public KMCPoint <int> GetMean(LockedBitmap FrameBuffer, List <KMCPoint <int> > Centroids)
{
// Declaring two variables to assign the value of the "mean" of
// the sets of coordinates (X;Y) of each super-pixel
double Mean_X = 0, Mean_Y = 0;
// Iterating through the array of super-pixels and for each
// super-pixel retrieve its X and Y coordinates and divide it
// by the overall amount of super-pixels. After that, sum up
// each value with the values of Mean_X and Mean_Y variables
for (Int32 Index = 0; Index < Centroids.Count(); Index++)
{
Mean_X += Centroids[Index].X / (double)Centroids.Count();
Mean_Y += Centroids[Index].Y / (double)Centroids.Count();
}
// Convert the values of Mean_X and Mean_Y to Int32 datatype
Int32 X = Convert.ToInt32(Mean_X);
Int32 Y = Convert.ToInt32(Mean_Y);
FrameBuffer.LockBits();
Color Clr = FrameBuffer.GetPixel(X, Y);
FrameBuffer.UnlockBits();
// Constructing KMCPoint<int> object and return its value
return(new KMCPoint <int>(X, Y, Clr));
}
public void Generate(ref List <KMCPoint <int> > Centroids, LockedBitmap ImageFrame, Int32 Distance, Int32 Offset)
{
// Compute the number of iterations performed by the main loop equal to image W * H
// The following value is the maximum possible number of random super-pixel being generated
Int32 Size = ImageFrame.Width * ImageFrame.Height;
ImageFrame.LockBits();
// Performing Size - iterations of the following loop to generate a specific amount of super-pixels
for (Int32 IterCount = 0; IterCount < Size; IterCount++)
{
// Obtain a random value of X - coordinate of the current super-pixel
Int32 Rand_X = rand.Next(0, ImageFrame.Width);
// Obtain a random value of Y - coordinate of the current super-pixel
Int32 Rand_Y = rand.Next(0, ImageFrame.Height);
// Create and instantinate a point object by using the values of
// Rand_X, Rand_Y and Colorref parameters. The value of colorref is
// retrieved by using the GetPixel method for the current bitmap object
KMCPoint <int> RandPoint = new KMCPoint <int>(Rand_X,
Rand_Y, ImageFrame.GetPixel(Rand_X, Rand_Y));
// Performing a validity check if none of those super-pixel previously
// selected don't exceed the distance and color offset boundary to the
// currently generated super-pixel with coordinates Rand_X and Rand_Y and
// specific color stored as a parameter value of Clr variable
if (!this.IsValidColor(Centroids, RandPoint, Offset) &&
!this.IsValidDistance(Centroids, RandPoint, Distance))
{
// If not, check if the super-pixel with the following coordinates and color
// already exists in the array of centroid super-pixels being generated.
if (!Centroids.Contains(RandPoint))
{
// If not, append the object RandPoint to the array of super-pixel objects
Centroids.Add(RandPoint);
}
}
}
ImageFrame.UnlockBits();
}
public Bitmap Compute(Bitmap InputFile)
{
// Initialize the code execution timer
var watch = System.Diagnostics.Stopwatch.StartNew();
// Initialize the directory info reference object
DirectoryInfo dir_info = new DirectoryInfo("Clusters");
// Check if the directory with name "Clusters" is created.
// If not, create the directory with name "Clusters"
if (dir_info.Exists == false)
{
dir_info.Create();
}
// Initialize the array of clusters by generating an initial cluster
// containing the original source image associated with the array of super-pixels
m_Clusters.Init((Bitmap)InputFile.Clone(), m_Distance, m_OffsetClr);
// Initialize the bitmap object used to store the resulting segmented image
LockedBitmap ResultBitmap = new LockedBitmap(m_Clusters[0].Frame.Width, m_Clusters[0].Frame.Height);
Int32 FrameIndex = 0;
// Iterate throught the array of clusters until we've process all clusters being generated
for (Int32 Index = 0; Index < m_Clusters.Count(); Index++)
{
// For each particular cluster from the array, obtain the values of bitmap object and
// the List<KMCPoint<int>> object which is the array of centroid super-pixels
List <KMCPoint <int> > Centroids = m_Clusters[Index].Centroids.ToList();
LockedBitmap FrameBuffer = new LockedBitmap(m_Clusters[Index].Frame.m_Bitmap);
// Save the image containg the segmented area associated with the current cluster to the
// specific file, which name has the following format, for example "D:\Clusters\Cluster_N.jpg"
FrameBuffer.Save("Clusters\\Cluster_" + FrameIndex + ".jpg");
FrameBuffer.LockBits();
// Iterating through the array of centroid super pixels and for each super-pixels
// perform a linear search to find all those pixel in the current image which distance
// does not exceed the value of specific boundary parameter.
