Eurotech SekuPLATE Owner's manual

SekuPLATE

License Plate Recognition System

INSTALLATION MANUAL

Rev 1.0 – 31 January 2012 – Seku-PLATE_InstMan_En_1.0

Trademarks

All trademarks both marked and unmarked appearing in this document are the property of their respective

owners.

Revision history

Revision

Description

Date

1.0

First release

31 January 2012

Table of contents SekuPLATE Installation Manual

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Table of contents

Trademarks .................................................................................................................................................................. 2

Revision history ........................................................................................................................................................... 2

Table of contents .......................................................................................................................................................... 3

Important user information .......................................................................................................................................... 5

Alerts that can be found throughout this manual ......................................................................................................... 5

Safety notices and warnings ........................................................................................................................................ 6

Antistatic precautions ............................................................................................................................................. 6

Connection to power supply or other devices ........................................................................................................ 6

Warranty ...................................................................................................................................................................... 7

CE Marking .................................................................................................................................................................. 7

WEEE .......................................................................................................................................................................... 7

RoHS ........................................................................................................................................................................... 7

Technical assistance ................................................................................................................................................... 7

Shipping ................................................................................................................................................................. 8

Product overview .......................................................................................................................................................... 9

Product block diagram ................................................................................................................................................. 9

Technical Features ...................................................................................................................................................... 9

Specifications .............................................................................................................................................................. 11

Installation and principles of operation ...................................................................................................................... 11

Operation ................................................................................................................................................................... 14

Free-run................................................................................................................................................................ 15

Triggered .............................................................................................................................................................. 15

Image format ........................................................................................................................................................ 15

Image authentication algorithm ............................................................................................................................ 18

JPEG compression .............................................................................................................................................. 21

Mechanical features .................................................................................................................................................. 22

Physical interface....................................................................................................................................................... 22

Power requirements ............................................................................................................................................. 24

Inputs .................................................................................................................................................................... 24

Outputs ................................................................................................................................................................. 24

Configuration of the device ........................................................................................................................................ 25

Initial access to the configuration interface ............................................................................................................... 25

The web interface ...................................................................................................................................................... 25

Settings ................................................................................................................................................................ 26

Wildcards.............................................................................................................................................................. 33

Countries .............................................................................................................................................................. 34

Checklist ............................................................................................................................................................... 34

Events/Actions ..................................................................................................................................................... 35

OCR Results ........................................................................................................................................................ 36

Statistics ............................................................................................................................................................... 38

Live ....................................................................................................................................................................... 39

FTP Server ........................................................................................................................................................... 40

System Time ........................................................................................................................................................ 41

Users .................................................................................................................................................................... 42

Firmware .............................................................................................................................................................. 43

Device .................................................................................................................................................................. 44

Logs ...................................................................................................................................................................... 45

Remote access via FTP ............................................................................................................................................ 45

SekuFINDER ................................................................................................................................................................ 47

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Notes ............................................................................................................................................................................ 49

Important user information SekuPLATE Installation Manual

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Important user information

Please carefully read and understand the instructions contained in this manual before using any product.

Whenever there is any doubt about the operation of the product, please consult this manual or contact technical

support.

Keep this manual safe for future reference.

In order to reduce the risk of personal injury, electric shocks, fire or damage to the equipment, users must

observe the following precautions, as well as exercising good technical judgement, whenever the product

described in this manual has to be installed or used.

Although every effort has been made to ensure the accuracy of this manual, Eurotech SpA does not accept any

liability arising from any errors or omissions, or from the use of the information contained in this manual.

Eurotech reserves the right to modify or correct the contents of this manual at any time and without prior notice.

Alerts that can be found throughout this manual

The following alerts indicate potentially dangerous situations:

Symbol

Meaning

DANGER!

Information highlighting potential electrical shock hazards:

 Personal injury or death could occur.

 Damage to the system, connected peripheral devices, or software could occur.

Appropriate safety precautions should always be used; these should meet the requirements set out for the

environment that the equipment will be deployed in.

WARNING!

Information highlighting potential hazards:

 Personal injury or death could occur.

