WTFwdRow_D97

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

Syntax

IppStatus ippiWTFwdRow_D97_JPEG2K_<mod>(const Ipp<datatype>* pSrc, int srcStep, Ipp<datatype>* pDstLow, int dstLowStep, Ipp<datatype>* pDstHigh, int dstHighStep, IppiSize dstRoiSize, IppiWTFilterFirst phase);

Supported values for mod:

16s_C1R

32s_C1R

32f_C1R

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 ippiWTFwdRow_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 rows 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 = 2 * dstRoiSize.width;

srcRoiSize.height = 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 on the left and 3 pixels on the right (outside ROI border) for each processed row;

if the phase argument is equal to ippWTFilterFirstHigh, the function requires 3 extra pixels on the left and 4 pixels on the right (outside ROI border) for each processed row.

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.