Hanwha Techwin HT230C LPN LPR/ANPR Cameras User Guide

Hanwha Techwin HT230C LPN LPR/ANPR Cameras

LPR/ANPR Cameras – Product Information and Usage Instructions

Product Information

The LPR (License Plate Recognition)/ ANPR (Automatic Number Plate Recognition) Cameras are designed to capture clear images of license plates and read them accurately. These cameras come in different models including PNO-A9081RLP, PNV-A9081RLP, and PNB-A9001LP. They are suitable for a range of applications including community traffic observation, parking, and security. The cameras can recognize over 70 makes of vehicles and over 600 models, and can detect up to 10 different colors.

Specifications

• Lane Coverage: Up to 2 lanes in FullHD mode, up to 3 lanes in 4K mode
• Solution Speed: Moderate speed for PNV-A9081RLP, low speed for PNO-A9081RLP
• Speed Limit: Up to 70km/h for PNV-A9081RLP, up to 40km/h for PNO-A9081RLP
• Min. Forward Distance: 10-12m depending on the model
• Max. Forward Distance: Up to 20m/65.6ft depending on the model
• Max. Horizontal Angle: 30 degrees
• Max. Vertical Angle: Up to 70 degrees depending on the model
• Horizontal Offset: Up to 5m/18ft
• Camera Height: Up to 8m/26.2ft

Product Usage Instructions

Pre-Installation:

Before installing the camera, choose a suitable location that is within the recommended installation constraints. The camera should be installed at a minimum distance from the road, and the maximum forward distance should not exceed 20m/65.6ft. The camera should also be positioned at a height of up to 8m/26.2ft and at an angle of 30 degrees.

Installing and Positioning Camera

The camera should be installed according to the instructions provided in the installation guide for your specific model. Adjust the camera for plate rotation angle to ensure clear and accurate images of license plates are captured. The camera can cover up to 2 lanes in FullHD mode and up to 3 lanes in 4K mode. Setting the recognition zone in the lower half of the camera view is recommended and can improve the camera’s performance.

Configuring Your Camera:

Configure your camera’s initial settings such as field of view and simple focus on plate read area. Use pixel width measurement to ensure license plates fit the criteria for best performance. Ensure proper installation by observing any examples of improper installation provided in the manual.

PRE-INSTALLATION

Choosing a Location
The LPR (License Plate Recognition)/ ANPR (Automatic Number Plate Recognition) Technology running on this camera will provide you with the best results when following the recommended installation constraints below.

Recommended
30 degrees Maximum Vertical Angle Maximum Forward Distance depends on lens zoom, however should not exceed 20 m / 65.6 ft considering effective IR range (for PNO and PNV models).
Please consider using external IR for ranges above 20 m / 65.6 ft.

FORWARD DISTANCE TABLES
The orange dots on the tables below are recommended installation measurements.

[PNO/PNV-A9081RLP]

• Day and night conditions with built in IR
• PNB-A9001LP parameters depends on lens & external IR.

Recommended
30 degrees Maximum Horizontal Angle

Camera in 4K mode can cover up to 3 road lanes.
The FullHD mode can cover up to 2 lanes.
Normally, setting recognition zone (see orange frame below) in lower half of camera view is sufficient and favours app performance.
Best results are achieved when single row number plate width has fit the criteria. Greater width may affect performance.

All the license Plate that are meeting the pixel criteria as below will be recognized in the selected area.

• 130-300 pixels for regular EU plates
• 80-300 pixels for US plates without stacked symbols (small ones)
• 160-300 pixels for US plates with stacked symbols

INSTALLING AND POSITIONING CAMERA

Camera Installation

NOTE: Refer to PNO-A9081RLP, PNV-A9081RLP or PNB-A9001LP installation guide and follow the installation instructions.

Adjust for Plate “Rotation” Angle
For best results, check the angle of your plate compared to the horizontal angle and rotate the camera to less than 5° as shown below (Recommended Angle(s).

