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Camera Calibration

Camera Calibration

Camera calibration is required in order for the VCA engine to classify objects into different
object classes. Once the camera has been calibrated, the engine can infer real-world object
properties such as speed, height and area and classify objects accordingly.

Camera Calibration Topics



Calibration Page Elements



Calibrating a Camera



Advanced Calibration Parameters



Vertical Field of View



Measurement Units

Calibration Page Elements

The following describes the purpose of each element of the calibration page. To get started
calibrating straight away, see the

Calibrating a Camera

topic.

3D Graphics Overlay

During the calibration process, the features in the video image need to be matched with a
3D graphics overlay. The 3D graphics overlay consists of a green grid that represents the
ground plane. Placed on the ground plane are a number of 3D mimics that represent the
dimensions of a person with the current calibration parameters. The calibration mimics are
used for verifying the size of a person in the scene.

Mouse controls

The calibration parameters can be adjusted as follows:



Click and drag the ground plane to change the tilt angle.



Use the mouse wheel to adjust the camera height.



Drag the slider to change the vertical field of view.

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Содержание PIXELPRO SERIES

Страница 1: ...H 264 NETWORK CAMERA VCA Interface Manual ...

Страница 2: ......

Страница 3: ...abling Metadata Streaming 16 Configuration of Zones and Rules 19 Configuration of Zones and Rules 19 Tracking Display 19 Properties Inspector 19 Event History 20 Customizing the Tracking Display 20 Display Blobs 20 Display Objects in Multiple Colors 20 Display Non Alarmed Objects 21 Display Object Height 21 Display Object Speed 21 Display Object Area 21 Display Object Classification 21 Display Obj...

Страница 4: ...ke Detection 40 Fire Detection 41 Object Colour Filter 43 Counters 45 Counters 45 Creating Counters 45 Assigning Rules to Counters 45 Incremental Counters 46 Decremental Counters 46 Occupancy Counters 46 Counter Storage and Reporting 47 Counter Storage and Reporting 47 Database Service 47 Reporting Service 47 Database Service 47 Enable Database Service 48 DB Storage 48 Total DB Size 48 Database Ta...

Страница 5: ...ameters 64 Vertical Field of View 65 Measurement Units 65 Object Classification 67 Object Classification 67 Tamper Detection 69 Tamper Detection 69 Advanced Tamper Detection Settings 69 Scene Change Detection 71 Scene Change Detection 71 Manual Scene Change Detection Settings 71 Burnt in Annotation 73 Burnt in Annotation 73 Object Configuration 73 Counter Configuration 74 System Configuration 74 P...

Страница 6: ...9 Camera Installation Mode 90 Auto Disable 90 Performance 91 Maximum Frame Shift 91 Generating External Event Notifications 93 Load and Save VCA Settings 95 Saving VCA Settings 95 Loading VCA Settings 95 Advanced VCA Settings 97 Alarm Holdoff Time 98 Measurement Units 100 Metadata Format 100 Event 100 Object 100 Counting 100 Statistics 101 Do not send empty metadata packets 101 Blob 101 Tamper Dia...

Страница 7: ...Table of Contents vii Minimum Alarm Object Display Time 102 Minium Object Display Time 102 Detection Point of Tracked objects 102 Restore All Default Settings 103 ...

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Страница 9: ...directionality constraints object counting loitering object type and object speed Multiple filters are supported on any combination of multiple overlapping detection zones VCApro includes all of the features of VCAsurveillance in addition to an advanced people tracking engine optimized for tracking people in cluttered indoor scenes such as retail scenarios Includes specific high accuracy counting ...

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Страница 11: ...ware version that contains the VCAsys engine Obtain an activation code for the feature set required The different feature levels available for different platforms are described in the VCA Feature Packages topic Connect power network and input video Activate the VCAsys engine Calibrate the unit VCAsurveillance only Configure the detection rules Configure the alert output format ...

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Страница 13: ...5 VCA Feature Packages VCA functionality is available in a range of different packages and on different platforms The license types available for IP and PC platforms are listed in the following table ...

