DCTFwdInit, DCTInvInit
Initialize the context structure for the forward or
inverse DCT operation.
Syntax
IppStatus ippiDCTFwdInit_32f
(IppiDCTFwdSpec_32f*
pDCTSpec
, IppiSize
roiSize
, Ipp8u*
pMemInit
);
IppStatus ippiDCTInvInit_32f
(IppiDCTInvSpec_32f*
pDCTSpec
, IppiSize
roiSize
, Ipp8u*
pMemInit
);
Include Files
ippi.h
Domain Dependencies
Headers:
ippcore.h
, ippvm.h
, ipps.h
Libraries:
ippcore.lib
, ippvm.lib
, ipps.lib
Parameters
- pDCTSpec
- Pointer to the forward or inverse DCT context structure for initialization.
- roiSize
- Size of the source and destination ROI, in pixels.
- pMemInit
- Pointer to the temporary work buffer.
Description
These functions initialize the
pDCTSpec
context structure to
apply the forward or inverse DCT to two-dimensional image data. The ippiDCTFwd
and ippiDCTInv
functions use the pointer to the
initialized DCT context structure as an argument to compute the forward or inverse
DCT for points in the ROI of size roiSize
.Return Values
- ippStsNoErr
- Indicates no error.
- ippStsNullPtrErr
- Indicates an error when one of the specified pointers isNULL.
- ippStsSizeErr
- Indicates an error whenroiSizehas a field with a zero or negative value.