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 theIppiRecttype).
- 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 ifsrcRoihas a size field with zero or negative value.
- ippStsCoeffErr
- Indicates an error condition if coefficient values are invalid.