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Страница 15: ...7 Accessing VCA Configuration All configuration of the VCAsys engine is performed by accessing the VCA section of the unit setup page ...

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Страница 17: ... your hardware supplier Applying an Activation code to the unit Obtaining an Activation Code Before VCAsys can be enabled it must be activated Typically an activation code is supplied by the hardware provider upon receipt of a valid product token and a unique hardware ID generated by the unit on which VCAsys is to be activated The activation process is outlined as illustrated ...

Страница 18: ...tation 10 Applying an Activation Code to a Unit Once an activation code has been received from your hardware supplier it s simply a case of entering the code on the appropriate web page Select the the Activation menu ...

Страница 19: ...Activation 11 Enter the activation code and click Apply If the activation code is valid the activated features will be displayed in the Installed Licenses box ...

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Страница 21: ...ed ALL VCA functionality will be disabled Object Tracking Check Uncheck to enable disable the object tracking engine When checked there are 2 modes of object tracking available optimized for different applications Surveillance Tracking Optimized for intrusion detection and general purpose outdoor object detection and tracking When objects are in close proximity to each other they are more likely t...

Страница 22: ...red by the other NOTE The People Tracking engine consumes more system resources than the Surveillance Tracking engine Therefore the encoded frame rate may be reduced if this mode is selected Best performance is achieved when the camera has been correctly calibrated The People Tracking engine requires a VCApro license The following illustration highlights the difference in performance between the t...

Страница 23: ...Enabling VCA 15 Abandoned Removed Object Detection Check Uncheck to enable disable abandoned removed object detection When checked a background process to detect abandoned and removed objects is enabled ...

Страница 24: ...ety device It should be installed in addition to certified safety devices and used only to supply additional information Camera Shake Cancellation The camera shake cancellation function is used to improve the VCA performance with cameras that are prone to shake By default camera shake cancellation is disabled If your installation suffers from camera shake problems enable this function to improve t...

Страница 25: ...Enabling VCA 17 ...

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Страница 27: ...cts that have not triggered a rule are displayed in yellow This snapshot shows a detection zone in red and a detection line in green The tracking display window is useful for predicting how the rules will operate By examining how the trails of the objects intersect the detection zones and lines it is possible to determine how the rule can be optimally configured Properties Inspector The properties...

Страница 28: ...show various levels of tracking data Simply right click on the tracking display window and select the Display option Display Blobs By default the blobs are not displayed It s possible to switch the blob display on in order to observe how the algorithm performs in different scenarios Moving blobs are displayed in blue as illustrated in the figure Blobs that correspond to abandoned removed objects a...

Страница 29: ...Object Speed Check this option to display the object speed This option is only available when the camera has been calibrated Display Object Area Check this option to display the object area This option is only available when the camera has been calibrated Display Object Classification Check this option to display the object classification This option is only available when the camera has been cali...

Страница 30: ...fined Detection zones define an area of interest Detection lines are similar to detection zones but they define a perimeter instead of a region Creating a Zone or Line To create a zone either double click the left mouse button or right click and select Zone Line Create zone To create a line right click and select Zone Line Create line ...

Страница 31: ...shape of a zone or line simply grab a node with the left mouse button and drag it to the desired location Adding and Removing Nodes Zones and lines can be tailored to any scenario by simply adding more nodes to define the shape required To add a node simply double click on the zone or line at the point where the new node should be added Nodes can be deleted by right clicking on the node and select...

Страница 32: ... areas can interfere with detection zones in other areas For example on a windy day moving foliage can generate false alarms that in some situations could be tracked through a detection zone In order to minimize such issues it is possible to configure non detection zones where nothing is detected or tracked Detection Rules ...

Страница 33: ...o the zone selected As different zones lines are selected so the properties inspector changes to reflect the rules currently configured on that zone Defining a rule is a simple matter of checking the box next to the rule required In all cases the rules are configured with sensible default values Of course these can be customized to suit the detection scenario The selection of multiple rules on a d...

