precision. We are then able to figure out where present approaches lack appropriate concepts for dealing with imprecise shape information such as that found in sketches.


Topological Relation Shape Property Polygonal Approximation Spatial Precision Interval Relation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Deutscher Universitäts-Verlag | GWV Fachverlage GmbH, Wiesbaden 2007

Personalised recommendations