DFTInv
Applies an inverse DFT to complex source data and stores results in a destination image.
Syntax
Case
1
: Not-in-place operation on floating-point dataIppStatus ippiDFTInv_PackToR_<mod>(const Ipp32f*
pSrc
, int
srcStep
, Ipp32f*
pDst
, int
dstStep
, const IppiDFTSpec_R_32f*
pDFTSpec
, Ipp8u*
pBuffer
);
Supported values for
mod
:32f_C1R |
32f_C3R |
32f_C4R |
32f_AC4R |
Case
2
: Not-in-place operation on complex dataIppStatus ippiDFTInv_CToC_32fc_C1R(const Ipp32fc*
pSrc
, int
srcStep
, Ipp32fc*
pDst
, int
dstStep
, const IppiDFTSpec_C_32fc*
pDFTSpec
, Ipp8u*
pBuffer
);
Case
3
: In-place operation on floating-point dataIppStatus ippiDFTInv_PackToR_<mod>(Ipp32f*
pSrcDst
, int
srcDstStep
, const IppiDFTSpec_R_32f*
pDFTSpec
, Ipp8u*
pBuffer
);
Supported values for
mod
:32f_C1IR |
32f_C3IR |
32f_C4IR |
32f_AC4IR |
Case 5: In-place operation on complex data
IppStatus ippiDFTInv_CToC_32fc_C1IR(Ipp32fc*
pSrcDst
, int
srcDstStep
, const IppiDFTSpec_C_32fc*
pDFTSpec
, Ipp8u*
pBuffer
);
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 ROI.
- srcStep
- Distance in bytes between starts of consecutive lines in the source image.
- pDst
- Pointer to the destination image ROI.
- dstStep
- Distance in bytes between starts of consecutive lines in the destination image.
- pSrcDst
- Pointer to the source and destination image ROI for the in-place operation.
- srcDstStep
- Distance in bytes between starts of consecutive lines in the source and destination image for the in-place operation.
- pDFTSpec
- Pointer to the previously initialized DFT context structure.
- pBuffer
- Pointer to the external work buffer.
Description
This function operates with ROI.
This function performs an inverse DFT on each channel of the input buffer
pSrc
(pSrcDst
for in-place flavors) and writes the restored image data into the corresponding channel of the output image buffer pDst
(pSrcDst
for in-place flavors). For function flavor
ippiDFTInv_PackToR,
the input buffer must contain data in RCPack2D format.Before using the inverse DFT functions, you need to compute the size of the work buffer by
ippiDFTGetSize
and initialize the context structure by the ippiDFTInit
function. The inverse DFT functions use the pDFTSpec
context structure to set the mode of calculations and retrieve support data.Return Values
- ippStsNoErr
- Indicates no error. Any other value indicates an error or a warning.
- ippStsNullPtrErr
- Indicates an error condition ifpSrc, pDst,orpDFTSpecpointer isNULL.
- ippStsStepErr
- Indicates an error condition ifsrcStepordstStepvalue is zero or negative.
- ippStsContextMatchErr
- Indicates an error condition if a pointer to an invalidpDFTSpecstructure is passed.
- ippStsMemAllocErr
- Indicates an error condition if memory allocation fails.