Страница 34: ...io Objects that travel in the configured direction within the limits of the acceptance angle through a zone or over a line trigger the rule and raise an alarm Object Enter and Exit Enable the object enter and exit detection by checking the corresponding check boxes in the properties inspector and click apply An object entered alarm is raised when an object crosses from the outside to the inside of...

Страница 35: ...etection zone Note that this is different from object entered detection since the object must be initially detected inside the zone without entering e g people appearing in a doorway or cars appearing from an underground carpark Conversely an object disappear alarm is raised when an object disappears inside a detection zone Again this is different from object exit detection since the object must b...

Страница 36: ...l Enable the object dwell rule on the selected zone by checking the Dwell box in the properties inspector and click apply Objects that dwell inside a zone for longer than the defined amount of time will trigger the rule and raise an alarm ...

Страница 37: ...gger the rule and raise an alarm The stopped time can be configured by simply clicking in the Time box on the rule control and editing the value in place Object Class Once the camera has been calibrated it s possible to include or exclude specific object types in the detection rules Select and enable an Object Filter by checking the box Select whether the rule should include or exclude the object ...

Страница 38: ...ed as an object crossing a line or zone within a certain time after an object has already crossed the line or zone If an object crosses a line or zone and another object crosses the same line or zone within the specified time window the Object Tailgating filter will be triggered In this example Object 1 is about to cross a detection line Another object Object 2 is following closely behind The tail...

Страница 39: ...ion Since the counting line exhibits higher performance when detecting multiple objects crossing a line best performance will be obtained when the trigger is set to Counting Line If a counting line filter is already configured on the line then the trigger is automatically set to Counting Line Note that a VCApro VCAaccess or VCAcount license is required to enable the counting line ...

Страница 40: ...g an abandoned or removed object Suspicious objects can be detected when carried into the scene and planted by a person as well as when dropped or thrown into the scene Ensure that abandoned removed object detection is enabled by checking the Abandoned removed object detection box on the VCA Enable Disable page ...

Страница 41: ...del that is constructed over time When an object is inserted into the background abandoned it looks the same to the algorithm as when an object is removed from the background Enable the abandoned removed object rule on the selected zone by checking the Abandoned Removed Object box in the properties inspector An object that is left inside a zone for longer than the configured time period will trigg...

Страница 42: ...0 seconds but this can be changed on the advanced settings page Diagnostic Data In order to evaluate the performance of the abandoned removed object detection and troubleshoot issues in challenging circumstances it s possible to enable the display of blobs The blobs show the underlying pixels detected as interesting by the algorithm Note that the blobs must be enabled to be transmitted in the meta...

Страница 43: ...detection scenario Objects that travel within the bounds of the configured speeds through a zone or over a line trigger the rule and raise an alarm Note that the camera must be calibrated for this function to be available Counting Line A counting line is a detection filter optimized for bi directional object counting e g people or vehicles in busier detection scenarios Examples of such application...

Страница 44: ...el is 5 Enabling the Counting Line Enable the counting line filter on a detection line in the desired direction s by checking the appropriate box in the properties inspector An event is generated every time an object crosses the line in the selected direction If multiple objects cross the line together multiple corresponding events are generated The events generated by the counting line can be tie...

Страница 45: ... of the expected object This allows the counting line to reject noise and also count multiple objects To calibrate the counting line Select the counting line with the mouse Check the Width Calibration box under the Counting Line rule in the property inspector Use the mouse wheel or drag the calibration markers to adjust the distance between the calibration markers until the distance is approximate...

Страница 46: ...d be enabled by selecting the Shadow Filter check box for the line It is recommended that the shadow filter only be enabled when shadows are present because the algorithm can mistake certain parts of an object for shadows and this may lead to worse counting results Calibration Diagnostics Mode To enable the user to more accurately configure the calibration for the counting line there is a diagnost...

Страница 47: ... The last 5 detections are displayed for each direction with the latest one appearing closest to the counting line Each detection is counted as a number of objects based on the current width calibration This is shown as follows Black line Event not counted Solid white line Event counted as one object Broken white line Event counted as multiple objects indicated by the number of line segments Using...

