Calculates optical flow for a sparse feature set using iterative Lucas-Kanade method in pyramids

Namespace:  Emgu.CV
Assembly:  Emgu.CV (in Emgu.CV.dll) Version: 2.0.1.0 (2.0.1.0)

Syntax

C#
public static void PyrLK(
	Image<Gray, byte> prev,
	Image<Gray, byte> curr,
	PointF[] prevFeatures,
	Size winSize,
	int level,
	MCvTermCriteria criteria,
	out PointF[] currFeatures,
	out byte[] status,
	out float[] trackError
)
Visual Basic (Declaration)
Public Shared Sub PyrLK ( _
	prev As Image(Of Gray, Byte), _
	curr As Image(Of Gray, Byte), _
	prevFeatures As PointF(), _
	winSize As Size, _
	level As Integer, _
	criteria As MCvTermCriteria, _
	<OutAttribute> ByRef currFeatures As PointF(), _
	<OutAttribute> ByRef status As Byte(), _
	<OutAttribute> ByRef trackError As Single() _
)
Visual C++
public:
static void PyrLK(
	Image<Gray, unsigned char>^ prev, 
	Image<Gray, unsigned char>^ curr, 
	array<PointF>^ prevFeatures, 
	Size winSize, 
	int level, 
	MCvTermCriteria criteria, 
	[OutAttribute] array<PointF>^% currFeatures, 
	[OutAttribute] array<unsigned char>^% status, 
	[OutAttribute] array<float>^% trackError
)

Parameters

prev
Type: Emgu.CV..::.Image<(Of <(Gray, Byte>)>)
First frame, at time t
curr
Type: Emgu.CV..::.Image<(Of <(Gray, Byte>)>)
Second frame, at time t + dt
prevFeatures
Type: array< System.Drawing..::.PointF >[]()[]
Array of points for which the flow needs to be found
winSize
Type: System.Drawing..::.Size
Size of the search window of each pyramid level
level
Type: System..::.Int32
Maximal pyramid level number. If 0 , pyramids are not used (single level), if 1 , two levels are used, etc
criteria
Type: Emgu.CV.Structure..::.MCvTermCriteria
Specifies when the iteration process of finding the flow for each point on each pyramid level should be stopped
currFeatures
Type: array< System.Drawing..::.PointF >[]()[] %
Array of 2D points containing calculated new positions of input features in the second image
status
Type: array< System..::.Byte >[]()[] %
Array. Every element of the array is set to 1 if the flow for the corresponding feature has been found, 0 otherwise
trackError
Type: array< System..::.Single >[]()[] %
Array of double numbers containing difference between patches around the original and moved points

See Also