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Taddeüs Kroes
licenseplates
Commits
65070819
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65070819
authored
Nov 18, 2011
by
Taddeüs Kroes
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Updated LBP section in plan.tex.
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65070819
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@@ -99,33 +99,30 @@ at either the left of right side of the image.
\subsection
{
Local binary patterns
}
Once we have separate digits and characters, we inten
d
to use Local Binary
Once we have separate digits and characters, we inten
t
to use Local Binary
Patterns to determine what character or digit we are dealing with. Local Binary
Patters are a way to classify a texture, because it can create a histogram
which describes the distribution of line directions in the image. Since letters
on a license plate are mainly build up of straight lines and simple curves, it
should theoretically be possible to identify these using Local Binary Patterns.
Patters are a way to classify a texture based on the distribution of edge
directions in the image. Since letters on a license plate consist mainly of
straight lines and simple curves, LBP should be suited to identify these.
T
his will actually be the first thing to implement, since it is not known if it
will give the desired results. Our first goal is therefore a proof of concept
that using LBP's is a good way to determine which character we are dealing
with
.
T
o our knowledge, LBP has yet not been used in this manner before. Therefore,
it will be the first thing to implement, to see if it lives up to the
expectations. When the proof of concept is there, it can be used in the final
program
.
Important to note is that by now, we have transformed this letter to a standard
size, which eliminates the need to normalize the histograms generated by the
algorithm.
Important to note is that due to the normalization of characters before
applying LBP. Therefore, no further normalization is needed on the histograms.
Once we have a Local Binary Pattern of the character, we use a Support Vector
Machine to determine what letter we are dealing with. For this, the feature
vector of the image will be a concatenation of the histograms of the cells in
the image.
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
\subsection
{
Matching the database
}
In order to recognize what character we are dealing with, we use a Support
Vector Machine. 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
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 collection of
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.
\end{document}
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