 Damage to the system, connected peripheral devices, or software could occur.

Appropriate safety precautions should always be used; these should meet the requirements set out for the

environment that the equipment will be deployed in.

NOTE

These will highlight important features or instructions.

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Safety notices and warnings

Users must observe the following safety precautions during all phases of operation, service, and repair of the

device. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates

safety standards of design, manufacture, and intended use of the device.

Eurotech assumes no liability for the customer’s failure to comply with these requirements.

The safety precautions listed below represent warnings of certain dangers of which Eurotech is aware. You, as

the user of the device, should follow these warnings and all other safety precautions necessary for the safe

operation of the device in your operating environment.

Antistatic precautions

Warning!

In order to avoid irreparable damage as a result of ESD (electrostatic discharge), it is advisable to

take all necessary precautions (for example, using an anti-static wrist strap connected to an

earthing point) before handling the device.

Connection to power supply or other devices

Danger:

Failure to observe the following precautions may result in damage, fire or electric shock, with the

possibility of serious injury!

 To avoid accidents, always disconnect the power supply and discharge the circuits before touching the

device.

 Use a power source with voltage and frequency ratings that match those specified on the device’s label. In

case of doubt, contact Eurotech Technical Support (see the inside and outside back cover of this manual for

further details) or your electricity supplier.

 Before making connections to other devices, read the user instructions for those devices.

 Always disconnect the power from the device before making connections or disconnections.

 Do not make connections or disconnections with damp or wet hands.

 Before using the device, make sure that the power and connecting cables are not damaged, knotted or

crushed.

 Avoid running power or connecting cables through areas where there is a danger of their being crushed or

damaged

 Supply power to the device only after checking all the connections, avoiding power overloads

 Do not tamper with the power connections.

NOTE:

If the device must be moved from one place to another with different ambient temperatures, ensure sufficient

time for the temperature of the device to stabilize before repowering.

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Warranty

Please contact your local Eurotech Sales Office for detailed warranty terms and conditions.

Refer to the back covers of this manual for full contact details.

CE Marking

This product is CE marked.

The CE marking on the product indicates that the system has been tested and conforms

to the Electromagnetic Compatibility Directive 2004/108/EC and the Low Voltage

Directive 2006/95/EC.

Eurotech is not responsible for the use of its products with other devices (e.g. chargers,

personal computers, etc.) that do not bear the CE marking or comply with the technical

requirements specified in this manual.

WEEE

The information below is provided in compliance with current legislation on the disposal of waste electrical and

electronic equipment (WEEE).

The symbol shown to the side is found on equipment, on packaging, in instructions or on

guarantee documents, and indicates that the product (including its components,

subassemblies and consumables that form an integral part of the product), is deemed to be

‘waste electrical and electronic equipment or WEEE’. At the end of its useful working life it

must be collected and disposed of separately from other refuse.

 Because of the substances present in the equipment, improper use or disposal of the refuse can cause

damage to human health and to the environment

 With reference to WEEE, it is compulsory not dispose of the equipment with normal urban refuse,

arrangements should be instigated for separate collection and disposal

 Contact your local waste collection body for more detailed recycling information

 In case of illicit disposal, sanctions will be levied on transgressors

RoHS

This equipment, including its components, subassemblies and consumables that form an integral part of the

product, in compliance with current legislation, complies with European Directive 2002/95/EC (known as the

RoHS Directive) on the Restriction of the Use of certain Hazardous Substances (RoHS) in Electrical and

Electronic Equipment (EEE).

Technical assistance

Contact Eurotech’s Technical Support (see the inside and outside back cover of this manual for further details) if

you have any concerns or questions of a technical nature, problems linked to the operation of the device, or to

obtain information about repairs or the procedure for returning devices.

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Shipping

Before shipping the device, for whatever reason, make sure it is properly wrapped in anti-static material and

packaged in a sturdy box using packing materials that will protect it from knocks and vibration.

Warning:

The guarantee on a product returned to Eurotech will automatically become void should the product

arrive bearing damage caused by inadequate packaging!

