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An Introduction to Automatic Number Plate Recognition (ANPR)
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AUTOMATIC NUMBER PLATE RECOGNITION
ByVidyut Singhania
Ahmed Zaid Faizee
INTROO A vehicle registration plate is a metal
or plastic plate attached to a motor vehicle or a trailer for Official Identification purposes.
O The registration number is a numeric or an alphanumeric code that uniquely identifies the vehicle within the issuing region’s database.
SO WHAT ARE WE TALKING ABOUT ??
O Automatic Number Plate Recognition (ANPR) is a mass surveillance method that uses Optical Character Recognition on images to read the license plates on vehicles.
O ANPR Cameras are specialized types of CCTV camera that has software built into it to help ID and capture license plates on still and moving vehicles.
WHAT’S THE BASIS / PREMISE ?
O ANPR can be used to store the images captured by the cameras as well as the text from the license plate, with some configurable to store a photograph of the driver.
O Systems commonly use InfraRed (IR) lighting to allow the camera to take the picture at any time of the day. ANPR technology tends to be region-specific, owing to plate variation from place to place.
SO WHERE IS IT USED ?
O ANPR systems are here to stay – from Parking and Motorway Tolling to Border Control and Journey Time Enforcement
O The most predominantly prevalent usage of ANPR, today, is in Electronic Toll Collection systems (ETC) / Intelligent Traffic Management Systems.
Purpose
• The Automatic Number Plate Recognition is a system designed to help in recognition of number plates of vehicles.
Basis
• This system is based on the image processing system.
Use
• This system helps in the functions like detection of the number plates of the vehicles, processing them and using processed data for further processing like storing, allowing vehicles to pass or to reject vehicle.
IMPLEMENTATION Vehicle Web Camera
Capturing
Conditioning
Detection
Segmentation
Identification
Save Parallel port Gate control
Display
Template
MicroController
PREREQUISITESSoftwar
eHardwa
re
IR Sensors
Webcam
PC
Storage
MATLAB
Webcam
OCR
Basic Functions in ANPR
Capture an optimized image of the car(s).
Process the optimized image to segregate &
read the license plate(s).
Store the recognized image in the database.
Embedded SystemsO The entire process of ANPR is hinged
on the very basis of a singular Embedded System –the CAMERA.
O The Camera forms the crux of the entire system – for without the presence of the Camera and it’s specialized software, there would be NO recognition of those License Plates.
ANPR Camera Pt.IO The Camera herein has to do a
majorly different task from what the rest of its brethren have been designed to do.
O There are numerous tasks it must carry out – and all within the timespan of less than a heartbeat!
Vehicle no
VehicleCamera
Computer Door control
Cam nosize
Brand name
Ip add capacityCom name
memory Pross speed
storage
Extract info
Serves information
monitor Serves info
Resolution
Camera Pt.IIITo put it in the simplest of words –
The Camera must take the most OPTIMIZED picture of the License rather than just a normal picture.
The camera, triggered by the IR sensor, captures the image of the approaching vehicle and after further processing of the vehicle using image processing information of the vehicle such as number plate is stored in the computer using Automated Number Plate Recognition System.
Camera Pt.VO We generally use two cameras for
traffic surveillance :i. The monochrome camera produces
high-contrast license plate images characterized by great clarity.
ii. Simultaneously, a second camera captures color overview images of the vehicles for additional video evidence.
How License Plate Capture initiates LPR
Video Motion Detection
Detects the vehicle passing through the illuminated region
This triggers the camera to take a picture
ANPR SoftwareO There are numerous software
features :i. High Recognition Rateii. High Recognition Speed (<0.2s)iii. Supporting Multiple Lane Motion
Detectioniv. Standardized Resolution of 720*480
(NTSC) to provide higher accuracyv. Vehicle counter feature
Camera Specifications (General)
O Mounted approx. 36 inches from the height of the street / lane.
O As straight on without being in the line of travel.O Recording at a resolution of 30fps.O Settings in the On-Screen Display (OSD) to eliminate
interference from light sources – like headlights or taillights.
O Varifocal lens for narrowing the field of view to just over a single lane’s width.
O Availability of RS 485 connection that goes back to the DVR and controls the OSD remotely.
O Two most common types of cameras used are :O Bullet Camera O Box Camera
A Comparison of Numerous ANPR Specifications
Models GV-LPR-1
GV-LPR-2
GV-LPR-4
GV-LPR-6
GV-LPR-8
# of Lanes
1 2 4 6 8
Total FPS 30 60 120 240 240
FPS / Cam
30
CPU Core2Duo
E6300
Core2Quad
Core2 Quad
Intel i7920
Intel i9270
OS Support
ed
Windows 2000 / Windows XP / Windows Server 2003 / Windows Vista
HDD 250 GB 250 GB 250 GB 250 GB 250 GB
RAM DDR2 1 GB
DDR2 2 GB
DDR 2 GB
DDR3 2 GB
DDR3 2 GB
Source : CCTV Camera Pros
Camera RequirementsAttribute Value
Illumination 0.05LUX or lower
Minimum Resolution 480 Horizontal Lines
Auto Electric Shutter 1 / 60 ~ 1 / 1,00,000sec
Auto White Balance Compensation
Required
Backlight Compensation Required
Source : CCTV Camera Pros
bIblIographyO http://
en.wikipedia.org/wiki/File:LPR_Process.JPG
O http://www.kintronics.com/lpr/lpr-cameras.html
O http://www.axxonsoft.com/integrated_security_solutions/lpr/license_plate_recognition.php
THANK YOU