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revision 1.91 by tjl, Mon Mar 31 14:06:02 2003 UTC revision 1.92 by tjl, Mon Mar 31 14:10:42 2003 UTC
# Line 702  in the texture ``channel''. Line 702  in the texture ``channel''.
702  % relatively small basis size, not to have too many features. XXX why?  % relatively small basis size, not to have too many features. XXX why?
703    
704    
705    An important point is generating the backgrounds is that
706    the texture appearance should have no correlation with any attribute
707    or content of the document
708    so that the textures of any two important files
709    are similar only by chance.
710    Having any semantics encoded in the texture
711    would prohibit orthogonal structures with differing semantics
712    of the same content.
713    
714  \section{Hardware-accelerated implementation}  \section{Hardware-accelerated implementation}
715    
716  In this section, we discuss our hardware-accelerated implementation  In this section, we discuss our hardware-accelerated implementation
# Line 1175  if the gamma is correct but the textures Line 1184  if the gamma is correct but the textures
1184  \end{figure*}  \end{figure*}
1185    
1186  \section{Experiences, evaluation}  \section{Experiences, evaluation}
 It can be argued that  
 the backgrounds clutter the display  
 visually, making the user interface more confusing,  
 and may not even be helpful.  
 Indeed, many aspects of the system are a compromise between  
 recognizability and other goals such as readability, rendering  
 performance, or user comfortability.  
   
 Overall, we feel that the backgrounds can greatly improve user orientation,  
 enabling more efficient views to hyperstructured content, and  
 therefore the benefits outweigh the costs.  
1187  In the following, we evaluate the implications and tradeoffs  In the following, we evaluate the implications and tradeoffs
1188  of different  of different
1189  aspects in the use of unique backround textures.    aspects in the use of unique backround textures.  
1190    
1191  \subsection{Overall appearance of the resulting textures}  \subsection{Overall appearance of the resulting textures}
1192    
 The most important point is generating the backgrounds is that  
 the texture appearance should have no correlation with any attribute  
 or content of the document  
 so that the textures of any two important files  
 are similar only by chance.  
 Having any semantics encoded in the texture  
 would prohibit orthogonal structures with differing semantics  
 of the same content.  
   
1193  %The background textures should be be recognizable at different scales.  %The background textures should be be recognizable at different scales.
1194  Although texture perception is scale-independent to some extent,  Although texture perception is scale-independent to some extent,
1195  the display resolution and certain spatial interactions  the display resolution and certain spatial interactions
# Line 1216  We have not tried to attain infinite zoo Line 1205  We have not tried to attain infinite zoo
1205  with the current implementation,  with the current implementation,
1206  but only the more modest goal of zooming within a range  but only the more modest goal of zooming within a range
1207  that would be reasonable for a single PDF document,  that would be reasonable for a single PDF document,
1208  i.e., approximately 100-fold  i.e., approximately 10-fold
1209  difference between mininum and maximum zoom.  difference between mininum and maximum zoom.
1210  % This is in line with our  % This is in line with our
1211  % intended use, since it would be unreasonable  % intended use, since it would be unreasonable
# Line 1608  distinct symbols can be used... Line 1597  distinct symbols can be used...
1597  Visualizing a discrete variable with unordered values  Visualizing a discrete variable with unordered values
1598    
1599    
1600    It can be argued that
1601    the backgrounds clutter the display
1602    visually, making the user interface more confusing,
1603    and may not even be helpful.
1604    Indeed, many aspects of the system are a compromise between
1605    recognizability and other goals such as readability, rendering
1606    performance, or user comfortability.
1607    
1608    Overall, however, we feel that the backgrounds can greatly improve user orientation,
1609    enabling more efficient views to hyperstructured content, and
1610    therefore the benefits outweigh the costs.
1611    
1612    
1613  \section{Acknowledgments}  \section{Acknowledgments}
1614    
1615  The authors would like to thank John Canny,  The authors would like to thank John Canny,

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