GetAffineQuad
Computes vertex coordinates of the quadrangle, to which
the source ROI rectangle is mapped by the affine transform.
Syntax
IppStatus ippiGetAffineQuad (IppiRect
srcRoi
, double
quad
[4][2], const double
coeffs
[2][3]
);
IppStatus ippiGetAffineQuad_L(IppiRectL
srcRoi
, double
quad
[4][2], const double
coeffs
[2][3]
);
Include Files
ippi.h
Flavors with the
_L
suffix: ippi_l.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 theIppiRecttype).
- quad
- Output array. Contains vertex coordinates of the quadrangle, to which the source ROI is mapped by the affine transform function.
- coeffs
- The given affine transform coefficients.
Description
This function operates with ROI (see ROI Processing in Geometric
Transforms).
This function is used as a support function for . It computes vertex coordinates of the
quadrangle, to which the source rectangular ROI is mapped by the affine transform
function using the given 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.
- ippStsCoeffErr
- Indicates an error condition if c00*c11- c01*c10= 0.
- ippStsSizeErr
- Indicates an error condition ifsrcRoihas a size field with zero or negative value.