Testing Video Analytic Alerting (Agent Vi System)
By: John Honovich, Published on Jun 06, 2010Video analytic debates often center around edge vs core and which is 'best'. By contrast, Agent Vi offers a 'hybrid' solution where part of the analytics runs on third party IP cameras and the remainder is performed on a server. It is definitely a different approach and one which many would like to better understand how it is implemented and how well it works.
In this test of Agent Vi's Vi-System [link no longer available] offering, we examine deploying Agent Vi and its real time alerting for motion detection. We integrate their analytics with the Axis Q1910 thermal camera, the Axis Q1755 HD day/night camera and IQinVision's 752 MP day/night camera. We do not examine Agent Vi's search capabilities, PTZ tracking nor retail analytics (which we plan to cover in later dedicated tests).
Contrast to other analytic tests we have performed including Video IQ's iCVR and Vitamin D's video analytic software.
Agent Vi's video analytics is distributed as software licenses and have an MSRP of $600 - $1000 per camera. Cameras and server purchased separately.
Monitoring with Agent Vi's UI
Key points include:
- Vi-Monitor handles the alarm management for the Agent-Vi analytics
- The list tree shows the associated sensors in the system; In addition, this list serves as a visual indicator to the status of each sensor
- Buttons are available to toggle viewing of the detection zone, people counter, and bounding box around subject
- Live view layouts can be switched to support 1, 4, or 6 camera views
- The event pane lists the triggered alarms from the associated sensors
- The alarm list can be filtered using the buttons below the list
- Use the Classification button to acknowledge an alarm
- VQM (Video Quality Monitors) are automatic rules that report sensor status
- The alarm is verified on the left pane as a preview snapshot: Vi-Monitor does not record live video
- Right click on the alarm and select "Generate Report" to create and export a report of the alarm
- Right click on the preview image to export it as a jpg snapshot
Basic Setup/Configuration of Cameras and Analytics
The following screencast focuses on two components of the Vi-Sentry suite: Vi-Config and Vi-Setup. It's from these two applications all your camera associations, calibrations, rules, and optimizations will occur.
Key points include:
- Agent-Vi analytics software is uploaded to supported IP cameras, but the procedure varies between manufacturers
- In Vi-Config, the list tree displays the available sensors associated to Agent-Vi
- Right click on your Video Sensor and select "Properties" to select the Sensor Type and Environment that is appropriate for the camera
- Each associated sensor needs to be calibrated: You will need a subject in the scene as a reference
- Once sensor type is established and calibration is completed, open the Vi-Setup program to establish the Analytics rules
- In Vi-Setup, the list tree displays the associated sensors
- Click "New Rule" and select a rule type: Choose between Vehicle, Person, or Object
- Establish a detection zone by drawing the borders inside the preview window
- The established rules are now ready to report on the Vi-Monitor alarm management client
Advanced Settings Examined
Key points include:
- Under Detection Parameters for a thermal camera, Agent-Vi recommends to change the sensitivity to High
- For standard d/n cameras, Agent-Vi recommends to leave the sensitivity to Normal
- When sensitivity is adjusted (High, Normal, Low), it impacts the advanced settings
- Agent-Vi recommends formal training for adjusting these advanced settings
- Once a rule is modified, the system immediately takes it into effect
- Increasing the minimal distance yielded less false alerts from swaying trees
- The trade-off is that the analytics may miss a subject or it may take longer for the alert to trigger
- For vehicles, Normal sensitivity has different properties in advanced settings
- Each rule detection type (moving in area, tripwire, crowding, etc) has different advanced parameters available
Examining the Analytics Performance
The following screencast details the series of tests we conducted on the performance of Agent-Vi's analytics. We tested multiple types of cameras with the embedded agent software installed on each type and noted the factors that limit the system's performance.
Key points include:
- The analytics succumb to false alerts from swaying trees
- Performance fairly solid in accurately detecting people
- Analytics not affected by simple light changes
- With a subject walking across a scene at 150 ft distance (d/n cam 70ft fov, thermal 48ft fov) the analytics on both the d/n camera and thermal camera was triggered
- With a subject walking across a scene at 200ft distance (d/n cam 94ft fov, thermal 60ft fov) the analytics triggered an alarm for the thermal but not the d/n camera
- With a subject walking straight towards the camera, analytics took longer to trigger an alarm
CPU Performance Examined
Key points include:
- Two elements to Agent-Vi: The embedded software on the camera, and the server component
- The embedded software on the thermal camera measured a CPU load range between 4% - 9%
- The embedded software on the day/night camera measured a CPU load range between 15% - 20%
- Agent-Vi statistics information can be accessed via web interface, but not all implementations have certain details available
- Agent-Vi reports that 8-10fps is the normal range for processed frames
- On the server side, the Agent-Vi service is called VIAS: CPU consumption was very low
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