Product overview SekuPLATE Installation Manual

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Product overview

The SekuPLATE family is made up of high performance systems for the automatic recognition of vehicle number

plates. They have been designed to operate in hostile environments and under poor lighting conditions.

The following systems make the SekuPLATE family:

 SekuPLATE 10-10: for applications where vehicles are travelling at moderate speeds (up to 290Km/h);

 SekuPLATE 10-11: for applications where vehicles are travelling at moderate speeds (up to 290Km/h)

and with context camera;

 SekuPLATE 11-10: for applications where vehicles are travelling at reduced speeds ( up to 70Km/h);

Specificities and differences among these models will be highlighted throughout the text.

Product block diagram

The block diagram below shows the SekuPLATE unit with its principal components and a list of the I/O signals.

Technical Features

Operating System

 Microsoft® Windows XP Embedded Standard

Product overview SekuPLATE Installation Manual

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Processor

 CPU: 1.3 GHz

Memory

 Storage memory

 OS memory

Communications

 2 opto-isolated inputs 5-30 VDC

 2 relay outputs (Contacts: Common/Normally Open/Normally Closed) – Max. 30VDC - 3A

 1 RS-232 serial port

 1 Gigabit Ethernet port 10/100/1000 Base-T

Power requirements

 24-30 VDC input

 Typical consumption: 15 W

Video Camera

 Sensor type: Progressive scan B/W CCD

 Resolution: 1296 x 966 pixels

 Frame rate: 25 FPS

 Standard C-mount lenses

Lighting

 IR lighting - completely invisible both at night and during the day

 Class: 1M CEI EN 69825-1 ed.4

Mechanical

 Dimensions: 203 x 125 x 184 mm (8.0” x 4.9” x 7.2”)

 Weight: 2.5 Kg

Environment

 Protection level: IP66

 Operating temperature: -10°C/+50°C

Mode of operation

 Free-run 25 FPS

 Trigger: reading following an input signal from one of the two digital inputs

Features

 System configuration via web interface

 Ability to transfer data related to the number plate reading using:

o FTP (backup and mirror capability)

o TCP (via ESTP protocol)

o Serial RS-232

Specifications SekuPLATE Installation Manual

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Specifications

Installation and principles of operation

To guarantee the optimal performance of the SekuPLATE number plate recognition system, certain constraints

must be observed during installation of the device. These constraints are necessary to ensure that the geometry

of the image is good enough to be read by the OCR software.

Constraint on the maximum width of the field of view

The first parameter to take into consideration is the maximum width of the field of view: this value is limited by the

resolution of the sensor and the type of number plate to be read. Specifically, the limits of the SekuPLATE

number plate reader are shown in Table 1.

Resolution of the

sensor

Italian rear number plates

and other European

number plates

Italian front number plates

and Italian motorcycle

number plates

1296 x 966 pixels

5.2 metres

3.2 metres

This limit is due to the fact that the individual characters of the number plate, that are assumed to be 4 cm or

more in size (for rear number plates), must be represented in the image by a sufficient number of pixels to enable

the OCR engine to process it correctly. The system could function without this constraint, but the performance

would be unsatisfactory. Clearly the front number plate, which is smaller, introduces more demanding limits on

the maximum size of the field of view.

Constraint on the horizontal and vertical inclination

For the best performance the number plate reading system must be installed in such a way as to keep the

pointing angles within the limits shown in the diagrams.

Figure 1. SekuPLATE pointing angles

If the device is installed with angles greater than those indicated, it could result in a potentially significant

degradation in performance of the number plate reading system.

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Selection of the lens

The choice of lens makes it possible to manage the different configurations effectively in order to obtain the best

system performance.

The parameters that affect the choice of lens, other than those illustrated previously, are the position and the

height of the device in relation to the vehicle in the frame. The field of view, the lens and the distance of the

device from the target are obviously inter-related parameters.

Figure 2 shows an example of how, based on the width of the field of view, the lens and the distance from the

target will vary.

Figure 2. Relationship between the lens, the field of view and the distance from the target (sensor 1/3")

Information is provided below on possible configurations that can be adopted in relation to the different lenses

used with the SekuPLATE system.