Страница 48: ...d should not be used as a safety device It should be installed in addition to certified safety devices and used only to supply additional information Diagnostic Data In order to evaluate the performance of the smoke detection and troubleshoot issues in challenging circumstances it s possible to enable the display of smoke blobs The blobs show the underlying pixels detected as potentially being smo...

Страница 49: ...nding detection zone alerts are raised in the alarm log window The Time setting specifies how long fire must be detected for before the fire event is raised WARNING The fire detection filter does not comply with any detection standards and should not be used as a safety device It should be installed in addition to certified safety devices and used only to supply additional information ...

Страница 50: ...es it s possible to enable the display of fire blobs The blobs show the underlying pixels detected as potentially being fire by the algorithm Note that the blobs must be enabled to be transmitted in the metadata on the advanced settings page for them to visible on the annotation overlay Blobs that are potentially detected as fire are displayed in red ...

Страница 51: ...VCA Enable Disable page Enable the object colour filter by checking the corresponding box in the properties inspector and click apply Specify the colour and threshold amount of colour within an object detection properties An object colour filter alarm is raised when an object that contains more than the specified threshold of the specified colour is tracked inside the zone ...

Страница 52: ...tadata stream The colour signature can be displayed as an overlay on the screen to help the selection of the parameters for the colour filter In order for the colour signature to be displayed the colour signature must be enabled in the metadata settings on the advanced page and the option to display the colour signature should be selected ...

Страница 53: ...es to Counters Creating Counters To create a counter simply click the right mouse button and select Counters Add Counter The counter name can be changed by clicking in the Name box on the rules control Assigning Rules to Counters Counters count triggers generated by rule violations For example if it is required to count the number of objects entering a zone a zone must initially be configured to r...

Страница 54: ...ounters When a zone is assigned to an incremental counter the count will increment by 1 every time the zone is triggered Decremental Counters When a zone is assigned to a decremental counter the count will decrement by 1 every time the zone is triggered Occupancy Counters When a zone is assigned to an occupancy counter the counter displays the number of active triggers in the zone E g if there are...

Страница 55: ...ter storage and reporting functionality The configuration of the counter storage and reporting module comprises 2 areas The database service The reporting service Database Service The database service manages up to 4 databases It logs the values of all configured counters to the database at pre configured regular intervals See the Database Service Configuration page for more details Reporting Serv...

Страница 56: ... internal flash SD card or USB memory stick If the selected memory device is not available internal flash will be used instead The in use label shows which storage medium is currently being used to store the database tables Total DB Size The maximum size of the database when internal flash is selected as the storage medium is 512KB The display shows how much storage is in use out of the total avai...

Страница 57: ... to the table the table wraps around and overwrites the oldest data Max Roll over Time Shows the maximum time that the table will hold counting data for Calculated as follows Max Roll over Time minutes Sampling Interval x Roll over Count Database Management Functions for managing the database Clear Wipes all data from all database tables Backup Allows the user to download a backup of the database ...

Страница 58: ...e are a number of pre defined requests that offer quick and easy way to get started Every element on the counter reporting page has context sensitive help just hover the mouse over the item in question to get detailed information about the values that can be entered into that field Tabular Reporting Enter the query parameters and click the Table button The data is displayed as a table ...

Страница 59: ...rage and Reporting 51 Bar Graph Reporting Clicking the Bar button pops up a new window with a bar graph of the results The colour of each bar matches the colour of the counter on the Zones Rules configuration page ...

Страница 60: ...Printed Documentation 52 CSV Export Clicking the CSV button offers a file that contains the results of the query in comma separated variable format ...

Страница 61: ...e The requests available are Predefined Request From To Default Sampling Period One hour now 1 hour now 1 minute Table 0 Today today 0 00 now 10 minutes Table 1 Yesterday yesterday 0 00 today 0 00 10 minutes Table 1 One day now 1 day now 10 minutes Table 1 This week sunday 0 00 today 60 minutes Table 2 Last week Last sunday 0 00 Last saturday 24 00 60 minutes Table 2 One week now 1 week now 60 min...

