private void Equalization_Click(object sender, EventArgs e)
{
int[] R = new int[256];
int[] G = new int[256];
int[] B = new int[256];
Bitmap bitmap = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
LockBitmap n = new LockBitmap((Bitmap)bitmap);
LockBitmap o = new LockBitmap((Bitmap)pictureBox1.Image);
o.LockBits();
n.LockBits();
for (int i = 0; i < pictureBox1.Image.Height; i++)
{
for (int j = 0; j < pictureBox1.Image.Width; j++)
{
var p = o.GetPixel(j, i);
R[p.R]++;
G[p.G]++;
B[p.B]++;
}
}
int cdfRMin = 0;
int cdfGMin = 0;
int cdfBMin = 0;
for (int i = 1; i < 256; i++)
{
if (R[i - 1] > 0 && cdfRMin == 0)
{
cdfRMin = R[i - 1];
}
if (G[i - 1] > 0 && cdfGMin == 0)
{
cdfGMin = G[i - 1];
}
if (B[i - 1] > 0 && cdfBMin == 0)
{
cdfBMin = B[i - 1];
}
R[i] += R[i - 1];
G[i] += G[i - 1];
B[i] += B[i - 1];
}
int NxM = pictureBox1.Image.Height * pictureBox1.Image.Width;
for (int i = 0; i < pictureBox1.Image.Height; i++)
{
for (int j = 0; j < pictureBox1.Image.Width; j++)
{
var p = o.GetPixel(j, i);
int r = (int)(255 * (R[p.R] - cdfRMin) / (NxM - cdfRMin));
int g = (int)(255 * (G[p.G] - cdfGMin) / (NxM - cdfGMin));
int b = (int)(255 * (B[p.B] - cdfBMin) / (NxM - cdfBMin));
n.SetPixel(j, i, Color.FromArgb(r, g, b));
}
}
o.UnlockBits();
n.UnlockBits();
pictureBox1.Image = bitmap;
}