Wavelet Toolbox

Example 3: Building a Wavelet Tree Object (WVTREE)

This example creates a new class of objects: WVTREE.

We define a wavelet tree class starting from the class WTREE and overloading the methods get, plot, and recons (all inherited from DTREE).

The split and merge methods of the class WTREE are used.

The plot method shows how to add Node Labels and Node Actions.

You can have a look at a one-dimensional example in the ex1_wvt M-file and at a two-dimensional example in the ex2_wvt M-file located in the toolbox/wavelet/wavedemo directory. These programs can be used directly, but they are also useful to learn how to build new object-oriented programming functions.

The definition of the new class is described below.

Class WVTREE (parent class: WTREE)

Fields

dummy	Not used
wtree	Parent object

Methods

wvtree	Constructor for the class WVTREE.
get	Get WVTREE object field contents.
plot	Plot WVTREE object.
recons	Reconstruct node coefficients.

Running This Example

The following figure is obtained using the example ex2_wvt and clicking the node 2.

The approximations are labeled in yellow and the details are labeled in red. The last nodes cannot be split. The title of the figure contains the DWT extension mode used ('sym' in the present example).

Example 2: Building a Right Wavelet Tree Object (RWVTREE)

Example 4: Building a Wavelet Tree Object (EDWTTREE)

© 1994-2005 The MathWorks, Inc.