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Taddeüs Kroes
licenseplates
Commits
05568537
Commit
05568537
authored
Dec 22, 2011
by
Jayke Meijer
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Added subsections to discussion.
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05568537
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@@ -566,6 +566,8 @@ is not advisable to use.
There are a few points open for improvement. These are the following.
\subsection
{
Other Local Binary Patterns
}
We had some good results but of course there are more things to explore.
For instance we did a research on three different patterns. There are more
patterns to try. For instance we only tried (8,3)-, (8,5)- and
...
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@@ -574,10 +576,11 @@ best result, for a wider range of neighbourhoods. We haven proven that the size
and number of points do influence the performance of the classifier, so further
research would be in place.
One important feature of our framework is that the LBP class can be changed by
an other technique. This may be a different algorithm than LBP. Also the
classifier can be changed in an other classifier. By applying these kind of
changes we can find the best way to recognize licence plates.
The expectation is that using a larger diameter pattern, but with the same
amount of points is worth trying. The theory behind that is that when using a
gaussian blur to reduce noise, the edges are blurred as well. By
\subsection
{
Context Information
}
We don't do assumption when a letter is recognized. For instance Dutch licence
plates exist of three blocks, two digits or two characters. Or for the new
...
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@@ -587,6 +590,8 @@ case when one digit is most likely to follow by a second digit and not a
character. Maybe these assumption can help in future research to achieve a
higher accuracy rate.
\subsection
{
Speed up
}
A possibility to improve the performance speedwise would be to separate the
creation of the Gaussian kernel and the convolution. This way, the kernel can
be cached, which is a big improvement. At this moment, we calculate this kernel
...
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@@ -595,10 +600,11 @@ standard Python function, but we realised too late that there is performance
loss due to this.
Another performance loss was introduced by checking for each pixel if it is
in the image. This induces a lot of function calls and four conditional checks
per pixel. A faster method would be to first set a border of black pixels
around the image, so the inImage function is now done implicitly because it
simply finds a black pixel if it falls outside the original image borders.
in the image. This induces one function call and four conditional checks
per pixel, which costs performance. A faster method would be to first set a
border of black pixels around the image, so the inImage function is now done
implicitly because it simply finds a black pixel if it falls outside the
original image borders.
\section
{
Conclusion
}
...
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