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Page Revision: 2014/07/22 06:07

The element allows monitoring the output of any video capturing device, e.g. webcam, on the status screen in EventIDE.

Table of Contents [Hide/Show] Description Snapshots Practical Use     Technique 1 Element actions aligned with different epochs of the parent event Notes Properties     Generic Properties

Description ¶

Short description

Snapshots ¶

Snapshot 1

Snapshot 2

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
   

Element actions aligned with different epochs of the parent event ¶

Epoche	Actions
Initialized	The selected camera starts capturing video
Rendered
Activating
Activated
Running	The camera output is rendered via the Video Output property, if it is bound to the status screen
Deactivated
Deinitialized	The selected camera stops capturing video

Notes ¶

Insert Notes here..

Properties ¶

Generic Properties ¶

Name	Description	Attributes	Value Type	Proxy Reflex
Category Name
Fill it	Fill it	Fill it	Fill it	Fill it

+=== Properties inherited from clVisualElement ===

Name	Description	Constraints	Value Type	Upon Runtime Change
VISUAL APPEARANCE
Alpha Masking	Defines whether the visual content rendered by this element will be used as an opacity mask which is applied onto the given event surface. The active opacity mask allows one to expose pixels of the parent event surface through a solid background of the given event. If the value is true, the darker pixels of the content will make more transparent holes on the entire event surface.	Design Time..	Boolean
AntiAliasing	If true, the rendered content will be anti-aliased for smoother visual appearance. If false, rendering will be authentic to its source, e.g. a bitmap.		Boolean	Visual Update..
Position	Defines the position of the element viewport on the screen. The position can be set in any of three coordinate systems: a) pixels, b) polar, c) central.		clPoint	Visual Update..
Size	Defines the size of the element viewport on the screen. The size can be set in any of three coordinate systems: a) pixels, b) visual degrees, c) 'relative-to-screen' size.		clSize	Visual Update..
Z Order	Indicates the current depth order of the element viewport on the surface of the parent event. The greatest number corresponds to the top position. The order can be changed by moving the element up and down in the element list.	Status..	Int32
Pivot Point	Defines the pivot point (coordinate and the rotation centers) within the element viewport.		stAlignment or Int32	Visual Update..
Visible	Defines whether the element is currently visible on the event surface. The property is convenient for switching visual content on and off.		Boolean	Visual Update..
Rotation	Defines the rotation angle (in degrees) of element viewport relative to the its pivot point.		Double in the range 0..360	Visual Update..
EFFECTS
Transparent Color	The color of the original pixels of rendered content that will be set as transparent.		stColor	Visual Update..
Transparency Tolerance	Tolerance ratio for choosing colors that become transparent. Zero means that effect is not applied, 1 denotes that all colors will become trasparent.		Int32, range (0..100)	Visual Update..
Color Mask	Produces a multiplicative combination of the original pixels and the selected mask color (except the alpha channel). The effect emulates a look through a colored glass. White or transparent mask color doesn't change the original pixels.		stColor	Visual Update..
Opacity	Opacity of the rendered content.		Int32, range (0..100)	Visual Update..
Contrast	Contrast of the rendered content.		Int32, range (-100..100)	Visual Update..
Brightness	Defines the brighness of the rendered content.		Int32, range (-100..100)	Visual Update..
Saturation	Saturation of the rendered content.		Double	Visual Update..
Pixelation	Defines the pixel scale of the rendering.		Int32, range (0..100)	Visual Update..
Blurring	The radius used in the gaussian blur of rendered content, as a pixel-based factor. The default is 0 which means no blurring.		Int32	Visual Update..
POSITIONAL JITTER
Reset Jitter	Set to true at runtime to reset the current positional jitter.	Runtime Command..	Boolean, set true for action	Visual Update..
Current Jitter	Jitter range, in pixels (non inclusive).	.	clSize	Visual Update..
Jitter Range	Jitter range, centered at the original position of the element.	.	clSize	Visual Update..

