/* private void Otsu_Click(object sender, EventArgs e)
* {
* var histogram = getGrayHistogramFromImage(_sampleImage);
*
* }*/
public static GrayPixelHistogram[] getGrayHistogramFromImage(Image image)
{
int matrixSize = image.Height * image.Width;
int j = 0;
using (Bitmap bmp = new Bitmap(image))
{
Color originalColor;
GrayPixelHistogram[] pixels = new GrayPixelHistogram[matrixSize];
GrayPixelHistogram[] allHstValues = new GrayPixelHistogram[_maxPixelValue];
GrayPixelHistogram[] sortedPixels = new GrayPixelHistogram[_maxPixelValue];
for (int i = 0; i < matrixSize; i++)
{
pixels[i] = new GrayPixelHistogram();
_originalPixels[i] = new GrayPixel();
}
for (int i = 0; i < _maxPixelValue; i++)
{
allHstValues[i] = new GrayPixelHistogram();
sortedPixels[i] = new GrayPixelHistogram();
}
for (int x = 0; x < image.Width; x++)
{
for (int y = 0; y < image.Height; y++)
{
originalColor = bmp.GetPixel(x, y);
//create the grayscale version of the pixel
pixels[j].Value = (int)((originalColor.R * .3) + (originalColor.G * .59) + (originalColor.B * .11));
_originalPixels[j].value = pixels[j].Value;
_originalPixels[j].R = originalColor.R;
_originalPixels[j].G = originalColor.G;
_originalPixels[j].B = originalColor.B;
_originalPixels[j].x = x;
_originalPixels[j].y = y;
j++;
}
}
var listOfUniqueVectors = pixels.GroupBy(l => l.Value).Select(g => new
{
Value = g.Key,
Count = g.Select(l => l.Value).Count()
});
var sortedList = listOfUniqueVectors.OrderBy(r => r.Value);
allHstValues = getAllPossibleConfigurationsGrayPixels();
//int _counter = 0;
//foreach (var item in sortedList)
//{
// sortedPixels[_counter].Value = item.Value;
// sortedPixels[_counter].Count = item.Count;
// _counter++;
//}
//rewrite vectors into empty matrix
for (int i = 0; i < _maxPixelValue; i++)
{
foreach (var item in sortedList)
{
if (item.Value == allHstValues[i].Value)
{
allHstValues[i].Value = Convert.ToInt32(item.Value);
allHstValues[i].Count = item.Count;
}
}
}
return(allHstValues);
}
}
public Image Bernsen(Image sourceImage, int windowSize, int eps)
{
int matrixSize = sourceImage.Height * sourceImage.Width;
Image im = sourceImage;
Bitmap myBitmap = new Bitmap(sourceImage.Width, sourceImage.Height);
try
{
if (windowSize % 2 != 0)
{
//odczyt obrazu
using (Bitmap bmp = new Bitmap(sourceImage))
{
Color originalColor;
Color framePixelColor;
GrayPixel[] _pixels = new GrayPixel[matrixSize];
GrayPixel _framePixelTemp = new GrayPixel();
GrayPixel[] _framePixels = new GrayPixel[(windowSize - 1) * (windowSize - 1)];
int j = 0;
int counter = 0;
int distance = Convert.ToInt32((windowSize - 1) * 0.5);
int _maxTempValue = 0;
int _minTempValue = 0;
for (int i = 0; i < matrixSize; i++)
{
_pixels[i] = new GrayPixel();
}
for (int i = 0; i < (windowSize - 1) * (windowSize - 1); i++)
{
_framePixels[i] = new GrayPixel();
}
#region
for (int x = 0; x < sourceImage.Width; x++)
{
for (int y = 0; y < sourceImage.Height; y++)
{
originalColor = bmp.GetPixel(x, y);
//create the grayscale version of the pixel
_pixels[j].value = (int)((originalColor.R * .3) + (originalColor.G * .59) + (originalColor.B * .11));
_pixels[j].R = originalColor.R;
_pixels[j].G = originalColor.G;
_pixels[j].B = originalColor.B;
_pixels[j].x = x;
_pixels[j].y = y;
//tworzymy liste o wielkosci okna naokolo pixela
if (x >= distance && x < sourceImage.Width - distance)
{
if (y >= distance && y < sourceImage.Height - distance)
{
;
//_framePixels.Clear();
counter = 0;
//i,k - obramowanie okna po ktorym sie poruszam naokolo danego pixela
//pobieram pixele naokolo pixela i licze prog za pomoca ich wartosci
for (int i = x - distance; i < x + distance; i++)
{
for (int k = y - distance; k < y + distance; k++)
{
;
//pobieram wartosci dla kazdego pixela z okna i odrazu licze prog lokalny dla obecnego pixela(centralnego z okna)
framePixelColor = bmp.GetPixel(i, k);
_framePixels[counter].value = (int)((framePixelColor.R * .3) + (framePixelColor.G * .59) + (framePixelColor.B * .11));
_framePixels[counter].x = i;
_framePixels[counter].y = k;
//lista pixeli w oknie - zle dodaje do listy? WTF - do poprawy
//_framePixels.Add(_framePixelTemp);
counter++;
}
}
//obliczenia na kazdym pixelu w liscie w danej chwili by obliczyc prog dla pixela na pozycji globalnej x,y
_maxTempValue = _framePixels.Max(max => max.value); //max
// min
_minTempValue = _framePixels.Min(min => min.value);
// oblicz prog dla danego globalnego pixela
if (_maxTempValue - _minTempValue <= eps)
{
_pixels[j].threshold = 121;//Convert.ToInt32((_maxTempValue + _minTempValue) * 0.5);
}
else
{
_pixels[j].threshold = Convert.ToInt32((_maxTempValue + _minTempValue) * 0.5);
}
}
}
else
{
//tu trafiaja przypadki, kiedy pixel jest za blisko brzegu obrazka - nie ruszac pixeli i wziac je z oryginalnego obrazka
}
j++;
}
}
#endregion
j = 0;
for (int Xcount = 0; Xcount < myBitmap.Width; Xcount++)
{
for (int Ycount = 0; Ycount < myBitmap.Height; Ycount++)
{
if (Xcount >= windowSize && Ycount >= windowSize && Xcount <= myBitmap.Width - windowSize && Ycount <= myBitmap.Height - windowSize)
{
if (_pixels[j].value > _pixels[j].threshold)
{
myBitmap.SetPixel(Xcount, Ycount, Color.White);
}
else if (_pixels[j].value <= _pixels[j].threshold)
{
myBitmap.SetPixel(Xcount, Ycount, Color.Black);
}
}
else
{
myBitmap.SetPixel(Xcount, Ycount, Color.FromArgb(_pixels[j].R, _pixels[j].G, _pixels[j].B));
}
j++;
}
}
im = myBitmap;
}
}
else
{
return(im);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
return(im);
}