public Bitmap PgmToBitmap(PgmImage pgmImage)
{
if (pgmImage != null && pgmImage.MagicNumber == "P2")
{
int width = pgmImage.Width;
int height = pgmImage.Height;
Bitmap result = new Bitmap(width, height);
using (Graphics gr = Graphics.FromImage(result))
{
for (int i = 0; i < pgmImage.Height; ++i)
{
for (int j = 0; j < pgmImage.Width; ++j)
{
int pixelColor = pgmImage.Data[i][j];
Color c = Color.FromArgb(pixelColor, pixelColor, pixelColor);
SolidBrush sb = new SolidBrush(c);
gr.FillRectangle(sb, j, i, 1, 1);
}
}
return(result);
}
}
return(null);
}
private void openToolStripMenuItem_Click(object sender, EventArgs e)
{
DialogResult dlgResult = openFileDialog1.ShowDialog();
if (dlgResult == DialogResult.OK)
{
try
{
pgmOriginalImage = new PgmImage(openFileDialog1.FileName);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
pictureBoxOriginalImage.Image = PgmToBitmap(pgmOriginalImage);
if (pictureBoxOriginalImage.Image != null)
{
inputFileName = openFileDialog1.FileName;
outputFileName = null;
pictureBoxHistogram.Visible = true;
pictureBoxHistogram.Image = null;
saveAsToolStripMenuItem.Enabled = true;
saveToolStripMenuItem.Enabled = true;
labelMagicNumber.Text = "Magic Number: " + pgmOriginalImage.MagicNumber;
labelWidth.Text = "Width: " + pgmOriginalImage.Width + " px";
labelHieght.Text = "Height: " + pgmOriginalImage.Height + " px";
labelMaxVal.Text = "Maximum Gray Value: " + pgmOriginalImage.MaxVal;
Cursor.Current = Cursors.WaitCursor;
pgmHistogramImage = CalculateHistogramOf(pgmOriginalImage);
pictureBoxHistogram.Image = PgmToBitmap(pgmHistogramImage);
checkBoxOriginalSize.Enabled = true;
Cursor.Current = Cursors.Default;
}
else
{
inputFileName = null;
outputFileName = null;
pictureBoxHistogram.Visible = false;
checkBoxOriginalSize.Enabled = false;
saveAsToolStripMenuItem.Enabled = false;
saveToolStripMenuItem.Enabled = false;
pictureBoxOriginalImage.Image = pictureBoxOriginalImage.ErrorImage;
labelMagicNumber.Text = "Magic Number:";
labelWidth.Text = "Width:";
labelHieght.Text = "Height:";
labelMaxVal.Text = "Maximum Gray Value:";
}
}
}
public PgmImage CalculateHistogramOf(PgmImage originalImage)
{
PgmImage result = null;
if (originalImage != null)
{
int[] histogramArr = new int[256];
int max = 0;
for (int i = 0; i < originalImage.Height; i++)
{
for (int j = 0; j < originalImage.Width; j++)
{
int curr = ++histogramArr[originalImage.Data[i][j]];
if (max < curr)
{
max = curr;
}
}
}
// скалираме масива, т.к понякога се получават много големи числа и изхвърля изключение
histogramArr = Scale(histogramArr, 0, 1024);
result = new PgmImage(histogramArr.Length, histogramArr.Max(), "P2", null, histogramArr.Max());
int ind = 0;
bool drawBar;
for (int i = 0; i < result.Width; i++)
{
drawBar = true;
for (int j = result.Height - 1; j >= 0; j--)
{
if (drawBar)
{
for (int k = 0; k < histogramArr[ind]; k++, j--)
{
result.Data[j][i] = 0;
}
ind++;
drawBar = false;
}
else
{
result.Data[j][i] = 155;
}
}
}
}
return(result);
}