+=== Properties inherited from clLibraryElement ===

Name	Description	Constraints	Value Type	Upon Runtime Change
Material List
Selected Index	Defines the index of the active item in the material list of the element.		Int32	A change causes the current item to be reloaded and an update of the element.
Selected Item	Defines the name of the active item in the material list of the element. The name matches to a name of item in the Material Library		String	A change causes the current item to be reloaded and an update of the element.
Item Count	Returns the total number of items in the material list of the element.	Status..	Int32
Equalize RGB	The property is only available in the visual element. If the value is true, the average RGB pixel intensity will be equalized across all items in the material list. You can turn on this property, when you need to obtain a luminance-balanced set of visual stimulus.	Design Time..	Boolean

+=== Properties inherited from clSerialPortElement === Inherited properties of clSerialPort

Name	Description	Constraints	Value Type	Upon Runtime Change
Settings
Working Mode	Defines a working mode for the element. Select 'Auto Output' mode for sending data synchronously with an onset of the parent event, 'Input Detection' mode for catching the particular pattern in port input and 'Manual Output'/'Input Listener' modes for custom writing/reading scenarios controlled via snippets.	Design Time..	Struct,Int32
Encoding	The encoding method that is used to convert raw port bytes into text strings and vice verse. The default encoding is ByteChar which converts each byte of data to a single char.	Design Time..	Struct,Int32
Buffer Size	Size of the input circular buffer (in bytes) that stores all incoming port data, when the element works in the 'Input Listener' mode. If the buffer is small, a part of the data can be lost before it is read by the program.	Design Time..	Int32
Output
Test Output	Initiates a single output transfer through the port by sending the current content of the Output Buffer property	Designtime Command..
Output Buffer	Text buffer that accumulates data meant to be sent through the port.		String
Send Now	Runtime action that initiates an instant transfer of the current output value through the port. Manual runtime calls of this action are required if the element works in the Manual Output mode.	Runtime Command..	Boolean	Assigning "true" to the linked Proxy in snippets initiates a single action call
Input
Test Input	Start a dialog window that monitors arriving port input in realtime. Useп for verification of the selected port settings and encoding method.	Designtime Command..
Input	Returns the most recent content of the circular input buffer, when the element works in the Input Listener. The property is refreshed automatically on each OnRunning cycle, therefore, a property value should be read in the Running snippet.	Status..	String
Triggering Input	When the element works in the 'Input Detection' mode, the value of this property defines the 'catching' input string. If such string is detected an incoming input at some moment, the element registers the detection time and becomes triggered. This property is essential for time-accurate registration of the specific input, e.g button press, coming out of a external device.	Normal..	String
Trigger Once	Defines whether the element can be triggered multiple times, while the parent event is active. If the property value is 'true', only the first triggering is registered. Triggering can occur only in the 'Input Detection' working mode	Design Time..	Boolean
Runtime Status
Is Input Lost	Indicates that a part of the input has been lost due to large amount of incoming data at runtime or due to an insufficient size of the input buffer. Try to increase the buffer size or reduce a processing load when the element is active.	Status..	Boolean
Is Triggered	Indicates whether the element has been triggered at least once, since activation of the parent event. Triggering can occur only in the 'Input Detection' working mode	Status..	Boolean
Trigger Time	Indicates the local event time of the last element triggering. Triggering can occur only in the 'Input Detection' working mode.	Status..	UInt64

+=== Properties inherited from clParallelPortElement === Inherited properties of clParallelPort

