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 |
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objects, indicating that the spatial resolution of the feature |
592 |
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vector is quite low - as a well-known example, conjunction |
593 |
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coding is not preattentive - red squares are hard to find among |
594 |
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green squares and red and green circles. |
595 |
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|
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 |
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|
603 |
\begin{figure} |
\begin{figure} |
604 |
\centering |
\centering |
1277 |
|
|
1278 |
\subsection{Text readability} |
\subsection{Text readability} |
1279 |
|
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JVK: KÄYTÄ viitettä |
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|
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 |
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Experiments in \cite{scharff00discriminability} indicate, that |
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a background texture only affects readability when the text contrast is low. |
|
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Also, subjective assesments of readibilty often have low correlation |
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|
with objective measurements\cite{scharff00discriminability}. |
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XXX |
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|
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 |
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|
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 |