Developer Reference

  • 2020
  • 07/15/2020
  • Public Content
Contents

GetBilinearQuad

Computes the vertex coordinates of the quadrangle, to which the source rectangular ROI is mapped by the bilinear transform.

Syntax

IppStatus ippiGetBilinearQuad(IppiRect
srcRoi
, double
quad
[4][2], const double
coeffs
[2][4]
);
Include Files
ippi.h
Domain Dependencies
Headers:
ippcore.h
,
ippvm.h
,
ipps.h
Libraries:
ippcore.lib
,
ippvm.lib
,
ipps.lib
Parameters
srcRoi
Region of interest in the source image (of the
IppiRect
type).
quad
Output array. Contains vertex coordinates of the quadrangle, to which the source ROI is mapped by the bilinear transform function.
coeffs
The given bilinear transform coefficients.
Description
This function operates with ROI (see ROI Processing in Geometric Transforms).
This function is used as a support function for
ippiWarpBilinear
. It computes vertex coordinates of the quadrangle, to which the source rectangular ROI is mapped by the bilinear transform function
ippiWarpBilinear
using coefficients
coeffs
.
The first dimension [4] of the array
quad
[4][2] is equal to the number of vertices, and the second dimension [2] means
x
and
y
coordinates of the vertex. Quadrangle vertices have the following meaning:
quad
[0] corresponds to the transformed top-left corner of the source ROI,
quad
[1] corresponds to the transformed top-right corner of the source ROI,
quad
[2] corresponds to the transformed bottom-right corner of the source ROI,
quad
[3] corresponds to the transformed bottom-left corner of the source ROI.
Return Values
ippStsNoErr
Indicates no error. Any other value indicates an error.
ippStsSizeErr
Indicates an error condition if
srcRoi
has a size field with zero or negative value.
ippStsCoeffErr
Indicates an error condition if coefficient values are invalid.

Product and Performance Information

1

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Notice revision #20110804