|
|
@@ -204,7 +204,8 @@ In our case the support vector machine uses a radial gauss kernel function. The
|
|
|
\section{Implementation}
|
|
|
|
|
|
In this section we will describe our implementation in more detail, explaining
|
|
|
-the choices we made in the process.
|
|
|
+the choices we made in the process. We spent a lot of attention on structuring
|
|
|
+the code in such a fashion that it can easily be extended.
|
|
|
|
|
|
\subsection{Character retrieval}
|
|
|
|
|
|
@@ -528,6 +529,27 @@ grid-searches, finding more exact values for $c$ and $\gamma$, more tests
|
|
|
for finding $\sigma$ and more experiments on the size and shape of the
|
|
|
neighbourhoods.
|
|
|
|
|
|
+\subsubsection*{Faulty classified characters}
|
|
|
+
|
|
|
+As we do not have a $100\%$ score, it is interesting to see what characters are
|
|
|
+classified wrong. These characters are shown in appendix \ref{faucla}. Most of
|
|
|
+these errors are easily explained. For example, some 0's are classified as
|
|
|
+'D', some 1's are classified as 'T' and some 'F's are classified as 'E'.
|
|
|
+
|
|
|
+Of course, these are not as interesting as some of the weird matches. For
|
|
|
+example, a 'P' is classified as 7. However, if we look more closely, the 'P' is
|
|
|
+standing diagonal, possibly because the datapoints where not very exact in the
|
|
|
+XML file. This creates a large diagonal line in the image, which explains why
|
|
|
+this can be classified as a 7. The same has happened with a 'T', which is also
|
|
|
+marked as 7.
|
|
|
+
|
|
|
+Other strange matches include a 'Z' as a 9, but
|
|
|
+this character has a lot of noise surrounding it, which makes classification
|
|
|
+harder, and a 3 that is classified as 9, where the exact opposite is the case.
|
|
|
+This plate has no noise, due to which the background is a large area of equal
|
|
|
+color. This might cause the classification to focus more on this than on the
|
|
|
+actual character.
|
|
|
+
|
|
|
\subsection{Speed}
|
|
|
|
|
|
Recognizing license plates is something that has to be done fast, since there
|
|
|
@@ -689,12 +711,13 @@ were instantaneous! A crew to remember.
|
|
|
|
|
|
\appendix
|
|
|
|
|
|
-\section{Faulty Classifications}
|
|
|
+\section{Faulty classified characters}
|
|
|
+\label{faucla}
|
|
|
|
|
|
\begin{figure}[H]
|
|
|
\hspace{-2cm}
|
|
|
\includegraphics[scale=0.5]{faulty.png}
|
|
|
- \caption{Faulty classifications of characters}
|
|
|
+ \caption{Faulty classificatied characters}
|
|
|
\end{figure}
|
|
|
|
|
|
\begin{thebibliography}{9}
|