automatic number plate recognition

AUTOMATIC NUMBER PLATE RECOGNITION

Key concepts
 Introduction
 Technology
 Elements
 Working
 Output
 Advantages
 Disadvantages
 Applications
 Conclusion

Introduction
 A vehicle registration plate is a metal or a plastic plate attached
to a motor vehicle for official identification purposes.
 The license plates are placed on the front and back of the
vehicle.

Automatic Number Plate Recognition
(ANPR)
 ANPR is an image –processing technology
which is used to identify vehicles by their
number plates using Optical Character
Recognition.
 This technology is used in various security and
traffic applications such as access-control
system.

Various names of this technology are:
 License Plate Recognition(LPR)
 Car Registration System(CRS)
 Intelligent Transport System(ITS)

Seven Elements In ANPR
1. Camera
2. Illumination
3. Frame grabber
4. Computer
5. Software
6. Hardware
7. Database

• Camera - that take the images of the car (front or rear
side).
• Illumination - a controlled light that can bright up the
plate, and allow day and night operation. In most cases the
illumination is Infra-Red (IR) which is invisible to the
driver.
• Frame grabber - an interface board between the camera
and the PC, allows the software to read the image
information.

• Computer - normally a PC running Windows or Linux. It runs
the LPR application which controls the system, reads the
images, analyzes and identifies the plate, and interfaces with
other applications and systems.
• Software - the application and the recognition package.
Usually the recognition package is supplied as a DLL.
• Hardware - various input/output boards used to interface the
external world (such as control boards and networking
boards).
• Database - the events are recorded on a local database or
transmitted over the network. The data includes the

WORKING
The ANPR process is divided into three steps:
 Detection of vehicle.
 Capture of images.
 Process of recognition.

Detection Of Vehicles
 The vehicle approaches the secured area and
the process starts when the vehicle steps over a
magnetic loop detector.
 The loop detector senses the car and it’s
presence is signaled to the ANPR unit.

Capture of Images
 The ANPR unit activates the illumination and takes pictures of
the front and rear plates using ANPR camera.
 The images of the vehicle is read by the ANPR unit’s image
processing hardware or the frame grabber.

Process of Recognition
 The ANPR unit analyzes the image with different image
processing software.
 The ANPR unit checks if the vehicle appears on a predefined
list of authorized cars and if found it signals to open the gate
by activating it’s relay.

Process of Recognition(contd…)
 The authorized vehicle enters the secured area
and after passing the gate it’s detector closes
the gate.
 The system waits for the next vehicle to
approach the secured area.

ADVANTAGES
 improving road safety.
 reduces crime.
 gives officers better information to work with.
 deterring terrorism.
 giving a greater police presence.
 increasing the percentage of stop/searches that lead to an
arrest.
 pre-paid parking members can be easily differentiated from
non-members.

Disadvantages
 Firstly, the images of the number plate or of any object
which is taken by using the optical character reader
technology may get blurred mainly due to the reason of
motion blurring for which the picture seems to be hazy
when uploaded in the database.
 Secondly, the technology often uses low-resolution images
for which the images are not actually visible properly in
every case.

APPLICATIONS
 Parking
 Access-control
 Tolling
 Border control
 Stolen cars
 Traffic control

Parking
 The plate number is used to automatically enter pre-paid members and
calculate parking fee for non-members (by comparing the exit and entry
times).

Access-Control
A gate automatically opens for authorized members in a
secured area, thus replacing or assisting the security
guard. The events are logged on a database and could be
used to search the history of events.

Tolling
The car number is used to calculate the travel fee in a toll-
road, or used to double-check the ticket.

Border Control
 This installation covers the borders of the
entire Country.
 Each vehicle is registered into a central
database and linked to additional information
such as the passport data. This is used to track
all border crossings.

CONCLUSION
 There is an immediate need of such kind of Automatic Number
Plate Recognition system in India as there are problems of
traffic, stealing cars etc.
 Government should take some interest in developing this
system as this system is very economical and eco-friendly, if
applied effectively .
 This change will help in the progress of the nation.

automatic number plate recognition

automatic number plate recognition

More Related Content

What's hot (20)

Similar to automatic number plate recognition (20)

Recently uploaded (20)

automatic number plate recognition