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 is `NULL`.
ippStsSizeErr	Indicates an error when roiSize has a field with a zero or negative value.