for (Int32 Cnt = 0; Cnt < Centroids.Count(); Cnt++)
{
// Obtain the value of Width and Height of the image for the current cluster
Int32 Width = FrameBuffer.Width;
Int32 Height = FrameBuffer.Height;
// Create a bitmap object to store an image for the newly built cluster
LockedBitmap TargetFrame = new LockedBitmap(FrameBuffer.Width, FrameBuffer.Height);
TargetFrame.LockBits();
// Iterate through each element of the matrix of pixels for the current image
for (Int32 Row = 0; Row < FrameBuffer.Width; Row++)
{
for (Int32 Col = 0; Col < Height; Col++)
{
// For each pixel in this matrix, compute the value of color offset of the current centroid super-pixel
double OffsetClr = GetEuclClr(new KMCPoint <int>(Row, Col, FrameBuffer.GetPixel(Row, Col)),
new KMCPoint <int>(Centroids[Cnt].X, Centroids[Cnt].Y, Centroids[Cnt].Clr));
//Perform a check if the color offset value does not exceed the value of boundary parameter
if (OffsetClr <= 50)
{
// Copy the current pixel to the target image for the newly created cluster
TargetFrame.SetPixel(Row, Col, Centroids[Cnt].Clr);
}
// Otherwise, set the color of the current pixel to "white" (R;G;B) => (255;255;255)
// in the target bitmap for the newly built cluster
else
{
TargetFrame.SetPixel(Row, Col, Color.FromArgb(255, 255, 255));
}
}
}
TargetFrame.UnlockBits();
// Create an array of centroid super-pixels and append
// it the value of current centroid super-pixel retrieved
List <KMCPoint <int> > TargetCnts = new List <KMCPoint <int> >();
TargetCnts.Add(Centroids[0]);
// Compute the "mean" value for the newly created cluster
KMCPoint <int> Mean = m_Clusters.GetMean(TargetFrame, TargetCnts);
// Perform a check if the "mean" point coordinates of the newly created cluster are
// not equal to the coordinates of the current centroid super-pixel (e.g. the centroid
// super-pixel has been moved). If so, append a newly built cluster to the array of clusters
if (Mean.X != m_Clusters[Index].Center.X && Mean.Y != m_Clusters[Index].Center.Y)
{
m_Clusters.Add(TargetFrame, TargetCnts, Mean);
}
FrameIndex++;
}
FrameBuffer.UnlockBits();
}
ResultBitmap.LockBits();
// Iterate through the array of clusters previously obtained
for (Int32 Index = 0; Index < m_Clusters.Count(); Index++)
{
// For each cluster retrieve a specific image containing the segmented area
LockedBitmap FrameOut = new LockedBitmap(m_Clusters[Index].Frame.m_Bitmap);
FrameOut.LockBits();
FrameOut.Save("temp_" + Index + ".jpg");
// Obtain the dimensions of that image
int Width = FrameOut.Width, Height = FrameOut.Height;
// Iterate through the matrix of pixels for the current image and for each
// pixel perform a check if its color is not equal to "white" (R;G;B) => (255;255;255).
// If not, copy the pixel data to the target matrix of pixels for the resulting segmented image
for (Int32 Row = 0; Row < Width; Row++)
{
for (Int32 Col = 0; Col < Height; Col++)
{
if (FrameOut.GetPixel(Row, Col) != Color.FromArgb(255, 255, 255))
{
ResultBitmap.SetPixel(Row, Col, FrameOut.GetPixel(Row, Col));
}
}
}
FrameOut.UnlockBits();
}
ResultBitmap.UnlockBits();
// Save the segmented image to file with name which is the value of OutputFile variable
//ResultBitmap.Save(OutputFile);
watch.Stop(); // Stop the execution timer
// Obtain the value of executing time in milliseconds
var elapsedMs = watch.ElapsedMilliseconds;
// Create timespan from the elapsed milliseconds value
TimeSpan ts = TimeSpan.FromMilliseconds(elapsedMs);
// Print the message "Done" and the formatted execution time
Console.WriteLine("***Done***\n" + ts.ToString(@"hh\:mm\:ss"));
return(ResultBitmap.m_Bitmap);
}