Visible to Intel only — GUID: GUID-04BE2115-F022-4005-AFBE-7E22F7C6E331
Visible to Intel only — GUID: GUID-04BE2115-F022-4005-AFBE-7E22F7C6E331
WarpQuadLinearInit
Initializes the specification structure for warping an arbitrary quadrangle in the source image to the quadrangle in the destination image with the linear interpolation method.
Syntax
IppStatus ippiWarpQuadLinearInit(IppiSize srcSize, const double srcQuad[4][2], IppiSize dstSize, const double dstQuad[4][2], IppiWarpTransformType transform, IppDataType dataType, int numChannels, IppiBorderType borderType, const Ipp64f* pBorderValue, int smoothEdge, IppiWarpSpec* pSpec);
Include Files
ippi.h
Domain Dependencies
Headers: ippcore.h, ippvm.h, ipps.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib
Parameters
srcSize |
Size of the source image, in pixels. | ||||
srcQuad |
Quadrangle in the source image. | ||||
dstSize |
Size of the destination image, in pixels. | ||||
dstQuad |
Quadrangle in the destination image. | ||||
transform |
Type of the warp tranform. Supported values:
|
||||
dataType |
Data type of the source and destination images. Supported values: ipp8u, ipp16u, ipp16s, and ipp32f. | ||||
numChannels |
Number of channels in the image. Supported values: 1, 3, or 4. | ||||
borderType |
Type of border. Supported values:
|
||||
pBorderValue |
Pointer to the constant value to assign to pixels of the constant border. This parameter is applicable only to the ippBorderConst border type. |
||||
smoothEdge |
Flag for edge smoothing. Supported values:
|
||||
pSpec |
Pointer to the specification structure. |
Description
This function initializes the IppiWarpSpec structure for warping an arbitrary quadrangle in the source image to quadrangle in the destination image with the linear interpolation method. To compute the size of the specification structure, use the WarpQuadGetSize function.
Transformation coefficients are computed internally, based on the mapping of the source quadrangle to the specified destination quadrangle dstQuad and transform type transform. In case of affine transform, the function computes the coordinates of the fourth vertex of the destination quadrangle that uniquely depends on the three other vertices. If the computed coordinates are not equal to the corresponding values specified in dstQuad, the function returns the warning message and continues initialization with the computed values.
The first dimension [4] of the array specifying the quadrangle srcQuad[4][2] or dstQuad[4][2] is equal to the number of vertices, and the second dimension [2] contains the x and y coordinates of the vertex.
For an example on how to use this function, refer to the example provided with the WarpQuadNearestInit function description.
You can apply the edge smoothing feature only if the source quadrangle entirely lies in the source image.
Return Values
ippStsNoErr |
Indicates no error. |
ippStsNullPtrErr |
Indicates an error when:
|
ippStsSizeErr |
Indicates an error when width or height of the source or destination image is less than, or equal to one. |
ippStsDataTypeErr |
Indicates an error when dataType has an illegal value. |
ippStsWarpTransformErr |
Indicates an error when transform has an illegal value. |
ippStsQuadErr |
Indicates an error when any of the given quadrangles is non-convex or degenerates into a triangle, line, or point. |
ippStsWrongIntersectQuad |
Indicates a warning that no operation is performed if the transformed source image extended with borders has no intersection with the destination image. |
ippStsAffineQuadChanged |
Indicates a warning when coordinates of the fourth vertex of dstQuad are changed by the function, if transform is set to ippWarpAffine. |
ippStsBorderErr |
Indicates an error when borderType has an illegal value. |
ippStsNumChannelsErr |
Indicates an error when numChannels has an illegal value. |