WTFwdCol_D97

Performs a forward wavelet transform with irreversible filter of image columns.

Syntax

IppStatus ippiWTFwdCol_D97_JPEG2K_32f_C1R(const Ipp32f* pSrc, int srcStep, Ipp32f* pDstLow, int dstLowStep, Ipp32f* pDstHigh, int dstHighStep, IppiSize dstRoiSize, IppiWTFilterFirst phase);

Parameters

pSrc	Pointer to the source image ROI.
srcStep	Distance in bytes between starts of consecutive lines in the source image.
pDstLow	Pointer to ROI of the low frequency component of a destination image.
dstLowStep	Distance in bytes between starts of consecutive lines in the low frequency component of a destination image.
pDstHigh	Pointer to ROI of the high frequency component of a destination image.
dstHighStep	Distance in bytes between starts of consecutive lines in the high frequency component of a destination image.
dstRoiSize	Size of the destination image ROI.
phase	Relative position of the high-pass and low-pass filters.

Description

The function ippiWTFwdCol_D97_JPEG2K is declared in the ippj.h file. It operates with ROI (see Regions of Interest in Intel IPP).

This function performs a wavelet decomposition of the source image columns using the 9-7 irreversible filter. Both destination ROIs have the same size dstRoiSize, while the source image ROI size is uniquely determined from the following relations:

srcRoiSize.width = dstRoiSize.width;

srcRoiSize.height = 2 * dstRoiSize.height.

For proper operation, the function needs valid data outside the source image ROI:

if the phase argument is equal to ippWTFilterFirstLow, the function requires 4 extra pixels up and 3 extra pixels down (outside ROI border) for each processed column;

if the phase argument is equal to ippWTFilterFirstHigh, the function requires 3 extra pixels up and 4 extra pixels down (outside ROI border) for each processed column.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error condition if at least one 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 buffer step values is zero or negative.