private void contrast(int contrast)
{
Bitmap b = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
LockBitmap lockBitmap = new LockBitmap(b);
LockBitmap orig = new LockBitmap((Bitmap)original);
float factor = (259 * (contrast + 255)) / (255 * (259 - contrast));
lockBitmap.LockBits();
orig.LockBits();
for (int i = 0; i < pictureBox1.Image.Height; i++)
{
for (int j = 0; j < pictureBox1.Image.Width; j++)
{
var colour = orig.GetPixel(j, i);
float newRed = Truncate(factor * (colour.R - 128) + 128);
float newGreen = Truncate(factor * (colour.G - 128) + 128);
float newBlue = Truncate(factor * (colour.B - 128) + 128);
lockBitmap.SetPixel(j, i, Color.FromArgb((int)newRed, (int)newGreen, (int)newBlue));
}
}
lockBitmap.UnlockBits();
orig.UnlockBits();
pictureBox1.Image = b;
}
private void EdgeDetectionEvent(object sender, EventArgs e)
{
Bitmap bitmap = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
LockBitmap old = new LockBitmap((Bitmap)pictureBox1.Image);
LockBitmap n = new LockBitmap((Bitmap)bitmap);
old.LockBits();
n.LockBits();
for (int i = 1; i < pictureBox1.Image.Height; i++)
{
for (int j = 1; j < pictureBox1.Image.Width; j++)
{
var p1 = old.GetPixel(j, i);
var p2 = old.GetPixel(j, i - 1);
var p3 = old.GetPixel(j - 1, i);
var p4 = old.GetPixel(j - 1, i - 1);
int r = Math.Min(Math.Abs(p1.R - p2.R) + Math.Abs(p1.R - p3.R) + Math.Abs(p1.R - p4.R), 255);
int g = Math.Min(Math.Abs(p1.G - p2.G) + Math.Abs(p1.G - p3.G) + Math.Abs(p1.G - p4.G), 255);
int b = Math.Min(Math.Abs(p1.B - p2.B) + Math.Abs(p1.B - p3.B) + Math.Abs(p1.B - p4.B), 255);
n.SetPixel(j, i, Color.FromArgb(r, g, b));
}
}
old.UnlockBits();
n.UnlockBits();
pictureBox1.Image = bitmap;
grayImage = bitmap;
currentImageCp = new Bitmap(bitmap);
}
private void gaussianFilterTrackBar_ValueChanged(object sender, EventArgs e)
{
int param = gaussianFilterTrackBar.Value;
int[,] matrix = new int[, ] {
{ 1, 1, param, 1, 1 },
{ 1, param, param *param, param, 1 },
{ param, param *param, param *param *param, param *param, param },
{ 1, param, param *param, param, 1 },
{ 1, 1, param, 1, 1 },
};
int sum = 0;
for (int i = 0; i < 5; i++)
{
for (int j = 0; j < 5; j++)
{
sum += matrix[i, j];
}
}
Bitmap bitmap = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
LockBitmap n = new LockBitmap((Bitmap)bitmap);
LockBitmap orig = new LockBitmap((Bitmap)currentImageCp);
n.LockBits();
orig.LockBits();
for (int i = 2; i < pictureBox1.Image.Height - 2; i++)
{
for (int j = 2; j < pictureBox1.Image.Width - 2; j++)
{
var p = orig.GetPixel(j, i);
int r = 0, g = 0, b = 0;
for (int k = i - 2; k <= i + 2; k++)
{
for (int l = j - 2; l < j + 3; l++)
{
r += matrix[k - (i - 2), l - (j - 2)] * orig.GetPixel(l, k).R;
g += matrix[k - (i - 2), l - (j - 2)] * orig.GetPixel(l, k).G;
b += matrix[k - (i - 2), l - (j - 2)] * orig.GetPixel(l, k).B;
}
}
r /= sum;
g /= sum;
b /= sum;
n.SetPixel(j, i, Color.FromArgb(r, g, b));
}
}
orig.UnlockBits();
n.UnlockBits();
pictureBox1.Image = bitmap;
}
private void LaplacianClick(object sender, EventArgs e)
{
int param = gaussianFilterTrackBar.Value;
int[,] matrix = new int[, ] {
{ 0, -1, 0 },
{ -1, 4, 1 },
{ 0, -1, 0 }
};
Bitmap bitmap = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
LockBitmap n = new LockBitmap((Bitmap)bitmap);
LockBitmap orig = new LockBitmap((Bitmap)currentImageCp);
n.LockBits();
orig.LockBits();
for (int i = 1; i < pictureBox1.Image.Height - 1; i++)
{
for (int j = 1; j < pictureBox1.Image.Width - 1; j++)
{
var p = orig.GetPixel(j, i);
int r = 0, g = 0, b = 0;
for (int k = i - 1; k <= i + 1; k++)
{
for (int l = j - 1; l <= j + 1; l++)
{
r += matrix[k - (i - 1), l - (j - 1)] * orig.GetPixel(l, k).R;
g += matrix[k - (i - 1), l - (j - 1)] * orig.GetPixel(l, k).G;
b += matrix[k - (i - 1), l - (j - 1)] * orig.GetPixel(l, k).B;
}
}
r = (int)Truncate(r);