Страница 62: ...21 0 00 yesterday 0 00 on the day before today yesterday means 2011 10 20 0 00 sunday monday Any day of the week 0 00 thursday means 0 00 on the previous Thursday this_week 0 00 on the first day of the week this_week means 0 00 on the previous Sunday last_week 0 00 on the first day of last week last_week means 0 00 on the Sunday before last this_month 0 00 on the first day of this month this_month...

Страница 63: ...rst Value Type Specifies the results returned should be absolute counts or the difference between the current and previous sample Can be one of Value Type Details absolute The actual counter values are returned difference The difference between this and the previous sample is returned Request Click one of these buttons to generate either a table bar chart or CSV output based on the specified query...

Страница 64: ...extract a real time data feed from one or many cameras and then use Excel s powerful data analysis functions to perform further data processing On the counter reporting page set up the query to generate the data view required Then copy the URI from the Request URI box to the clipboard Open up Excel and import the data feed as illustrated below ...

Страница 65: ...Counter Storage and Reporting 57 The data is then displayed in Excel and can be processed further In this example the three counters have been added to a bar chart ...

Страница 66: ...Printed Documentation 58 ...

Страница 67: ...tion page To get started calibrating straight away see the Calibrating a Camera topic 3D Graphics Overlay During the calibration process the features in the video image need to be matched with a 3D graphics overlay The 3D graphics overlay consists of a green grid that represents the ground plane Placed on the ground plane are a number of 3D mimics that represent the dimensions of a person with the...

Страница 68: ...zon is visible in the video it is possible to use this to set the tilt angle Drag the grid until the horizon in the video matches the graphical horizon Additional Mimics Additional mimics can be added to verify the calibration configuration Select the Add Mimic option from the menu Grid Transparency By default the ground plane is displayed in transparent mode such that the video is clearer The tra...

Страница 69: ...urement stick that measures the distance between two points along the ground plane not heights To use the virtual ruler simply right click anywhere a point on the ground plane to anchor one end of the ruler and select the option from the menu It is then possible to move the other end of the ruler around the ground plane to measure the distance between the anchor point and the current mouse positio...

Страница 70: ...ly the changes If however you do not know or are unable to find out the camera parameters this topic provides a step by step guide to calibrating a camera Step 1 Find some people in the scene Find some people or some people sized objects in the scene Try to find a person near the camera and a person further away from the camera It is useful to use the Video Control button to pause the video so tha...

Страница 71: ...e other two parameters Click and drag the ground plane to change the tilt angle use the mouse wheel to adjust the camera height and drag the slider to change the vertical field of view The 3 calibration parameters will be reflected in the edit boxes in the Camera Setup section of the web page Apply the changes Once the changes have been applied the Calibration Status reflects whether the operation...

Страница 72: ...between Metric and Imperial please refer to the Measurement Units Topic Tip If it all goes wrong If you find that the mimics get lost or disappear due to an odd calibration configuration the process can be restarted by clicking the Restore Defaults button Advanced Calibration Parameters The advanced calibration parameters allow the ground plane to be panned and rolled without affecting the camera ...

Страница 73: ...wing table given the vertical image dimension and its focal length If you are unable to determine the vertical field of view for your camera from the above table leave the field of view at its default setting 40 Measurement Units The height area and speed annotation can be displayed in metric or imperial units By default the system displays metric units To change the measurement units select the A...

Страница 74: ...Printed Documentation 66 ...

Страница 75: ...re loaded with the most common object classes and in most cases these will not need to be modified In some situations it might be desirable to change the classification parameters or add new object classes To adjust the object class settings select the Classification page and the object class to modify Adjust the minimum and maximum object speed and area and apply the changes Objects that do not f...

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Страница 77: ...n the image Tamper Debug metadata must be enabled on the VCA Advanced page Please refer to Advanced Settings for more information Advanced Tamper Detection Settings In the advanced tamper detection settings it is possible to change the thresholds for the area of the image which must be changed and the length of time it must be changed for before the alarm is triggered Tampered Duration until Alarm...

Страница 78: ...h as switching on off indoor lighting can cause false tamper alarms Enable this option if this is likely to be a problem in the area where the camera is installed However this option will reduce sensitivity to genuine alarms so it is not recommended if fast light changes are not likely to be a problem ...

