public EffectiveBitmap ProcessHaar(EffectiveBitmap image, bool isRevert, int layers)
{
var haarColors = new HaarColor[image.Height, image.Width];
for (int i = 0; i < image.Height; i++)
{
for (int j = 0; j < image.Width; j++)
{
var color = image.GetPixel(i, j);
var haarColor = new HaarColor(color);
haarColors[j, i] = haarColor;
}
}
if (!isRevert)
{
FWT(haarColors, layers);
}
else
{
IWT(haarColors, layers);
}
var haarBitmap = EffectiveBitmap.Create(image.Width, image.Height, image.Depth, (i, j) =>
{
var haarColor = haarColors[j, i];
return(haarColor.GetPixelInfo());
});
return(haarBitmap);
}
public void IWT(HaarColor[] data)
{
var temp = new HaarColor[data.Length];
int h = data.Length / 2;
for (int i = 0; i < h; i++)
{
int k = (i * 2);
temp[k] =
new HaarColor(
(data[i].r * s0 + data[i + h].r * w0) / w0,
(data[i].g * s0 + data[i + h].g * w0) / w0,
(data[i].b * s0 + data[i + h].b * w0) / w0
);
temp[k + 1] =
new HaarColor(
(data[i].r * s0 + data[i + h].r * w1) / s0,
(data[i].g * s0 + data[i + h].g * w1) / s0,
(data[i].b * s0 + data[i + h].b * w1) / s0
);
}
for (int i = 0; i < data.Length; i++)
{
data[i] = temp[i];
}
}
private void FWT(HaarColor[] data)
{
HaarColor[] temp = new HaarColor[data.Length];
int h = data.Length / 2;
for (int i = 0; i < h; i++)
{
int k = (i * 2);
temp[i] =
new HaarColor(
data[k].r * s0 + data[k + 1].r * s1,
data[k].g * s0 + data[k + 1].g * s1,
data[k].b * s0 + data[k + 1].b * s1
);
temp[i + h] =
new HaarColor(
data[k].r * w0 + data[k + 1].r * w1,
data[k].g * w0 + data[k + 1].g * w1,
data[k].b * w0 + data[k + 1].b * w1
);
}
for (int i = 0; i < data.Length; i++)
{
data[i] = temp[i];
}
}
public void IWT(HaarColor[,] data, int iterations)
{
int rows = data.GetLength(0);
int cols = data.GetLength(1);
HaarColor[] col;
HaarColor[] row;
for (int k = iterations - 1; k >= 0; k--)
{
int lev = (int)Math.Pow(2, k);
int levCols = cols / lev;
int levRows = rows / lev;
col = new HaarColor[levRows];
for (int j = 0; j < levCols; j++)
{
for (int i = 0; i < col.Length; i++)
{
int x = j;
if (k == 1)
{
x += 400;
}
col[i] = data[i, x];
}
IWT(col);
for (int i = 0; i < col.Length; i++)
{
int x = j;
if (k == 1)
{
x += 400;
}
data[i, x] = col[i];
}
}
row = new HaarColor[levCols];
for (int i = 0; i < levRows; i++)
{
for (int j = 0; j < row.Length; j++)
{
int x = j;
if (k == 1)
{
x += 400;
}
row[j] = data[i, x];
}
IWT(row);
for (int j = 0; j < row.Length; j++)
{
int x = j;
if (k == 1)
{
x += 400;
}
data[i, x] = row[j];
}
}
}
}