LPR(ANPR)/ MMCR Specification

LPR(ANPR) CAMERAS                 PNV-A9081RLP            PNO-A9081RLP PNB-A9001LP

Solution| Community Traffic Observation / Parking Application| City Traffic Observation| Highways
---|---|---|---
Speed Description| Moderate Speed| Low speed| Regular Speed| High Speed
Lane Coverage| Up to 2 lanes| Up to 2 lanes| Up to 2 lanes| Up to 2 lanes
Speed limit| Up to 70kmh (45mph)| Up to 40kmh (25mph)| Up to 100kmh (65mph)| Up to 140kmh (90mph)
Min. Forward Distance| 12m (38ft)| 10m (33ft)| 16m (52ft)| 27m (90ft)
Max. Forward Distance| 17m (55ft)| 16m (52ft)| 46m (150ft)| 46m (150ft)
Max. Horizontal Angle| 25°| 30°| 25°| 15°
Max. Vertical Angle| 25°| 30°| 25°| 15°
Horizontal Offset| Up to 5m (18ft)| Up to 7m (24ft)| Up to 7m (24ft)| Up to 4m (12ft)
Camera Height| Up to 5m (18ft)| Up to 7m (24ft)| Up to 7m (24ft)| Up to 7m (24ft)
Vehicle Recognition| Make : 70+ Makes Model : 600+ models Color : 10 colors| Make : 70+ Makes Model : 600+ models Color : 10 colors| Make : 70+ Makes Model : 600+ models Color : 10 colors| Make : 70+ Makes Model : 600+ models Color : 10 colors

CONFIGURING YOUR CAMERA

NOTE: There is no default user name and password to access the camera setting,

1. Please make your own user name and password at the first instance when you access the camera settings.
2. Make sure to set correct date and time for the camera before going in to any additional settings.

Field of View
The below steps you will perform in the Wisenet camera configuration webpage

1. Configure camera so left and right are correct, not mirrored.
2. Set camera zoom to capture license plate
3. Adjust camera view angle so plate passes through the middle of the image.

Configure Initial Camera Settings
For proper operations, please, check and set properly:

• Camera Date Time (+page 9)
• IP settings (+page 10)
• SD card storage (+page 13)
• Camera exposure and focus (+pages 14~15)
  SSDR, WDR, DIS, Defog, AGC and anti-flickering features are good for human eye but affect computer vision performance and therefore setting these to the least possible effect or turning off strongly advised.

[Date and Time]

• Choose A Timezone and set Use daylight saving time as appropriate.
• Set B date and time or opt to synchronize with your PC or NTP server.
  NOTE: Wisenet Road AI app relies on these settings and if these are not set properly you may not see events in Wisenet Road AI app and events delivered to the outer systems may not contain proper timestamps.

[IP, DNS, Ports]

Proper IP, DNS and ports setting are important for:

• NVR and other integrations
• outside LAN access if required
  NOTE: Reboot the camera whenever IP address gets changed. IP & Port

[Go to App]
Please go to App in camera open platform section.

To run the Wisenet RoadAI app, select the Open platform menu and click the A Go App button in the Application name field.

Go to Wisenet Road AI application tab and select “Settings” from the pull down menu.

• Select the A correct Region from the selection. Default settings will be “Europe”. If you are in any other regions other than the default (Europe) region, pull down the option and select the correct region/country that matches your usage.
• Click B to save the settings.
  In the same “Settings” section, you can also choose to have the C Recommend setting applied.
  NOTE: You would need to go to the web menu of the camera;Open Platform Area to D  Stop and restart the application to take the Regional setting changes to be effective.

[microSD card]
Your camera is supplied with micro SD card.

• SD-card is managed by the Wisenet RoadAI application and no user interaction needed.
• Please check the B SD-Card status in the A ABOUT section of the Wisenet RoadAI app.
• Change the micro SD card if you see Error status

[Exposure adjustments]
Use the recommended settings from the Wisenet Road AI application in most cases. But if you need to manually adjust here are the most common settings that affect the LPR performance.