Name	Description	Constraints	Value Type	Upon Runtime Change
Port Settings
Working Mode	Defines a working mode for the element.Select the 'Output on event onset' mode for sending signals synchronously with an onset of the parent event,or 'Triggering on input' mode for catching the particular pattern in port input. For custom reading/writing scenarios use the 'Manual IO' mode, in which port communications can be controlled by your code.	Design Time..	Int32
Output
Test Output	Sends a test output signal through the port using the selected signal profile and the current Output Value.	Designtime Command..
Signal Profile	Defines the time-amplitude profile of the output signal. The 'Level Change', 'Pulse' and 'TTL' profiles are available. Last two can be used to send the EEG triggers.		Int32
Preface Duration	Defines the duration (ms) of the guarantied zero preface interval for the TTL or Pulse signals. Increase the preface duration marginally, if your recording hardware does not detect port signals. Note that a non-zero preface delays the onset of the actual signal.		Double
Pulse Duration	Duration of an output pulse in ms. The value is applied only, if the Pulse signal profile is selected.		UInt64
Output Value	Value to be sent through the port. Can be defined in integer or binary format, e.g. Output='01010000'; or Output=255;		clBinaryInteger
Send Now	Runtime command that that initiates an instant transfer of the current output value through the port. Manual command calls at runtime are only required, if the element works in the Manual I/O mode.	Runtime Command..	Boolean	Execute the command by assigning true in code: SendNow=true;
Input
Test Input	Open a input monitor window showing real-time port input with the current settings. Use it for testing at designtime.	Designtime Command..
Input Value	Returns the current state of the port input lines. The property is not updated automatically. Manual reading of the property value in snippets is required to obtain the current input. The value can be read either to the integer or binary formats, e.g. 'string S=Input;' may return '01010101'.	Status..	clBinaryInteger
Triggering Input	eturns the current state of the port input lines. The property is not updated automatically. Manual reading of the property value in snippets is required to obtain the current input. The value can be read either to the integer or binary formats, e.g. 'string S=Input;' may return '01010101'.		String
Trigger Once	Returns the current state of the port input lines. The property is not updated automatically. Manual reading of the property value in snippets is required to obtain the current input. The value can be read either to the integer or binary formats, e.g. 'string S=Input;' may return '01010101'	Design Time..	Boolean
Runtime Status
Is Triggered	Indicates whether the element has been triggered at least once, since activation of the parent event. Triggering occurs only in the 'Input Detection' working mode.	Status..	Boolean
Trigger Time	Indicates the local event time of the last element triggering. Triggering occurs only in the 'Input Detection' working mode.	Status..	UInt64

+=== Properties inherited from clTrackerElement ===

Name	Description	Constraints	Type	Upon Runtime Change
GLM Calibration
Run GLM Calibration	Runs the GLM calibration procedure, which calculates two pairs of linear coefficients for mapping of the tracker input into the screen coordinates. The calculated coefficients are automatically applied at runtime.	Designtime Command..	Boolean
Gain X	Defines the gain coefficient for the X axis in the GLM calibration model: X='GainX'*x+OffsetX		Double
Gain Y	Defines the gain coefficient for the Y axis in the GLM calibration model: Y=GainY*y+OffsetY		Double
Offset X	Defines the offset coefficient for the X axis in the GLM calibration model: X=GainX*x+OffsetX		Double
Offset Y	Defines the offset coefficient for the Y axis in the GLM calibration model: Y=GainY*y+OffsetY		Double
Drift Correction
Recalibrate Now	Runtime command that helps to correct drifts in tracking data.Correction is done by recalibration of the latest tracker position into a custom screen point defined by the 'Recalibration Point' property.nAs result, the offsets of the GLM calibration get adjusted (but not gains) to compensate a drift in further data.	Runtime Command..	Boolean
Recalibration Point	Defines the screen point to which the tracker position will be recalibrated on calling 'Recalibrate Now' action. The default auto value always denotes the screen center.	Normal..	clPoint
Logging
Log Folder	Opens the dialog for selecting a local folder that will hold all tracking logs	Designtime Command..	String
Open Log Designer	Opens a designer window where the log format can be defined.	Designtime Command..	Boolean
Is Logging	Defines whether logging is turn on/off. The value can be changed at any moment at runtime allowing selective logging during the relevant periods only.	Normal..	Boolean
User Field	Defines the custom user data that is added to every line in the log file. The property can be used for recording varying status information (e.g. trial number) together with the tracker data. The string value may contains multiple fields separated by delimiter.	Normal..	String	Once a string value is assigned, it is added to every new upcoming line in the log until a new assignment is made.

+=== Properties inherited from clElement === Inherited properties of clElement

Name	Description	Constraints	Value Type	Upon Change
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