pgetsubband

Synopsis

Description

pgetsubband gets a subband from a DWT image at the specified scale. The output subband im_out is an image. At each scale, image are numbered as follows:

    [1][2]
    [3][4]

• 1: subband LL of approximate coefficients.
• 2: subband LH of detail coefficients.
• 3: subband HL of detail coefficients.
• 4: subband HH of detail coefficients.

Parameters

• scale specifies the scale analysis of the DWT image.
• subband specifies the number of the subband [1..4] to be extracted at the specified scale.

Inputs

• im_in: a 2D grayscale image.

Inputs

• im_out: an image of the same type as the input image.

Result

Returns SUCCESS or FAILURE.

Examples

Gets the LL and LH images of the DWT analysis of a square:

   pshapedesign 256 256 0 2 150 150 a.pan
   pqmf daubechies 4 b.pan
   pdwt 1 a.pan b.pan c.pan
   pgetsubband 1 1 c.pan out1.pan
   pgetsubband 1 2 c.pan out2.pan

See also

C++ prototype

Version française

Extraction d'une sous-bande d'une image de DWT.