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Taddeüs Kroes
licenseplates
Commits
6dee71df
Commit
6dee71df
authored
Dec 21, 2011
by
Richard Torenvliet
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Merge branch 'master' of github.com:taddeus/licenseplates
Conflicts: docs/verslag.tex
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...
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@@ -125,12 +125,11 @@ straight lines and simple curves, LBP should be suited to identify these.
The LBP algorithm that we implemented is a square variant of LBP, the same
that is introduced by Ojala et al (1994). Wikipedia presents a different
form where the pattern is circular, this form is convenient because with
interpolation you can choose the size of the circle
\textbf
{
and
}
to how many
neighbours the circle has. That means how many times the center pixel
has to be evaluated against a neighbour.
interpolation you can choose the size of the circle
\textbf
{
and
}
how many
neighbours the circle has.
In the literature there are lots of examples where LBP is used for surface
recognition, facial recognition, human face emotion recoqnition (
(Pietik
\"
ainen, Hadid, Zhao
\&
Ahonen (2011)))
recognition, facial recognition, human face emotion recoqnition (
Pietik
\"
ainen, Hadid, Zhao
\&
Ahonen (2011))
\begin{itemize}
\item
Determine the size of the square where the local patterns are being
registered. For explanation purposes let the square be 3 x 3.
\\
...
...
@@ -195,7 +194,7 @@ Important to note is that due to the normalization of characters before
applying LBP. Therefore, no further normalization is needed on the histograms.
Given the LBP of a character, a Support Vector Machine can be used to classify
the character to a character in a learning set.
The SVM uses
the character to a character in a learning set.
\subsection
{
Matching the database
}
...
...
@@ -205,6 +204,8 @@ histograms of an image as a feature vector. The SVM can be trained with a
subsection of the given dataset called the ''Learning set''. Once trained, the
entire classifier can be saved as a Pickle object
\footnote
{
See
\url
{
http://docs.python.org/library/pickle.html
}}
for later usage.
In our case a support vector machine uses a radial gauss kernel. The SVM finds
a seperating hyperplane with minimum margins.
...
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@@ -323,7 +324,6 @@ cells are related to one histogram. All the histograms are concatenated and
feeded to the SVM that will be discussed in the next section, Classification.
\subsection
{
Classification
}
The SVM used in our project is a Gaussian radial based function. Where the kernel is
\section
{
Finding parameters
}
...
...
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