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revision 1.121 by tjl, Mon Mar 31 18:44:16 2003 UTC revision 1.122 by tjl, Mon Mar 31 19:07:04 2003 UTC
# Line 585  the results from the different pre-atten Line 585  the results from the different pre-atten
585  such as different shapes and colors,  such as different shapes and colors,
586  are combined to form an abstract \emph{feature vector}  are combined to form an abstract \emph{feature vector}
587  (see Fig.~\ref{fig-perceptual}).  (see Fig.~\ref{fig-perceptual}).
588    As seen for example in \cite{olson02vstm}, only
589    a limited
590    number of different features detected can be grouped into
591    objects, indicating that the spatial resolution of the feature
592    vector is quite low - as a well-known example, conjunction
593    coding is not preattentive - red squares are hard to find among
594    green squares and red and green circles.
595    
596  The feature vector is then used to compute  The feature vector is then used to compute
597  which concept the particular  which concept the particular
598  input corresponds to by comparing it to memorized models  input corresponds to by comparing it to memorized models
599  in a simple perceptron-like  in a simple perceptron-like
600  fashion\cite{rosenblatt62neurodynamics,widrow60adaptive}.  fashion\cite{rosenblatt62neurodynamics,widrow60adaptive}.
601  This configuration is commonly used in neural computation.  This configuration is commonly used in neural computation.
 As seen for example in \cite{olson02vstm}, only a limited  
 number of different features detected can be grouped into  
 objects, ... XXX SO!!! JVK  
602    
603  \begin{figure}  \begin{figure}
604  \centering  \centering
# Line 1272  the current system is quite satisfactory Line 1277  the current system is quite satisfactory
1277    
1278  \subsection{Text readability}  \subsection{Text readability}
1279    
 JVK: KÄYTÄ viitettä  
   
1280  %XXX: http://www.opticsexpress.org/abstract.cfm?URI=OPEX-6-4-81  %XXX: http://www.opticsexpress.org/abstract.cfm?URI=OPEX-6-4-81
1281  % "Background variation effects were only seen when the text contrast was low"  % "Background variation effects were only seen when the text contrast was low"
1282  % "[...] several studies have indicated that there is a low correlation between  % "[...] several studies have indicated that there is a low correlation between
1283  %  subjective preference for text displays and empirical measures of their  %  subjective preference for text displays and empirical measures of their
1284  %  readability."  %  readability."
1285    
 Experiments in \cite{scharff00discriminability} indicate, that  
 a background texture only affects readability when the text contrast is low.  
 Also, subjective assesments of readibilty often have low correlation  
 with objective measurements\cite{scharff00discriminability}.  
 XXX  
   
1286  The most common criticism against this work concerns  The most common criticism against this work concerns
1287  text readability.  text readability.
1288  Indeed, one of the most difficult aspects of this work {\em was} tuning the random  Indeed, one of the most difficult aspects of this work {\em was} tuning the random
1289  color selection to produce acceptable results.  color selection to produce acceptable results.
1290  However, in the current version, even relatively small text is quite legible on the backgrounds.  However, in the current version, even relatively small text is quite legible on the backgrounds.
1291    
1292    Experiments in \cite{scharff00discriminability} indicate that
1293    a background texture only affects readability when the text contrast is low.
1294    Also, as discussed there, subjective assessments of readability often have low correlation
1295    with objective measurements.
1296    
1297  Additionally,  Additionally,
1298  text readability on the generated backgrounds depends  text readability on the generated backgrounds depends
1299  strongly on the text scale; making it easy for the user to zoom  strongly on the text scale; making it easy for the user to zoom

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