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We were able to successfully locate the license plate in about 70% of our sample pictures, and of the characters we extracted, we were able to recognize them with about 72.7% accuracy (619 sets of training data).

Future improvements

Compression and cropping

Since we were targeting Texas plates, which only have red, blue, and white colors, we were able to black out many parts of the images by wiping out all green regions. In the future, however, we would like to be able to recognize plates not from Texas that might have green components. Therefore, we should find a criteria for finding the plates other than color.

Letter recognition

Acquiring state pattern and convention attributes

In many license plates, it is difficult to tell the difference between a zero and an O, even for a human. Therefore, for the purposes of this project, zeros and Os were considered the same. However, in many states, it is actually possible to tell the difference because the license plate has a set pattern (e.g., 2 letters, 2 numbers, 2 letters). In the future, we could identify what state the plate comes from and then make use of this knowledge to get more accuracy in letter recognition.

Multi-class support vector machine

In addition, one of the characteristics of SVM is that is solves a two-class problem. In order to get around this, for our project, we used a one-against-the-rest approach. This meant that we basically used the SVM machine to answer the question, "Is this a __?" 35 (A-Z, 1-9) times for each unknown letter/digit. In the future, we will want to look at more efficient and accurate methods. One of the possible improvement can be found in the work by T.-K. Huang, R. C. Weng, and C.-J. Lin. Generalized Bradley-Terry Models and Multi-class Probability Estimates. Journal of Machine Learning Research

Automated training set generation and extraction efficiency

Finally, currently, any digit that we feed into the SVM will register as something; we have no way of telling whether the image is in fact a letter/digit. In the future, we would like to train the machine to be able to tell characters from non-characters. This will allow less rigorous (and time-consuming) computation in the image-processing section and give our algorithm greater flexibility.


Chih-Chung Chang and Chih-Jen Lin, LIBSVM : a library for support vector machines, 2001. Software available at (External Link)

Special thanks

    Thanks to:

  • Dr. Aswin Sankaranarayanan, our mentor
  • Dr. Richard Baraniuk, the ELEC 301 instructor
  • Dr. Fatih Porikli (MERL), for providing us with a license plate dataset
  • Drew Bryant and Brian Bue for technical advising

Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Elec 301 group project- license plate extraction (lipe). OpenStax CNX. Dec 16, 2009 Download for free at http://cnx.org/content/col11145/1.2
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