IMVAdvancedOpticalFlow

IMVAdvancedOpticalFlow Interface.

The IMVAdvancedOpticalFlow interface contains methods and properties to configure the MV AdvancedOpticalFlow filter.

Methods:

Header file: IMVAdvancedOpticalFlow.h
Interface definition language file: IMVAdvancedOpticalFlow.idl
Typelib: MVAdvancedOpticalFlow
Interface ID: IID_IMVAdvancedOpticalFlow

Property IMVAdvancedOpticalFlow::AutoReset

Declaration: Property Get/Put AutoReset As Boolean

Automatically starts a new feature detection after a specified number of processed frames (see NumOfFrames).

C Prototype:

HRESULT put_AutoReset(VARIANT_BOOL newVal);
HRESULT get_AutoReset(VARIANT_BOOL* pVal);

Property IMVAdvancedOpticalFlow::DrawColor

Declaration: Property Get/Put DrawColor As Long

Set color for drawing the direction arrow.

C Prototype:

HRESULT put_DrawColor(LONG newVal);
HRESULT get_DrawColor(LONG* pVal);

Property IMVAdvancedOpticalFlow::DrawOpticalFlow

Declaration: Property Get/Put DrawOpticalFlow As Boolean

Draw optical flow arrows onto video.

C Prototype:

HRESULT put_DrawOpticalFlow(VARIANT_BOOL newVal);
HRESULT get_DrawOpticalFlow(VARIANT_BOOL* pVal);

Property IMVAdvancedOpticalFlow::FeatureQuality

Declaration: Property Get/Put FeatureQuality As Double

Quality level for feature selection (0.01 to 100.0).

C Prototype:

HRESULT put_FeatureQuality(DOUBLE newVal);
HRESULT get_FeatureQuality(DOUBLE* pVal);

Method IMVAdvancedOpticalFlow::GetMotion

Declaration: Function GetMotion As Boolean

Get the motion detection flag.

Parameter:

VARIANT_BOOL *value

TRUE if motion is currently detected, FALSE otherwise.

C Prototype:

HRESULT GetMotion(VARIANT_BOOL* value);

Method IMVAdvancedOpticalFlow::GetMotionDirection

Declaration: Function GetMotionDirection As Double

Get the main direction of the motion.

Parameter:

DOUBLE *value

Direction of global motion in degrees (0 to 360).

C Prototype:

HRESULT GetMotionDirection(DOUBLE* value);

Method IMVAdvancedOpticalFlow::GetMotionMagnitude

Declaration: Function GetMotionMagnitude As Double

Get the main direction of the motion.

Parameter:

DOUBLE *value

Magnification of global motion.

C Prototype:

HRESULT GetMotionMagnitude(DOUBLE* value);

Property IMVAdvancedOpticalFlow::MinimalDistance

Declaration: Property Get/Put MinimalDistance As Long

Minimum distance between two feature points.

C Prototype:

HRESULT put_MinimalDistance(LONG newVal);
HRESULT get_MinimalDistance(LONG* pVal);

Property IMVAdvancedOpticalFlow::NumOfFrames

Declaration: Property Get/Put NumOfFrames As Long

Number of frames to be processed before a new set of features is selected (see AutoReset).

C Prototype:

HRESULT put_NumOfFrames(LONG newVal);
HRESULT get_NumOfFrames(LONG* pVal);

Method IMVAdvancedOpticalFlow::ResetFeatures

Declaration: Sub ResetFeatures

Force new feature point detection.

C Prototype:

HRESULT ResetFeatures();

Property IMVAdvancedOpticalFlow::Threshold

Declaration: Property Get/Put Threshold As Long

Feature point motion smaller than this threshold (in pixel) is ignored.

C Prototype:

HRESULT put_Threshold(LONG newVal);
HRESULT get_Threshold(LONG* pVal);

Method IMVAdvancedOpticalFlow::GetMotionXPosition

Declaration: Function GetMotionXPosition As Double

Get the average horizontal position of the motion.

Parameter:

INT *value

Average horizontal motion position (0 to Image Width).

C Prototype:

HRESULT GetMotionXPosition(INT* value);

Method IMVAdvancedOpticalFlow::GetMotionYPosition

Declaration: Function GetMotionYPosition As Double

Get the average vertical position of the motion.

Parameter:

INT *value

Average vertical motion position (0 to Image Height).

C Prototype:

HRESULT GetMotionYPosition(INT* value);