License plate recognition technology embedded in
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VaxALPR On Camera User Manual 1.0 License plate recognition technology embedded in AXIS camera User Manual Version 1.0 VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 1 VaxALPR On Camera User Manual 1.0 Table of Contents 1. About VaxALPR On Camera................................................................................................... 3 2. Product installation ............................................................................................................... 3 3. License ................................................................................................................................... 5 4. Setup quick guide .................................................................................................................. 8 5. Settings .................................................................................................................................. 9 5.1 Main Page .................................................................................................................... 10 5.1.1 Country Options .................................................................................................. 11 5.1.2 Environment Options .......................................................................................... 12 5.1.3 OCR Options ........................................................................................................ 13 5.1.4 Triggered Options ................................................................................................ 13 5.1.5 Reporting Options ............................................................................................... 13 5.2 Region of interest configuration (ROI) ........................................................................ 15 6. VaxALPR On Camera events definition ............................................................................... 16 7. VaxALPR On Camera Viewer ............................................................................................... 18 8. Tips and basic troubleshooting guide ................................................................................. 18 ANNEX I ....................................................................................................................................... 20 ANNEX II ...................................................................................................................................... 21 ANNEX III ..................................................................................................................................... 22 VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 2 VaxALPR On Camera User Manual 1.0 1. About VaxALPR On Camera VaxALPR On Camera is a real-time solution for automatic license plate recognition (ALPR) with multi-country support. The product can be installed in all the AXIS cameras with ARTPEC-4 or ARTPEC-5 chips. The analytics run entirely within the camera, thus no PC is required even for the setup. VaxALPR On Camera is available for parking, low speed free-flow or high speed triggered environments. Results are published through the network under VAPIX/ONVIF protocols, HTTP POST or open proprietary format described in the annex I. 2. Product installation 1. Connect with the camera and select “Applications” at the menu on the left. Axis Main Configuration page Important: VaxALPR On Camera requires a license file. Trial licenses are available, please contact with Vaxtor Systems to request one or check section 3. Web: http://www.vaxtor.com VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 3 VaxALPR On Camera User Manual 1.0 2. Deploy VaxALPR On Camera application. Deploy menu Press the button “Select file” and select the package file provided by Vaxtor Systems (VaxALPR_On_Camera_1_0.eap) Press “Upload package” to deploy the application. The next image shows the application correctly deployed. VaxALPR On Camera deployed VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 4 VaxALPR On Camera User Manual 1.0 3. License VaxALPR On Camera requires a license file to run correctly. To acquire a valid license you can contact Vaxtor Systems or download a trial license valid for 30 days from Axis website (a valid Axis account will be needed). To download a valid license: 1. Select “Application->VaxALPR On Camera->License” on the left menu. Take note of the device serial number that appear on the “Manual Installation” bullet and click on the www.axis.com link. 2. A new browser window will open with the axis website. Login with your axis account or create a new account. Once logged you will be redirected to the “License key registration” webpage. 3. 4. 5. 