12

mm lens

Front number plates

Width of the field of

view (m)

Minimum target

distance (m)

Maximum device

height (minimum

distance) (m)

Maximum target

distance (m)

Maximum device

height (maximum

distance) (m)

2

5

2.3

8.5

3.5

2.5

6.5

3

8.5

3.5

3

7.5

3.2

8.5

3.5

Not possible

-

Not possible

-

4

Not possible

-

Not possible

-

Rear number plates

Width of the field of

view (m)

Minimum target

distance (m)

Maximum device

height (minimum

distance) (m)

Maximum target

distance (m)

Maximum device

height (maximum

distance) (m)

2

5

2.3

12.5

4.5

2.5

6.5

3

12.5

4.5

3

7.5

3.2

12.5

4.5

3.5

9

4

12.5

4.5

4

10

4.5

12.5

4.5

3m

15.6

m

10m

7.5m

12mm

16mm

25mm

Specifications SekuPLATE Installation Manual

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16

mm lens

Front number plates

Width of the field of

view (m)

Minimum target

distance (m)

Maximum device

height (minimum

distance) (m)

Maximum target

distance (m)

Maximum device

height (maximum

distance) (m)

2

7

3.2

10.5

4.5

2.5

8.5

3.8

10.5

4.5

3

10

4.5

10.5

4.5

3.5

Not possible

-

Not possible

-

4

Not possible

-

Not possible

-

Rear number plates

Width of the field of

view (m)

Minimum target

distance (m)

Maximum device

height (minimum

distance) (m)

Maximum target

distance (m)

Maximum device

height (maximum

distance) (m)

2

7

3.2

16

5

2.5

8.5

3.8

16

5

3

10

4.5

16

5

3.5

12

5

16

5

4

13.5

5

16

5

25 mm lens

Front number plates

Width of the field of

view (m)

Minimum target

distance (m)

Maximum device

height (minimum

distance) (m)

Maximum target

distance (m)

Maximum device

height (maximum

distance) (m)

2

11

5

16

5

2.5

13

5

16

5

3

16

5

16

5

3.5

Not possible

-

Not possible

-

4

Not possible

-

Not possible

-

Rear number plates

Width of the field of

view (m)

Minimum target

distance (m)

Maximum device

height (minimum

distance) (m)

Maximum target

distance (m)

Maximum device

height (maximum

distance) (m)

2

11

5

16

5

2.5

13

5

16

5

3

16

5

16

5

3.5

16

5

16

5

4

16

5

16

5

Specifications SekuPLATE Installation Manual

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Operation

SekuPLATE is a number plate reader that can process images in real time, identify the number plate of the

vehicle and process the images in order to provide details of the transit.

The operating principle of SekuPLATE is as follows:

Image Acquisition

SekuPLATE acquires images at a rate of 25 FPS: these images are then processed in real time by the OCR

engine. The parameters governing the acquisition can be configured by the user. The Settings section contains a

detailed description of all the parameters relating to the image acquisition phase.

The acquisition, like the processing steps that follow, depends on the operating mode of the number plate reader:

free-run or triggered. These operating modes will be described in detail in the paragraphs that follow.

OCR Processing

The number plate recognition algorithm analyses the captured images and generates events depending on the

result of the processing. The events generated by the OCR may be of three types:

 OCR READ

 OCR NOT READ

 OCR NO PLATE

In free-run mode only two events are possible: ‘OCR READ’ or ‘OCR NOT READ’. The first event is generated

when the algorithm recognises a number plate and performs a valid read. The second event is generated when

the algorithm recognises a number plate but is unable to perform a valid read. Where no number plate is

detected, the algorithm does not generate an event, but proceeds to process the images supplied by the video

camera.

In triggered mode all three of the events listed above may occur. In this instance the algorithm operates solely

when an input signal is received, defining the start of the OCR processing phase. The first two events are

generated in the same way as those described for the free-run operating mode. The ‘OCR NO PLATE’ event

occurs when the trigger signal initiates a read but the recognition algorithm is unable to identify a number plate in

the input images.

