public static GrayPixelHistogram[] getAllPossibleConfigurationsGrayPixels()
{
GrayPixelHistogram[] hst = new GrayPixelHistogram[_maxPixelValue];
for (int i = 0; i < _maxPixelValue; i++)
{
hst[i] = new GrayPixelHistogram();
}
for (int i = 0; i < _maxPixelValue; i++)
{
hst[i].Value = i;
hst[i].Count = 0;
}
return(hst);
}
/* 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);
}
}
