Include Files

Domain Dependencies

Headers:

ippcore.h

,

ippvm.h

,

ipps.h

Libraries:

ippcore.lib

,

ippvm.lib

,

ipps.lib

Description

This function initializes the specification structure

pSpec

for a one-level wavelet decomposition.

The forward wavelet transform specification structure contains parameters of a wavelet filter bank used for image decomposition. The filter bank consists of two analysis filters and includes the lowpass decomposition filter (or

coarse

filter) and the highpass decomposition filter (or

detail

filter).

The parameters

pTapsLow

and

pTapsHigh

specify coefficients, and

anchorLow

and

anchorHigh

- anchor positions for two synthesis filters. The anchor value sets the initial leftmost filter position relative to image row or column as shown in the figure below:

Here

a

stands for anchor value,

N

is filter length, x

0

is the starting pixel of the processed row or column, and x

-1

, x

-2

,... are the additional border pixels that are needed for calculations. The anchor value and filter length completely determine right, left, top, and bottom border sizes for the source image used in decomposition. The corresponding C-language expressions to calculate border sizes are given in the description of ippiWTFwd

function.

For an example on how to use this function, refer to the example provided with the

ippiWTInv

function description.