Developer Reference

  • 2021
  • 01/15/2021
  • Public Content
Contents

OpticalFlowPyrLKInit

Initializes the state structure for optical flow calculation.

Syntax

IppStatus ippiOpticalFlowPyrLKInit_<mod>(IppiOptFlowPyrLK_<mod>**
ppState
, IppiSize
roiSize
, int
winSize
, IppHintAlgorithm
hint
, Ipp8u*
pStateBuf
);
Supported values for
mod
:
8u_C1R
16u_C1R
32f_C1R
Include Files
ippcv.h
Domain Dependencies
Headers:
ippcore.h
,
ippvm.h
,
ipps.h
,
ippi.h
Libraries:
ippcore.lib
,
ippvm.lib
,
ipps.lib
,
ippi.lib
Parameters
ppState
Double pointer to the optical flow state structure to be initialized.
roiSize
Maximal size of the source image (zero level of the pyramid) ROI, in pixels.
winSize
Size of the search window of each pyramid level.
hint
Option to select the algorithmic implementation of the transform function.
pStateBuf
Pointer to the work buffer for the state structure.
Description
This function operates with ROI (see Regions of Interest in Intel IPP).
This function initializes the
ppState
structure that is required to calculate the optical flow between two images in the centered window of size
winSize
*
winSize
using the pyramidal Lucas-Kanade [Bou99] algorithm. The
hint
argument specifies the computation algorithm. The
ppState
structure is used by the
ippiOpticalFlowPyrLK
function and can be applied to process images with size not greater than
roiSize
.
Return Values
ippStsNoErr
Indicates no error. Any other value indicates an error or a warning.
ippStsNullPtrErr
Indicates an error when
ppState
is
NULL
.
ippStsSizeErr
Indicates an error when
roiSize
has a field with a zero or negative value; or when
winSize
is less than, or equal to zero.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.