g = (int)Truncate(g);
b = (int)Truncate(b);
n.SetPixel(j, i, Color.FromArgb(r, g, b));
}
}
orig.UnlockBits();
n.UnlockBits();
pictureBox1.Image = bitmap;
}
private void button7_Click(object sender, EventArgs e)
{
Bitmap b = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
LockBitmap o = new LockBitmap((Bitmap)pictureBox1.Image);
o.LockBits();
int minR = 255;
int minG = 255;
int minB = 255;
int maxR = 0;
int maxG = 0;
int maxB = 0;
for (int i = 0; i < pictureBox1.Image.Height; i++)
{
for (int j = 0; j < pictureBox1.Image.Width; j++)
{
var p = o.GetPixel(j, i);
minR = Math.Min(minR, p.R);
minG = Math.Min(minG, p.G);
minB = Math.Min(minB, p.B);
maxR = Math.Max(maxR, p.R);
maxG = Math.Max(maxG, p.G);
maxB = Math.Max(maxB, p.B);
}
}
for (int i = 0; i < pictureBox1.Image.Height; i++)
{
for (int j = 0; j < pictureBox1.Image.Width; j++)
{
var p = o.GetPixel(j, i);
o.SetPixel(j, i, Color.FromArgb(255 * (p.R - minR) / (maxR - minR),
255 * (p.G - minG) / (maxG - minG),
255 * (p.B - minB) / (maxB - minB)));
}
}
o.UnlockBits();
pictureBox1.Refresh();
}
private void nonlinearNormalization_ValueChanged(object sender, EventArgs e)
{
//double alpha = Math.Log10(nonlinearNormalization.Value + 1.01);
double alpha = nonlinearNormalization.Value;
Bitmap b = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
LockBitmap n = new LockBitmap((Bitmap)b);
LockBitmap orig = new LockBitmap((Bitmap)original);
n.LockBits();
orig.LockBits();
double maxR = 0;
double maxG = 0;
double maxB = 0;
for (int i = 0; i < pictureBox1.Image.Height; i++)
{
for (int j = 0; j < pictureBox1.Image.Width; j++)
{
var p = orig.GetPixel(j, i);
maxR = Math.Max(maxR, p.R);
maxG = Math.Max(maxG, p.G);
maxB = Math.Max(maxB, p.B);
}
}
for (int i = 0; i < pictureBox1.Image.Height; i++)
{
for (int j = 0; j < pictureBox1.Image.Width; j++)
{
var p = orig.GetPixel(j, i);
n.SetPixel(j, i, Color.FromArgb((int)(255 * Math.Pow((p.R / maxR), alpha)),
(int)(255 * Math.Pow((p.G / maxG), alpha)),
(int)(255 * Math.Pow((p.B / maxB), alpha))));
}
}
orig.UnlockBits();
n.UnlockBits();
pictureBox1.Image = b;
}
private void lightening(int alpha)
{
Bitmap b = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
//LockBitmap bLock = new LockBitmap(b);
LockBitmap o = new LockBitmap((Bitmap)pictureBox1.Image);
o.LockBits();
//bLock.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);
o.SetPixel(j, i, Color.FromArgb(Math.Max(0, Math.Min(p.R + alpha, 255)),
Math.Max(0, Math.Min(p.G + alpha, 255)),
Math.Max(0, Math.Min(p.B + alpha, 255))));
}
}
//bLock.UnlockBits();
o.UnlockBits();
pictureBox1.Refresh();
}
private void greyClick(object sender, EventArgs e)
{
LockBitmap o = new LockBitmap((Bitmap)pictureBox1.Image);
Bitmap b = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
LockBitmap lockBitmap = new LockBitmap(b);
lockBitmap.LockBits();
o.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);
int color = (p.R + p.B + p.G) / 3;
lockBitmap.SetPixel(j, i, Color.FromArgb(color, color, color));
}
}
o.UnlockBits();
lockBitmap.UnlockBits();
pictureBox1.Image = b;
grayImage = new Bitmap(pictureBox1.Image);
}
private void TrashHolding(object sender, EventArgs e)
{
Bitmap b = new Bitmap(pictureBox1.Image.Width, pictureBox1.Image.Height);
LockBitmap lockBitmap = new LockBitmap(b);
LockBitmap orig = new LockBitmap((Bitmap)grayImage);
int label = trackBar2.Value;
lockBitmap.LockBits();
orig.LockBits();
for (int i = 0; i < pictureBox1.Image.Height; i++)
{
for (int j = 0; j < pictureBox1.Image.Width; j++)
{
var colour = orig.GetPixel(j, i);
int newcolor = colour.R >= label ? 255 : 0;
lockBitmap.SetPixel(j, i, Color.FromArgb(newcolor, newcolor, newcolor));
}
}
lockBitmap.UnlockBits();
orig.UnlockBits();
pictureBox1.Image = b;
currentImageCp = new Bitmap(b);
}
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;
}