private void btnBackward_Click(object sender, EventArgs e)
{
// Create inverse transform
WaveletTransform wt = new WaveletTransform(wavelet, true);
// Apply inverse transform
pictureBox.Image = wt.Apply(transformed);
}
private void btnForward_Click(object sender, EventArgs e)
{
if ((string)cbWavelet.SelectedItem == "Haar")
wavelet = new Haar((int)numIterations.Value);
else wavelet = new CDF97((int)numIterations.Value);
// Create forward transform
WaveletTransform wt = new WaveletTransform(wavelet);
// Apply forward transform
transformed = wt.Apply(lenna);
pictureBox.Image = transformed;
}
public void WaveletTransformConstructorTest()
{
// Start with a grayscale image
Bitmap src = Properties.Resources.lena512;
// Create a wavelet filter
IWavelet wavelet = new Accord.Math.Wavelets.Haar(2);
WaveletTransform target = new WaveletTransform(wavelet);
// Apply the transformation
Bitmap dst = target.Apply(src);
// Revert the transformation
target.Backward = true;
Bitmap org = target.Apply(dst);
double[,] actual = org.ToDoubleMatrix(0);
double[,] expected = src.ToDoubleMatrix(0);
Assert.IsTrue(actual.IsEqual(expected, 0.102));
}
public void Example1()
{
Bitmap image = Properties.Resources.lena512;
// Create a new Haar Wavelet transform filter
var wavelet = new WaveletTransform(new Haar(1));
// Apply the Wavelet transformation
Bitmap result = wavelet.Apply(image);
// Show on the screen
//ImageBox.Show(result);
Assert.IsNotNull(result);
// Extract only one of the resulting images
var crop = new Crop(new Rectangle(0, 0,
image.Width / 2, image.Height / 2));
Bitmap quarter = crop.Apply(result);
// Show on the screen
//ImageBox.Show(quarter);
Assert.IsNotNull(quarter);
}
/// <summary>
/// Applies wavelet transform filter (Accord.NET).
/// </summary>
/// <param name="img">Image.</param>
/// <param name="wavelet">A wavelet function.</param>
/// <param name="backward">True to perform backward transform, false otherwise.</param>
/// <returns>Transformed image.</returns>
public static Gray<byte>[,] WaveletTransform(this Gray<byte>[,] img, IWavelet wavelet, bool backward = false)
{
WaveletTransform wt = new WaveletTransform(wavelet, backward);
return img.ApplyFilter((BaseFilter)wt);
}