Страница 79: ... used by the scene change detection algorithm Disabled Scene change detection is disabled Note In order to see the output of the scene change detection on the image Scene Change diagnostics metadata must be enabled on the VCA Advanced page Please refer to Advanced Settings for more information It s only possible to see the detection diagnostic data when in Manual mode Manual Scene Change Detection...

Страница 80: ... 72 If false scene change detections are a problem the time and or area should be increased so that large transient changes such as a close object temporarily obscuring the camera do not cause false scene change detections ...

Страница 81: ...ting allows the VCA annotation to be burnt in to the raw video stream The annotation can include tracked objects counters and system messages The Burnt in Annotation can be enabled for compressed video streams or the analogue video output if supported Object Configuration ...

Страница 82: ...In multi color mode the object colors are selected automatically by the system Counter Configuration Select the counter properties to display The counter text size can be changed according to the user s preferences System Configuration Select whether to display system messages The system message text size can be changed according to the user s preferences The following image illustrates how burnt ...

Страница 83: ...Burnt in Annotation 75 ...

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Страница 85: ...ce the VCA configuration is scene dependent e g zone configuration is only valid when the PTZ is pointing at the same position the VCA can be configured such that all VCA functionality is related to a single PTZ preset This is the so called camera preset for VCA home position Enable VCA Only at Home Position When checked VCA will be only enabled when camera is at the VCA home preset position If th...

Страница 86: ...reset home position VCA will not be automatically re enabled The only way to re enable VCA in this mode is to manually return the camera to the VCA home preset position PTZ Auto tracking Configuration PTZ auto tracking allows a compatible PTZ camera to track a moving subject in real time When a subject is detected the PTZ camera zooms in on the subject and moves to track it such that it remains in...

Страница 87: ...or erratic PTZ behavior if autotracking is also enabled Auto tracking Initiation PTZ autotracking can be initiated in three different ways Start tracking when any object is detected The auto tracking will start automatically and track the first object detected by the VCAsys tracking engine normally from the VCA home preset position The Start auto tracking when any selected rule triggered checkbox ...

Страница 88: ...r this has to be accounted for by means of a PTZ profile The PTZ profile is a collection of camera specific settings that define the characteristics of a particular PTZ camera The device contains profiles for cameras that have already been tested but new profiles can be created and or uploaded if the camera does not appear in the list of pre tested profiles PTZ profile configuration consists of fo...

Страница 89: ...reated in the text box 2 Click the Create button The new PTZ profile will be created and stored in the list of available PTZ profiles Editing an Existing PTZ Profile Note Only PTZ profiles that have been created by the user can be edited There are a number of PTZ profiles that come as standard and these cannot be changed by the user ...

Страница 90: ...Printed Documentation 82 PTZ General Info Specifies general information related to the PTZ camera profile Version The PTZ profile version ...

Страница 91: ... min max speed over the range 0 100 However some cameras may exhibit non linearities and may not start moving until they reach a pre defined minimum threshold Maximum pan tilt speed The maximum speed that should be used by the PTZ algorithm to control the pan tilt motors as a percentage of the maximum speed of the PTZ camera It should be set to correspond to a pan tile movement of 30 sec when the ...

Страница 92: ...ts Minimum target size for zooming in Minimum target size percentage of image width height to trigger the camera to zoom in normalized as a percentage 0 100 Any object size smaller than this value will cause the camera to zoom in The default value is 20 Maximum target size for zooming out Maximum target size percent of image width height to trigger the camera to zoom out normalized as a percentage...

Страница 93: ...he estimated absolute position P T Z instead of zooming in gradually Maximum optical zoom value Specifies the maximum optical zoom value for the camera e g 36 for a 36x optical zoom camera This parameter only has an effect when absolute positioning is enabled Please refer to the camera specification Camera movement latency The time delay in milliseconds that it takes from issuing a PTZ command for...