6. Insert your camera serial number. Select “I do not have a license code”. Select the application VaxALPR On Camera. Press “Generate”. A valid license file will be downloaded. Once you have a valid license file: 1. Select “Application->VaxALPR On Camera->License” on the left menu. Press the button “Select file” and select the license file provided by Vaxtor Systems. VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 5 VaxALPR On Camera User Manual 1.0 2. Press the button “Install”. License options The next image shows the license installed. License installed VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 6 VaxALPR On Camera User Manual 1.0 To ensure that the installation has been done correctly, select the option “Applications -> Overview” on the left menu. The license column will have the value “Valid”. Press “Start” button to run the application. The Status column will have the value “Running”. License validation view VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 7 VaxALPR On Camera User Manual 1.0 4. Setup quick guide By default, VaxALPR On Camera default parameters are set to recognize license plates in most scenarios. To start the application follow the next steps: 1. 2. 3. 4. 5. 6. Install the application. Upload a correct license file. Ensure that the application is running. Select the main country (check section 5.1.1). Optional: Create a Region of Interest delimiting the detection area (check section 5.2). Configure the reporting options and the camera ID (check section 5.1.4). Important: The “Reset” button at the Main Page will reset to default all the parameters. VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 8 VaxALPR On Camera User Manual 1.0 5. Settings Please, read carefully this section to setup correctly VaxALPR On Camera application to your environment conditions. VaxALPR On Camera settings are located at the Applications->VaxALPR On Camera->Settings area on the left menu. VaxALPR On camera Main page: Will open a new window with the available settings. Region of Interest configuration: Will open a new tab with the Region of Interest creation interface. VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 9 VaxALPR On Camera User Manual 1.0 5.1 Main Page Main Page Note: The “helps” button at the Main Page will show the parameters information. VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 10 VaxALPR On Camera User Manual 1.0 5.1.1 Country Options Countries Including at least 1 reference country is mandatory. The OCR is country independent, however setting at least one reference increases performance which is a key factor to consider inside the camera environment. The country reference does not necessarily means that plates from other countries are not read (see grammar strict parameter) Countries (1-5): In order to add a new country to the list, click and select from the menu and press the “+” button. The country will be added to the list below. It is possible to add up to 5 countries. To remove a country from the list, press the “x” button. Important: Sort the countries list appearance from more to less probability of occurrence. For instance, if the ANPR is set in UK, set UK as first reference country. To switch the order, drag and drop the selected country to right position. Background mode Establish a difference between plate font and background color “Dark foreground, light background”: Select this option when the plate background color is lighter than the characters (for instance, black fonts on white background) “Light foreground, dark background”: Select this option when the plate background color is darker than the characters (for instance, white fonts on black background) “Both”: Select this option when both types of plates may appear. Important: Be accurate with this option. Do not select “both” unless it really make sense in your scenario since the OCR performance is strongly affect by this setting Grammar strict Enable this option to bound results to the list of selected countries according to its plate grammar. Only the plates matching the countries grammar will be considered as a valid result. Disable this option to consider valid any read regardless there was a match or not among the countries list. Important: False positives may arise when this option is unchecked. The recommendation is to leave this ON in free-flow mode and OFF in triggered mode Minimum number of characters Adjust plate number of potential characters VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 11 VaxALPR On Camera User Manual 1.0 Minimum Number of Plate Characters: Minimum number of characters needed to be considered a valid plate. Maximum Number of Plate Characters: Maximum number of characters to be considered a valid plate. Read double line plates Check this option to read plates with 2 lines. Important: Uncheck this option if you do not consider reading squared plates 5.1.2 Environment Options Resolution Display the list of available resolutions suitable for VaxALPR On Camera. Important: This resolution does not necessarily has to match the resolution set in the camera main