WTInv_D97_JPEG2K

Performs a tile-oriented inverse wavelet transform with irreversible filter.

Syntax

IppStatus ippiWTInv_D97_JPEG2K_16s_C1R(const Ipp16s* pSrc[4], int srcStep[4], Ipp16s* pDst, int dstStep, const IppiRect* pTileRect, Ipp8u* pBuffer);

IppStatus ippiWTInv_D97_JPEG2K_32s_C1R(const Ipp32s* pSrc[4], int srcStep[4], Ipp32s* pDst, int dstStep, const IppiRect* pTileRect, Ipp8u* pBuffer);

IppStatus ippiWTInv_D97_JPEG2K_16s_C1IR(Ipp16s* pSrcDstTile, int srcDstStep, const IppiRect* pTileRect, Ipp8u* pBuffer);

IppStatus ippiWTInv_D97_JPEG2K_32s_C1IR(Ipp32s* pSrcDstTile, int srcDstStep, const IppiRect* pTileRect, Ipp8u* pBuffer);

Parameters

pSrc	An array of pointers to the source subbands (in the order LxLy, LxHy, HxLy, HxHy).
srcStep	Array of distances in bytes between starts of consecutive lines in the the source subbands.
pDst	Pointer to the destination image.
dstStep	Distance in bytes between starts of consecutive lines in the the destination image.
pSrcDstTile	Pointer to the source and destination image for in-place operation.
srcDstStep	Distance in bytes between starts of consecutive lines in the source and destination image for in-place operation.
pTileRect	Pointer to the tile rectangle structure.
pBuffer	Pointer to the buffer.

Description

The function ippiWTInv_D97_JPEG2K is declared in the ippj.h file. This function performs an inverse discrete wavelet transformation using a subband reconstruction in accordance with [ISO15444], Annex F, Discrete Wavelet Transformation of Tile-Components. The function performs one-level reconstruction of the tile of the destination image pDst from the set of four two-dimensional subbands pSrc labelled as LxLy, LxHy, HxLy, HxHy. The subband LxLy is a downsampled version of the initial tile to which horizontal and vertical low-pass filters were applied. The subband LxHy is a downsampled version of the initial tile to which a horizontal low-pass and vertical high-pass filters were applied. The subband HxLy is a downsampled version of the initial tile to which horizontal high-pass and vertical low-pass filters were applied. The subband HxHy is a downsampled version of the initial tile to which horizontal and vertical high-pass filters were applied. The function uses the 9-7 irreversible filter.

For not-in-place flavors, the source subbands are placed separately in the array pDst. For in-place flavors, the source subbands are placed in the pSrcDstTile (see Figure “Subband Positions for in-place Operations”).

The size of the required external buffer should be determined by calling the ippiWTGetBufSize_D97_JPEG2K function prior to using the wavelet transform function.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error condition if any of the specified pointers is NULL.
ippStsSizeErr	Indicates an error condition if the width or height of ROI has zero or negative value.
ippStsStepErr	Indicates an error condition if any of the specified step values is zero or negative.