Automatic Number Plate Recognition (ANPR)

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