cvCalcOpticalFlowBM Method (prev, curr, blockSize, shiftSize, maxRange, usePrevious, velx, vely)

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Calculates optical flow for overlapped blocks block_size.width * block_size.height pixels each, thus the velocity fields are smaller than the original images. For every block in prev the functions tries to find a similar block in curr in some neighborhood of the original block or shifted by (velx(x0,y0),vely(x0,y0)) block as has been calculated by previous function call (if use_previous=1)

Declaration Syntax

Visual Basic

Visual C++

public static void cvCalcOpticalFlowBM(
	IntPtr prev,
	IntPtr curr,
	Size blockSize,
	Size shiftSize,
	Size maxRange,
	int usePrevious,
	IntPtr velx,
	IntPtr vely
)

Public Shared Sub cvCalcOpticalFlowBM ( _
	prev As IntPtr, _
	curr As IntPtr, _
	blockSize As Size, _
	shiftSize As Size, _
	maxRange As Size, _
	usePrevious As Integer, _
	velx As IntPtr, _
	vely As IntPtr _
)

public:
static void cvCalcOpticalFlowBM(
	IntPtr prev, 
	IntPtr curr, 
	Size blockSize, 
	Size shiftSize, 
	Size maxRange, 
	int usePrevious, 
	IntPtr velx, 
	IntPtr vely
)

Parameters

prev (IntPtr): First image, 8-bit, single-channel.

curr (IntPtr): Second image, 8-bit, single-channel.

blockSize (Size): Size of basic blocks that are compared.

shiftSize (Size): Block coordinate increments.

maxRange (Size): Size of the scanned neighborhood in pixels around block.

usePrevious (Int32): Uses previous (input) velocity field.

velx (IntPtr): Horizontal component of the optical flow of floor((prev->width - block_size.width)/shiftSize.width) x floor((prev->height - block_size.height)/shiftSize.height) size, 32-bit floating-point, single-channel.

vely (IntPtr): Vertical component of the optical flow of the same size velx, 32-bit floating-point, single-channel.

Assembly: Emgu.CV (Module: Emgu.CV) Version: 1.5.0.0 (1.5.0.0)