stream. To have an idea of what the scenario looks like it is recommended to set the camera main stream to the same as you’re setting for the OCR. This way you can check the real video “as is” from Axis Live Video View Minimum number of characters and slope angle Adjust the range of characters height in pixels Minimum and Maximum Character Height (12-70 pixels): Minimum and maximum height in pixels of the plate characters. To obtain a better performance of the application, it is recommended a distance between 8 and 10 pixels from the minimum to the maximum values set. Check Annex III. Important: The more you narrow this range the faster and accurate the OCR will run. Skip setting ranges such as min 14 and max 70 or similar unless it is necessary. If plate characters fluctuate between 22 and 28 for instance, set 20 and 30 rather than 14 and 70 Maximum Slope Angle (0-40 degrees): Maximum slope allowed for the application. A slope over 30 degrees is not recommended Repeated plates Minimum elapsed time to output the same plate (again) Same Plate Delay (seconds): Time elapsed before the same plate is re-sent as a valid results. It is recommended to set this option to 0 seconds in triggered mode. For example, if the plate appears in the screen 10 second and the same plate delay is set in 2 seconds, the same plate will be throw up 5 times. VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 12 VaxALPR On Camera User Manual 1.0 5.1.3 OCR Options Minimum Global Confidence (0-100): Minimum confidence needed in a plate recognition to be a valid result. The global confidence is the average of the characters confidence. Minimum Character confidence (0-100): Minimum confidence needed in a character to be set as valid. Mode: o Free-Flow: The ANPR works in continuous mode and does not require any trigger to operate. All plates read are reported in real time. o Triggered: The application work in triggered mode using physical IO ports or Axis virtual ports (see section 5.1.4). When the trigger event is set, the application will perform a recognition and return the captured plate. If the system doesn’t recognize a plate an event with “NONE” plate number is launched. o Axis Motion Detection: The motion detection activate the free-flow reading. The application will recognize plates only when “Axis Motion Detector” event is active. 5.1.4 Triggered Options Port number: Camera port number. Is a virtual Port: When checked, the port number is set as virtual port. 5.1.5 Reporting Options Write results to SD: When checked, the camera will save a JPEG image on each recognition to the SD card in the camera. The images are stored in the folder “/areas/Vaxreader/<date>/” inside the SD, and the image file name is set to HHMMSSPLATE.jpg in UTC time. Send VAPIX / ONVIF events: When checked, the camera will send VAPIX / ONVIF event on each recognition. The message format is detailed in the section 6. o ID: Numeric ID. Each report will use this ID as source. Send Milestone or POST events: When checked, the camera will send a HTTP POST notification to the Host, Port and Route specified bellow. The message posted is a wellformed XML following the format specified in the Annex II. o HOST: IP or hostname of the destination. o Port: Destination port. o Camera IP or ID: Public IP of the AXIS camera. Milestone will use this field to identify the source of the event. VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 13 VaxALPR On Camera User Manual 1.0 o Route: The URL where the notification will be sent. Set this field to “/” in case that the HOST is a Milestone server. Send proprietary events: When checked, the camera will send a notification to the Host and Port specified bellow. The format of this notification is specified in the annex I. o HOST: IP or hostname of the destination. o Port: Destination port. o ID: Numeric ID. Each report will use this ID as source. For .NET developers you can download VaxAlprRemotePlateParser.dll class library from our web site to parse incoming raw data messages from VaxALPR On Camera and get an easy to manage object with all results accessible to class members. The process is as follows: - Get proprietary notification from VaxALPR On Camera in raw format (Annex I) - Send the full message data to the DLL parser and get a plate result instance. Class members are “GetPlateNumber()”, “GetOCRImage()”, “GetCountry()” and so on… VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 14 VaxALPR On Camera User Manual 1.0 5.2 Region of interest configuration (ROI) To define a new region of interest follow the next steps: 1. Click on the video image to draw the polygon. Each click will add a new node to the polygon. The polygon will be draw in red color. 2. To restart the polygon press “Clear current ROI” button. 