Wavelet Toolbox

Example 1: Building a Wavelet Tree Object (WTREE)

This example creates a new class of objects: WTREE.

Starting from the class DTREE and overloading the methods split and merge, we define a wavelet tree class.

To plot a WTREE, the DTREE plot method is used.

You can have a look at a one-dimensional example in the ex1_wt M-file and at a two-dimensional example in the ex2_wt M-file located in the toolbox/wavelet/wavedemo directory. These examples 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 WTREE (parent class: DTREE)

Fields

dtree	Parent object
dwtMode	DWT extension mode
wavInfo	Structure (wavelet information)

Fields Description

wavInfo

Structure (wavelet information)

	wavName	- Wavelet Name
	Lo_D	- Low Decomposition filter
	Hi_D	- High Decomposition filter
	Lo_R	- Low Reconstruction filter
	Hi_R	- High Reconstruction filter

Methods

wtree	Constructor for the class WTREE.
merge	Merge (recompose) the data of a node.
split	Split (decompose) the data of a terminal node.

Advanced Use of Objects

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