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.