Visible to Intel only — GUID: GUID-B13835ED-E329-4A61-8473-FB024F537234
Visible to Intel only — GUID: GUID-B13835ED-E329-4A61-8473-FB024F537234
WarpBilinearBack
MODIFIED API. Performs an inverse bilinear warping of the source image.
Syntax
IppStatus ippiWarpBilinearBack_<mod>(const Ipp<datatype>* pSrc, IppiSize srcSize, int srcStep, IppiRect srcRoi, Ipp<datatype>* pDst, int dstStep, IppiRect dstRoi, const double coeffs[2][4], int interpolation, Ipp8u* pBuffer);
Supported values for mod:
8u_C1R |
16u_C1R |
32f_C1R |
8u_C3R |
16u_C3R |
32f_C3R |
8u_C4R |
16u_C4R |
32f_C4R |
Include Files
ippi.h
Domain Dependencies
Headers: ippcore.h, ippvm.h, ipps.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib
Parameters
pSrc |
Pointer to the source image origin.An array of separate pointers to each plane in case of data in planar format. | ||||||
srcSize |
Size in pixels of the source image. | ||||||
srcStep |
Distance in bytes between starts of consecutive lines in the source image buffer. | ||||||
srcRoi |
Region of interest in the source image (of the IppiRect type). | ||||||
pDst |
Pointer to the destination image origin. An array of separate pointers to each plane in case of data in planar format. | ||||||
dstStep |
Distance in bytes between starts of consecutive lines in the destination image buffer. | ||||||
dstRoi |
Region of interest in the destination image (of the IppiRect type). | ||||||
coeffs |
The bilinear transform coefficients. | ||||||
interpolation |
Specifies the interpolation mode. Use one of the following values:
|
||||||
pBuffer |
Pointer to the external work buffer. |
Description
This function operates with ROI (see ROI Processing in Geometric Transforms).
This function performs the inverse transform to that defined by ippiWarpBilinear function. Pixel coordinates x' and y' in the transformed image are obtained from the following equations
c00* x'*y' + c01* x' + c02* y' + c03 = x
c10* x'*y' + c11* x' + c12* y' + c13 = y
where x and y denote the pixel coordinates in the source image, and coefficients cij are given in the array coeffs. Thus, you do not need to invert transform coefficients in your application program before calling ippiWarpBilinearBack.
Note that inverse transform functions handle source and destination ROI in a different way than other geometric transform functions. The implementation of the inverse transform functions has the following logic:
Backward transform is applied to coordinates of each pixel in the destination ROI. The result is coordinates of some pixel in the source image.
If the obtained source pixel is inside the source ROI, the corresponding pixel in the destination ROI is modified accordingly; otherwise, no changes are made.
Before using this function, compute the size of the external work buffer pBuffer using the WarpBilinearGetBufferSize function.
Example shows how to use the function ippiWarpBilinearBack_32f_C1R.
Return Values
ippStsNoErr |
Indicates no error. Any other value indicates an error or a warning. |
ippStsNullPtrErr |
Indicates an error condition if one of the specified pointers is NULL. |
ippStsSizeErr |
Indicates an error condition if any image dimension has zero or negative value. |
ippStsStepErr |
Indicates an error condition if srcStep or dstStep has a zero or negative value. |
ippStsInterpolationErr |
Indicates an error condition if interpolation has an illegal value. |
ippStsCoeffErr |
Indicates an error condition if coefficient values are invalid. |
ippStsWrongIntersectROIErr |
Indicates an error condition if srcRoi has no intersection with the source image. |
ippStsWrongIntersectQuad |
Indicates a warning that no operation is performed if the transformed source ROI has no intersection with the destination ROI. |