3. To finish the definition of the ROI press the “Save ROI” button. The ROI polygon will turn green if set correctly. To delete an existing ROI: 1. Press the “Delete ROI” button. The defined ROI will be erased from the video image. Region of Interest Configuration Important: A well-defined region of interest may shoot up the OCR performance. Use this tool anytime you can, but beware with small regions. Try to maximize the potential recognition area within the polygon while excluding zones where the plate won’t ever appear. The view in the ROI matches the camera main stream resolution, not the one set from the OCR menu. However, the selected region will be valid under the OCR’s. If you would like to visualize exactly the same OCR view, please set both camera main stream and OCR to the same resolution. VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 15 VaxALPR On Camera User Manual 1.0 6. VaxALPR On Camera events definition VaxALPR can communicate with third party applications using a VAPIX notification. The definition of the event is: <!—VaxALPR On Camera Event --> <Declaration> <Item> <Key NameSpace="tnsaxis">topic0</Key> <String>CameraApplicationPlatform</String> </Item> <Item> <Key NameSpace="tnsaxis">topic1</Key> <String>Analysis</String> </Item> <Item> <Key NameSpace="tnsaxis">topic2</Key> <String>ALPR</String> </Item> <Item> <Key>id</Key> <Integer/> <Tag>onvif-source</Tag> </Item> <Item> <!-- The plate string --> <Key>plate</Key> <String/> <Tag>onvif-data</Tag> </Item> <Item> <!-- Video timestamp --> <Key>timestamp</Key> <Double/> <Tag>onvif-data</Tag> </Item> <Item> <!-- Country --> <Key>country</Key> <String/> <Tag>onvif-data</Tag> </Item> <Item> <!-- Global confidence --> <Key>confidence</Key> <Double/> <Tag>onvif-data</Tag> </Item> <Item> <!-- Characters confidence --> VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 16 VaxALPR On Camera User Manual 1.0 <Key>charconfidence</Key> <String/> <Tag>onvif-data</Tag> </Item> <Item> <!-- Average Char Height --> <Key>charheight</Key> <Double/> <Tag>onvif-data</Tag> </Item> <Item> <!-- Process Time --> <Key>processtime</Key> <Double/> <Tag>onvif-data</Tag> </Item> <Item> <!-- Plate location --> <Key>left</Key> <Integer/> <Tag>onvif-data</Tag> </Item> <Item> <!-- Plate location --> <Key>top</Key> <Integer/> <Tag>onvif-data</Tag> </Item> <Item> <!-- Plate location --> <Key>right</Key> <Integer/> <Tag>onvif-data</Tag> </Item> <Item> <!-- Plate location --> <Key>bottom</Key> <Integer/> <Tag>onvif-data</Tag> </Item> <Item> <!-- ROI ID (unused) --> <Key>roi</Key> <Integer/> <Tag>onvif-data</Tag> </Item> </Declaration> VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 17 VaxALPR On Camera User Manual 1.0 7. VaxALPR On Camera Viewer You can download this free application from our website to monitor plates read by VaxALPR On Camera. You shall activate proprietary notifications from the OCR configuration menu. 1. Go to VaxALPR On Camera configuration menu. 2. Go Notifications and select Send Proprietary Notifications a. HOST: The computer IP where you’re running VaxALPR On Camera Viewer b. PORT: Selected port number c. ID: Number such as 1,2,3… 3. Run VaxALPR On Camera Viewer in your PC 4. Set the port number the same number you put in the camera PORT notification 5. Press the button “Start Listening” to capture the plates read from the camera 8. Tips and basic troubleshooting guide You can use this guide to help you identify and resolve basic problems you may be experiencing with the VaxALPR On Camera application. I launch VaxALPR and stops suddenly Make sure the license installed is valid The software is running OK but it’s reading nothing Can you see the plate with your eyes in the image? If the answer is NO, adjust the zoom and focus to visualize the plate… if it’s YES, continue reading… Assuming the countries list is correct… we’re going to set the parameters as much global as possible and we’ll refine later… 1. Decrease confidence levels: 25 per character and 50 global VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 18 VaxALPR On Camera User Manual 1.0 2. Increase characters height range to something between 14 and 60 pixels 3. Disable grammar strict 4. Remove any existent ROI Now it’s working OK… Then we can refine the parameters - Check the “log” to visualize the characters plate height to narrow the min/max range. [INFO] Vaxreader: Plate 0 (<pixel height> - <milliseconds>): <plate> - Do not make the ROI very strict - Increase confidence level: 40 per character and 70 global - Enable grammar strict Now it’s working OK… but missing many plates Assuming the OCR configuration is OK, check the log to display OCR recognition time and make sure the ROI is correctly set. Please make sure vehicles are not moving at medium-high speed or the cameras has a very large resolution that slows down the OCR processing. Still not working fine… Some tips about the camera settings - The camera resolution impacts dramatically in OCR performance. If you have set 1.2 Mpix and get plates 40 pixels height, it’s recommended to set 0.6 Mpix and get 20 pixels height plates. - The maximum gain recommended (Video&Audio->Camera Settings->Exposure Settings) should be around 9 dB - Shutter recommendation: fixed within this range: a. 1/250: When the vehicle will stop in front of the camera. b. 1/500: When the vehicle speed is lower than 40 km/h. c. 1/1000: When the vehicle speed is higher than 40 km/h. VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 19 VaxALPR On Camera User Manual 1.0 ANNEX I Each time VaxALPR On Camera recognizes a new plate, the application will open a TCP/IP communication, send the following message and close the connection. Message format: - 4 bytes, int32 => 0xCAFEBABE is the start message header identifier (fixed) - 4 bytes, int32 => 0xBABE10 result message (fixed) - 4 bytes, int32 => VaxALPR instance ID, matches the tag Instance-ID from VaxALPR configuration file - 8 bytes, int64 => Time Stamp, current date in milliseconds - 4 bytes, int32 => NC1: number of ASCII characters of the plate number - NC1 bytes, byte => ASCII bytes array - 4 bytes, int32 => NC2: number of ASCII characters of the plate origin - NC2 bytes, byte => ASCII bytes array - 4 bytes, int32 => ROI ID containing the license plate (1…n). 0 value means plate out of any ROI (Unused) - 8 bytes, double => Global confidence of plate recognition: [0...100] - 8 bytes, double => Characters height, in pixels - NC1 bytes, float => per character recognition confidence [0…100] - 8 bytes, double => OCR processing time, in milliseconds - 4 bytes, int32 => 'x0' coordinate of the plate left-top corner, in pixels - 4 bytes, int32 => 'y0' coordinate of the plate left-top corner, in pixels - 4 bytes, int32 => 'x1' coordinate of the plate right-bottom corner, in pixels - 4 bytes, int32 => 'y1' coordinate of the plate right-bottom corner, in pixels - 8 bytes, int64 => OCR image timestamp, in milliseconds - 4 bytes, int32 => SF: size of the OCR image, in bytes - SF bytes, byte => OCR image data in JPEG format - 4 bytes, int32 => R1: size of image reserved data, in bytes - R1 bytes, byte => reserved data, R1 bytes - 8 bytes, int64 => Environment image timestamp, in milliseconds (Unused) - 4 bytes, int32 => SF: size of the environment image, in bytes (Unused) - SF bytes, byte => Environment image data in JPEG format (Unused) - 4 bytes, int32 => R2: size of image reserved data, in bytes (Unused) - R1 bytes, byte => reserved data, R2 bytes (Unused) - 4 bytes, int32 => vehicle direction, if available: 0=>unknown, 1=>closer, 2=>farther (Unused) - 4 bytes, int32 => ALPR multi-plate rate (Unused) - 4 bytes, int32 => 1: plate reported under SYNCHRO_SIGNALED mode, 0: SYNCHRO_FREE_FLOW mode - 4 bytes, int32 => N: Size of reserved space - N bytes, byte => reserved space, user information. Put here custom information - 4 bytes, int32 => 0x42F87D89 is the end message header identifier (fixed) VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 20 VaxALPR On Camera User Manual 1.0 ANNEX II Each time VaxALPR On Camera recognizes a new plate, the application will send a POST notification with a well-formed XML. The XML follow the schema defined in the AnalyticsEvent.xsd available at www.vaxtor.com website. The following XML is an example of a response for plate number M8016LS. The bounding box is referred to the snapshot in the message. <?xml version="1.0" encoding="utf-8"?> <AnalyticsEvent xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:milestone-systems"> <EventHeader> <ID>00000000-0000-0000-0000-000000000000</ID> <Timestamp>2016-05-23T08:39:36.135998Z</Timestamp> <Type>License Plate Recognition</Type> <Message>VaxALPR On Camera Event</Message> <CustomTag>M8016LS</CustomTag> <Source> <Name>192.168.0.100</Name> </Source> </EventHeader> <Description>M8016LS</Description> <ObjectList> <Object> <Name>Plate</Name> <Confidence>0.972857</Confidence> <Value>M8016LS</Value> <AlarmTrigger>true</AlarmTrigger> <Size>46</Size> <BoundingBox> <Top>0.42</Top> <Left>0.23</Left> <Bottom>0.54</Bottom> <Right>0.55</Right> </BoundingBox> </Object> </ObjectList> <SnapshotList> <Snapshot> <TimeOffset>0</TimeOffset> <Width>1280</Width> <Height>960</Height> <SizeInBytes>193656</SizeInBytes> <Image>BASE64ENCODEDJPEG</Image> </Snapshot> </SnapshotList> <Vendor> <Name>Vaxtor Systems</Name> </Vendor> </AnalyticsEvent> VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 21 VaxALPR On Camera User Manual 1.0 ANNEX III To check the height in pixels of the plate characters it is recommended to capture a frame of the video feed and measure the height with an external program like Microsoft Paint. It is also possible to set the maximum and minimum height to 70 and 12 pixels respectively and check in the log file the recognized values. This option will not work if the plate is bigger than 70 pixels or lower than 12. Log button Log file VaxALPR On Camera User Manual Version 1.0 – May 2016 VAXTOR SYSTEMS. Ronda de Poniente 15, 1º. Tres Cantos – SPAIN Phone number: +34 91 757 22 11 -- e-mail: [email protected] – web: http://www.vaxtor.com 22
