# CS 6810/7810: Wavelets and Wavelet Algorithms Assignment 7

Learning Objectives
1. 2D Ordered Inverse HWT
Introduction
This will be the last assignment on 2D HWT. You will implement the 2D Ordered Inverse HWT.
Problem
Extend your class TwoDHWT.java from Assignment 6 with the following static method that applies the 2D Ordered Inverse
HWT to the 2D Haar Wavelet Transform of some 2D signal sig_hwt. The second argument num_inv_iters speci es
the number of inverse iterations we will apply to sig_hwt. The third argument num_fwd_iter speci es the number of
forward iterations of the 2D Ordered HWT to the original signal. The four argument dbg_flag is the argument I use to
turn on or o various debugging messages.
TwoDHWT.ordInvDWTForNumIters(sig_hwt, num_inv_iters, num_fwd_iters, dbg_flag) {}
You can implement the following test method:
static void test_ordFwdInvHWT2(double[][] sig, int num_fwd_iters, int num_inv_iters, boolean dbg_flag) {
TwoDHWT.ordFwdDWTForNumIters(sig, num_fwd_iters, dbg_flag);
if ( dbg_flag ) {
System.out.println("================");
System.out.println("Forward HWT Transform");
display2DArray(sig, sig.length, sig[0].length);
}
TwoDHWT.ordInvDWTForNumIters(sig, num_inv_iters, num_fwd_iters, dbg_flag);
if ( dbg_flag ) {
System.out.println("Inverse HWT Transform");
display2DArray(sig, sig.length, sig[0].length);
}
}
Create the class WaveletAlgos_S17_HW07.java with several 2D signals, as de ned below. You can use these signals for
debugging your implementation of the 2D Ordered Inverse HWT. Note that the method TwoDHWT.ordFwdDWTForNumIters
has a third boolean argument set to false.
public class WaveletAlgos_S17_HW07 {
static double[][] signal_4x4 = {
{9,7,6,2},
{5,3,4,4},
{8,2,4,0},
{6,0,2,2}
};
1
static double[][] signal_8x8 = {
{8, 5, 4, 8, 6, 8, 10, 8},
{8, 10, 10, 4, 10, 4, 8, 2},
{6, 10, 2, 4, 2, 6, 1, 6},
{0, 8, 0, 10, 10, 6, 6, 10},
{8, 8, 8, 0, 4, 8, 6, 2},
{10, 6, 2, 2, 6, 6, 6, 8},
{2, 4, 10, 10, 10, 4, 6, 10},
{10, 6, 10, 6, 6, 4, 4, 4}
};
public static double[][] img_sample_16x16_01 = {
{255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255}
};
public static double[][] img_sample_16x16_02 = {
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
};
}
Let us run a few tests. Here is the rst test with its output right below it.
public static void main(String[] args) {
test_ordFwdInvHWT2(signal_4x4, 2, 1, true);
}
================
Forward HWT Transform
4.0 1.0 1.0 1.0
1.0 0.0 3.0 1.0
2.0 0.0 0.0 1.0
1.0 0.0 0.0 1.0
Inverse HWT Transform
6.0 1.0 4.0 1.0
2
2.0 0.0 0.0 1.0
4.0 3.0 2.0 1.0
1.0 0.0 0.0 1.0
Here is the second test with its output right below it.
public static void main(String[] args) {
test_ordFwdInvHWT2(signal_4x4, 2, 2, true);
}
================
Forward HWT Transform
4.0 1.0 1.0 1.0
1.0 0.0 3.0 1.0
2.0 0.0 0.0 1.0
1.0 0.0 0.0 1.0
Inverse HWT Transform
9.0 7.0 6.0 2.0
5.0 3.0 4.0 4.0
8.0 2.0 4.0 0.0
6.0 0.0 2.0 2.0
You can also test your implementation of the 2D Ordered Inverse HWT on the images from the previous assignment.
What To Submit