The parameters governing the OCR are configurable and can be modified by the user. The Settings section

contains a detailed description of all the parameters relating to the OCR engine.

Image Processing

In this phase, when the OCR generates an event, the operations configured via the web interface are carried out.

The user can customise the operations to be carried out in connection with an event.

The events that can occur are as follows:

 OCR Read

 OCR Not Read

 OCR No Plate

Image

acquisition

OCR

processing

Image

processing

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 Match List A

 No Match List A

 Match List B

 No Match List B

These events and the way they can be customised are described in the Events/Actions and Checklist sections.

The actions that can be taken when one of the above-listed events is generated are as follows:

 Save image locally (local storage of the image)

 Save image remotely (remote storage of the image via FTP)

 Save raw info (remote storage of data via FTP)

 232 Message (send message via the RS-232 serial port)

 Generate output trigger (generation of a signal on one of the output ports)

 TCP message (generation of a message via ESTP)

The details and options that can be customised for each of the above-listed actions can be found in the Settings

and Events/Actions sections.

Free-run

Free-run mode provides a continuous processing of the images by the OCR: it is the number plate recognition

algorithm that automatically determines if and when transits occur.

The acquisition of the images takes place at a speed that can vary between 10 and 25 frames per second.

Should the number plate recognition algorithm detect a valid transit it generates an ‘OCR READ’ event that leads

to the operations defined by the user being carried out. Should the algorithm identify a transit but be unable to

read the number plate correctly, it generates an ‘OCR NOT READ’ event. As previously explained, these are the

only events possible in this operating mode.

Triggered

The triggered mode operates only after receipt of an input signal. It is possible to select one of the two inputs

provided by SekuPLATE as the source of the trigger signal. On receiving the signal the system starts processing

for a period of time as defined by the ‘Trigger acquisition duration’ parameter (see the Settings section for

details): this parameter specifies the time interval at the end of which SekuPLATE will generate an event

consistent with the result of the processing phase.

In addition to the events already described - ‘OCR READ’ and ‘OCR NOT READ’ - SekuPLATE will also generate

the event ‘OCR NO PLATE’ in triggered mode. This is generated when the OCR engine is unable to detect a

number plate within the specified time interval for the read.

Image format

The images of the transits can be stored both locally and remotely via FTP or ESTP (a proprietary ETH Security

protocol). These images contain important information that allows them to be associated unequivocally with a

device. This essential characteristic is achieved by means of a digital signature mechanism. This mechanism

makes it possible to check, at any time:

 the authenticity of the image

 the integrity of the image

 an unequivocal association of an image to a SekuPLATE device

The details of the algorithm for the digital signature of the image are illustrated in detail under the sub-heading

'Image Authentication Algorithm'.

The images include an information box containing certain items of information on the transit detected by the OCR

engine.

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Figure 3. Example of an image relating to a valid daytime transit

As can be seen from the sample images in Figure 3 and Figure 4, the information contained in the box is as

follows:

 DATE: indicates the date on which the image was captured

 TIME: indicates the time at which the image was captured to a resolution of a millisecond

 PLATE: when an image is generated following an ‘OCR READ’ event this field will contain the number

plate of the vehicle depicted during the transit. When an image relates to an ‘OCR NOT READ’ or ‘OCR

NO PLATE’ event, this field will contain the value ‘ND’.

During night-time, as shown in Figure 4, the context information is lost due to the inadequate lighting.

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Figure 4. Example of an image relating to a valid night-time transit



The information box is normally situated in the top left-hand corner of the image: in the event this positioning

would result in the number plate being covered, it is automatically repositioned in the top right-hand corner.

Figure 5 depicts an instance where the box would have totally or partially covered the number plate of the vehicle

in the image, and so was repositioned in the opposite corner in order to prevent this from happening.

The information concerning the transit, as well as being reported in the information box, is also written into the

header of the image itself, together with additional details that help ensure the authenticity and the integrity of the

information.