Страница 94: ...from the list of PTZ profiles Auto calibrating a PTZ Profile As well as being able to calibrate a PTZ camera manually it s also possible for the device to try and calibrate the camera automatically Depending on the type of camera all some or none of the PTZ calibration variables can be determined automatically Note Whether a camera can be automatically calibrated or not is highly dependent on the ...

Страница 95: ...s to determine the tracking parameters Once the process is complete each parameter will be labelled as follows The parameter was successfully determined The parameter could not be automatically determined manual calibration required Each parameter labelled with a red cross will need to be determined manually Note that even after a camera has been automatically calibrated its autotracking performan...

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Страница 97: ...use a few seconds pause as the system is re configured Stabilizer Configuration When the stabilizer is enabled an additional configuration page is available under the Stabilizer tab The default options are suitable for most applications and you can make use of the stabilizer functionality without modifying this page Some installations however may benefit from different configurations The figure sh...

Страница 98: ...ation algorithm parameters are optimized to give the best stabilization results for fixed PTZ cameras In vehicle Hand held The stabilization algorithm parameters are optimized to give the best stabilization performance for cameras where the camera fixture experiences continued large displacements or scene changes E g when shot from a moving vehicle Low Frequency Stabilization The Fixed PTZ and In ...

Страница 99: ...king on to the random video noise Similar hunting problems can occur in other situations where a large part of the scene lacks suitable detail for Stabilizer lock Performance Performance setting of the algorithm Better stabilization performance comes at the expense of higher DSP load The default setting is low Maximum Frame Shift This is the maximum amount in image pixels that the algorithm will s...

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Страница 101: ...he VCA alarms to trigger external events e g a relay contact closure a TCP IP message etc To access the event configuration select the Event Configuration menu and then the VCA sub menu The external event notification will be generated every time a VCA alarm is generated ...

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Страница 103: ...s to save By default all VCA settings will be saved The types of settings that can be saved are General General VCA configuration parameters such as on off state VCA mode etc Zones Zones and lines configuration Rules Rules that have been applied to zones and or lines Counters Counters that have been configured against rules Calibration The calibration configuration Classification The classificatio...

Страница 104: ...lick the browse button to select the file to load Select the types of VCA settings to load By default all VCA settings will be loaded and applied to the unit Click the Load button to load the settings and apply them to the unit ...

Страница 105: ...n most installations the default VCA configuration will suffice However in some cases better performance can be achieved with modified parameters The Advanced VCA Settings page allows configuration of the advanced VCA parameters ...

Страница 106: ...Printed Documentation 98 Alarm Holdoff Time The Alarm Holdoff Time defines the time between the successive re triggering of an alarm generated by the same object triggering the same rule ...

Страница 107: ... scenario the person enters the zone 3 times At each point an alarm is raised resulting in a total of 3 alarms With the Alarm Holdoff Time configured it s possible to prevent re triggering of the same rule for the same object within the configured time period Consider the same scenario but with an Alarm Holdoff Time of 5 seconds configured ...

Страница 108: ...oldoff Time is 5 seconds Measurement Units Allows the measurements units to be switched between Metric and Imperial formats For more information please refer to the Measurement Units topic Metadata Format The metadata stream contains a complete description of every moving and stationary target as well as additional diagnostic data to enable troubleshooting and optimum configuration In order to sav...

Страница 109: ... when configuring the tamper detection filter For normal use this option should be disabled due to the increased bandwidth required by the transmission of the tamper detection debug data Counting Line Diagnostics Contains the counting line diagnostic data This can be enabled to show the internal operation of the counting line module This can be useful when determining the optimum calibration width...

Страница 110: ...ing back to yellow The default value is 2000 milliseconds Minium Object Display Time When an object is tracked by the engine it is displayed on the tracking display This setting controls the minimum time an object is displayed in the tracking display This is so that objects that are tracked for a very short time are displayed adequately The default value is 1000 milliseconds Both options affect th...

Страница 111: ...ttom mode Restore All Default Settings This button restores ALL VCA settings to their default values This can be useful if the configuration of a device is in an unknown state Note that by default VCA is switched OFF Therefore VCA will need to be re enabled if all VCA settings are restored to defaults ...

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