EE Webcam Element

Summary ¶

	EE Webcam
Info
Category:	Monitoring		AddIn:	Surveillance
Creator:	OkazoLab		Scope:	Experiment
Owns Snippets:	None		Usage:	Snippets

Properties ¶

Name	Description	Constraints	Type	On runtime change
Settings
Video Device		Normal..	String
Edit Camera Settings	Opens a window with OS settings of the selected video device.	Design Time..	Boolean
Select Video Format	Opens a window with the pin settings of the selected video device.	Design Time..	Boolean
Custom Settings
Use Custom Settings	Define whether custom frame size and framerate are used in capturing video. Using the custom settings is only possible, if it's supported by the selected video device. Otherwise, the device's default settings will be are applied.	Normal..	Boolean
Resolution	Define the resolution of a captured video. The video frames can be scaled to any size in rendering, but choosing a larger resolution improves rendering quality with some cost in performance.	Normal..	clSize
Frame Rate	Define the framerate of video capturing, in frames per second	Normal..	Int32
Runtime Status
XAML Video Viewport	Returns a live XAML control that renders the captured video. The control can be used for data binding to the Content property of the XAML ContentControl element, e.g. . The ContentControl can be added to the status screen or to the GUI Layout element.	Normal..	UIElem..
Actual Settings	Returns the actual resolution and framerate of the current video capture. The property is updated at the start of every experiment run.	Status..	String
Control
Is Enabled	If set to false the element is completely omitted when the experiment is run	Design Time..	Boolean
Title	Title of the element	Design Time..	String

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Description ¶

Snapshots ¶

Web camera capture on the EventIDE status screen

Practical Use ¶

Technique 1 ¶

1. Add new Webcam element to any event in your experiment
2. Click on the Webcam element and select a video device from the device list in the property grid
3. Add a proxy variable to the Video Output property of the Webcam element
4. Create a XAML ContentControl on the status screen and set its binding to the VideoOutput proxy variable:
   

 // you can place the content control inside of any parent container
<ContentControl Width="640" Height="480" Content='{Binding VideoOutput}'/>

1. Make sure that camera working and run an experiment. The video output will be rendered scaled to the area of the Content Control on the Status Screen
   

Notes ¶

• You can not share the video device among multiple Webcam elements. However, you may use multiple cameras assigned to different Webcam elements.
• Be careful in using the Webcam element in experiments that require accurate timing. Video capture is hardware-accelerated on modern computers but a high processor load still can be induced, which, in turn, may potentially disrupt timing in an experiment. We suggest to always double check timing accuracy while the Webcam element is engaged. Alternatively, you may select the lowest settings for the resolution and framerate capture on a video device.
• If you have the Webcam element, whose Video Output is not bound to the status Screen, there is no performance costs for rendering. However, video capturing is running in the background, when the Webcam element exists in an experiment.