In addition to the fields described above, the header of the image contains the following information:

 FIRMWARE_VER: the version of the firmware loaded onto the device

 SN: the Serial Number. This number enables the image to be associated unequivocally with a

SekuPLATE device. Therefore, where necessary, this value can be confidently traced back to the

device that produced the image

 SIGNATURE: the digital signature of the image. This value makes it possible to confirm the integrity and

authenticity of the image, and to guarantee the match between the device that produced the image and

the image itself. The mechanism that generates the signature, and the details relating to it, are

illustrated in the following paragraph.

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Figure 5. Example of the alternative positioning of the information box

The configuration interface allows for flexible management of the generation of images following the various

events linked to a transit. This interface includes a mechanism that makes it possible to satisfy various

requirements, taking account of problems relating to bandwidth, storage and communications protocols: this

enables clients to find solutions that are appropriate to their configurations.

Image authentication algorithm

The authentication algorithm is based on a well-known digital signature mechanism, the Digital Signature

Standard. This mechanism is specified in the document FIPS 186-3, which can be downloaded from the internet

site http://csrc.nist.gov/publications/fips/fips186-3/fips_186-3.pdf.

The digital signature for the image generated by SekuPLATE uses the SHA-256 hash algorithm and the RSA

2048-bit key encryption algorithm. In accordance with the NIST security guidelines

(http://csrc.nist.gov/publications/nistpubs/800-57/sp800-57-Part1-revised2_Mar08-2007.pdf) this encryption

algorithm, together with the hash algorithm, makes it possible to define a signature that will be secure until 2030.

The digital signature mechanism is depicted in Figure 6. In the first phase, the image is modified by the addition

of the information relating to the transit as described in the preceding paragraph (DATE, TIME, etc.).

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Figure 6. Functional diagram of the digital signature algorithm

The header field that is to contain the digital signature is filled with zeros, after which the digest is generated. The

digest is the result of applying the hash algorithm to the image: SekuPLATE uses the SHA-256 algorithm. The

result of the hash algorithm is then encrypted using the private RSA key, so generating the digital signature. The

digital signature generated using a 2048-bit key is 256 bytes long. In the last phase the signature is entered into

the header field set aside for it.

The process for verifying the signature is shown in Figure 7.

Figure 7. Functional diagram of the verification of the digital signature

The digest, inserted into the image, is extracted and deciphered using the public key, which by definition, is

available to any user. The fact that the public key is known to others does not in any way jeopardise the security

of the corresponding private key, because of the way in which the encryption algorithm has been designed.

Once in possession of the digest of the original image, it is possible to carry out a similar hash operation on the

image received: by comparing these two values it is possible to see whether the data has been modified or if it

has remained unchanged.

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The digital signature is verifiable, whenever the need may arise, by means of the ‘SignVerifier’ program and the

public key associated with the private key used for the signature. Figure 8 shows an example of how the

SignVerifier program is used: simply select the image to be verified together with the public key and then click on

the ‘Check signature’ box.

Figure 8. ETH SignVerifier

Once processing is complete, the hash identified within the image and the one calculated by the program are

displayed: if these two values match, the image contains valid information, otherwise it is not considered reliable.

Should the image have been modified, even by just a few bits, the two hash values will be completely different,

highlighting the fact that the information is not authentic. Figure 9 shows an example in which the image has been

modified: as can be seen, the hash value obtained from the image is completely different to the one contained in

the digital signature.

This mechanism makes it possible to:

 protect the image from any attempt at falsification or modification. The change of just one bit in the

document would mean that the hash from the original image and the one from the modified image no

longer match.

 guarantee the authenticity of the information. The signature guarantees that the data relating to the

transit is linked unequivocally to the device that generated it. This mechanism is guaranteed by the

inclusion of the serial number, a number that identifies a specific hardware device. That number cannot

be modified in any way and is therefore an essential piece of information that links the transit to a

specific SekuPLATE device.

 guarantee the authenticity of the SekuPLATE device: only someone in possession of the correct private

key can generate a valid signature. This makes it possible to confirm with certainty that the signature

was created by a SekuPLATE device.

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Eurotech SekuPLATE Owner's manual

Eurotech SekuPLATE Owner's manual

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