MontiVision DirectShow SDK Documentation

AutoReset	Automatically starts a new feature detection after a specified number of processed frames (see NumOfFrames).
DrawColor	Set color for drawing the direction arrow.
DrawOpticalFlow	Draw optical flow arrows onto video.
FeatureQuality	Quality level for feature selection (0.01 to 100.0).
GetMotion	Get the motion detection flag.
GetMotionDirection	Get the main direction of the motion.
GetMotionMagnitude	Get the main direction of the motion.
MinimalDistance	Minimum distance between two feature points.
NumOfFrames	Number of frames to be processed before a new set of features is selected (see AutoReset).
ResetFeatures	New feature detection.
Threshold	Feature point motion smaller than this threshold (in pixel) are ignored.
GetMotionXPosition	Get the average horizontal position of the motion.
GetMotionYPosition	Get the average vertical position of the motion.

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);