• A Sensor: 25-30 fps

• B SSDR: Off

• C White balance: ATW

• D Back light: Off
  (try other backlight options only if camera gets blind-ed by headlights in the night)

• E Exposure:

  • minimum shutter speed : 1/300
  • maximum shutter speed : 1/700
  • preferred shutter speed : 1/500
  • Anti flicker : Off
  • SSNR : Default
  • AGC : Low

• F Day/Night:
  Mode: Auto

• G IR: manual

• H Other settings: default

[Exposure adjustments-Automatic Gain Control]

Automatic Gain Control can improve overall scene visibility notably. However, even at low setting AGC produces noise that can ruin license plate images, also lighter areas tend to bleach out. See illustrations to the left.

Start with turning AGC off. See the illustration to the left. Set AGC to low to improve plates visibility unless only other methods are helpful.
Adjust zoom so that real plate pixel width is at least 130px. Consider adjusting recognition zone so it is closer to the centre of the frame to avoid IR vignette effect.

NOTE: Do not use WDR as it decrease the shutter speed and may blur the vehicles.

Simple Focus on Plate Read Area

A unique feature of this camera allows you to select the plate area and hit a button to perform a “Simple Focus” on this plate area.

1. From the Video & Audio menu, select Focus setup.
2. Click and drag to draw an area of focus where the license plate is displayed.
3. Click the Simple Focus button to initiate a focus operation on the user-specified area.

NOTE:
The focus setting of PNB-A9001LP is related to the
lens type, and manual focus is activated when using a manual varifocal lens.
The area indicated is not stored. If you need to perform a new Simple Focus, please draw a new area on-screen.

Set the focus to have plates in the proper pixel size.

• 130-300 pixels for regular EU plates
• 80-300 pixels for US plates without stacked symbols (small ones)
• 160-300 pixels for US plates with stacked symbols

To measure pixel width of license/number plate

1. Spread or move license/number plate (cars) across the scene (see illustration on the left below) and take snapshots using web viewer capturing feature (Live ; Capture);
2. 
3. Use Plate Grid tool in the Settings tab of WisenetRoadAI and Freeze Frame feature to check whether plate fits the allowed range.
4. You can add an image from the Wisenet Road AI ; Settings ; Freeze frame to show the actual settings.

Observing PROPER Installation

SCENE REQUIREMENTS:

Fig. 1
Daytime

• good proportion to the frame width
• well lit
• sufficient contrast
• acceptable tilt angle

Fig. 2
Night time

• good proportion to the frame width
•  perfect IR power
• sufficient contrast
• critical yet acceptable tilt angle

POSSIBLE IR RESTRICTIONS:

• The license/number plate is quite close to the frame boundary.
  You may notice a vignette effect.

• The license/number plate is closer to the centre of the frame.
  The plate is lit much better.

Pay special attention to IR vignette effect (see illustration on the left) when setting up recognition zone. The closer to the center the more even lighting is.
Also in this particular case real pixel width of the license/number plate is critically small.
The Automatic Gain Control effect will be illustrated in camera exposure settings section.

Examples of IMPROPER Installation

Focus and Shutter faults

Exposure faults

For more information visit us at
Hanwha-Security.com

Head Office
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Gyeonggi-do, 463-400 Rep. of KOREA
Tel : +82.70.7147.8753
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http://hanwha-security.com

2021 Hanwha Techwin Co., Ltd. All rights reserved.
DESIGN AND SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
Under no circumstances, this document shall be reproduced, distributed or changed, partially or wholly, without formal authorization of Hanwha Techwin Co.,Ltd.

• Wisenet is the proprietary brand of Hanwha Techwin, formerly known as Samsung Techwin

References

• Hanwha Vision - Global Vision Solution Provider

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