CvCalcOpticalFlowPyrLK Method (CvArr, CvArr, CvArr, CvArr, CvPoint2D32f, CvPoint2D32f, CvSize, Int32, SByte, Single, CvTermCriteria, LKFlowFlag) OpenCvSharp Class Library
Calculates optical flow for a sparse feature set using iterative Lucas-Kanade method in pyramids

Namespace:  OpenCvSharp
Assembly:  OpenCvSharp (in OpenCvSharp.dll) Version: 1.0.0.0 (1.0.0.0)
Syntax

public static void CalcOpticalFlowPyrLK(
	CvArr prev,
	CvArr curr,
	CvArr prevPyr,
	CvArr currPyr,
	CvPoint2D32f[] prevFeatures,
	out CvPoint2D32f[] currFeatures,
	CvSize winSize,
	int level,
	out sbyte[] status,
	out float[] trackError,
	CvTermCriteria criteria,
	LKFlowFlag flags
)

Parameters

prev
Type: OpenCvSharpCvArr
First frame, at time t.
curr
Type: OpenCvSharpCvArr
Second frame, at time t + dt .
prevPyr
Type: OpenCvSharpCvArr
Buffer for the pyramid for the first frame. If the pointer is not null , the buffer must have a sufficient size to store the pyramid from level 1 to level #level ; the total size of (image_width+8)*image_height/3 bytes is sufficient.
currPyr
Type: OpenCvSharpCvArr
Similar to prev_pyr, used for the second frame.
prevFeatures
Type: OpenCvSharpCvPoint2D32f
Array of points for which the flow needs to be found.
currFeatures
Type: OpenCvSharpCvPoint2D32f
Array of 2D points containing calculated new positions of input features in the second image.
winSize
Type: OpenCvSharpCvSize
Size of the search window of each pyramid level.
level
Type: SystemInt32
Maximal pyramid level number. If 0 , pyramids are not used (single level), if 1 , two levels are used, etc.
status
Type: SystemSByte
Array. Every element of the array is set to 1 if the flow for the corresponding feature has been found, 0 otherwise.
trackError
Type: SystemSingle
Array of double numbers containing difference between patches around the original and moved points. Optional parameter; can be NULL .
criteria
Type: OpenCvSharpCvTermCriteria
Specifies when the iteration process of finding the flow for each point on each pyramid level should be stopped.
flags
Type: OpenCvSharpLKFlowFlag
Miscellaneous flags
See Also

Reference