public static Utils.RectData[] TwoPass(Bitmap labels, Bitmap srcBitmap, Tree root, int background)
{
DisjointSets linked = new DisjointSets(root.Width * root.Height);
int bottom = root.Top + root.Height;
int right = root.Left + root.Width;
int numelements = IdentifyComponents(labels, srcBitmap, linked, root, root.GetHashCode(), bottom, right, background);
//Run the second pass through the image to label each component
//and create bounding rectangles
LabelComponentsAndSetBoundingBoxes(labels, linked, root.Top, root.Left, bottom, right, background);
return(GetRectsFromLabeledImage(labels, srcBitmap, numelements, root.Top, root.Left, bottom, right, background));
}
public static Utils.RectData[] TwoPass(Bitmap labels, Bitmap srcBitmap, Tree root, int background)
{
DisjointSets linked = new DisjointSets(root.Width * root.Height);
int bottom = root.Top + root.Height;
int right = root.Left + root.Width;
int numelements = IdentifyComponents(labels, srcBitmap, linked, root, root.GetHashCode(), bottom, right, background);
//Run the second pass through the image to label each component
//and create bounding rectangles
LabelComponentsAndSetBoundingBoxes(labels, linked, root.Top, root.Left, bottom, right, background);
return GetRectsFromLabeledImage(labels, srcBitmap, numelements, root.Top, root.Left, bottom, right, background);
}
private static void LabelComponentsAndSetBoundingBoxes(Bitmap labels, DisjointSets linked, int top, int left, int bottom, int right, int background)
{
//Run the second pass through the image to label each component
//and create bounding rectangles
for (int row = top; row < bottom; row++)
{
for (int col = left; col < right; col++)
{
if (labels[row, col] != background)
{
int id = linked.Find(labels[row, col]);
labels[row, col] = id;
}
}
}
}
private static void LabelComponentsAndSetBoundingBoxes(Bitmap labels, DisjointSets linked, int top, int left, int bottom, int right, int background)
{
//Run the second pass through the image to label each component
//and create bounding rectangles
for (int row = top; row < bottom; row++)
{
for (int col = left; col < right; col++)
{
if (labels[row, col] != background)
{
int id = linked.Find(labels[row, col]);
labels[row, col] = id;
}
}
}
}
private static int IdentifyComponents(Bitmap labels, Bitmap srcBitmap, DisjointSets linked, Tree toProcess, int treeNodeIndex, int bottom, int right, int background)
{
int numElements = 0;
//Run the first pass through the image to find any foreground content
int[] neighbors = new int[8];
for (int row = toProcess.Top; row < bottom; row++)
{
for (int col = toProcess.Left; col < right; col++)
{
int sourcepixel = srcBitmap[row, col];
if (sourcepixel == treeNodeIndex)
{
int neighborCount = NeighborsConnected8(neighbors, toProcess, row, col, labels, background);
if (neighborCount == 0)
{
labels[row, col] = numElements+1;
numElements++;
}
else
{
int min = Min(neighbors, neighborCount);
labels[row, col] = min;
for(int i = 0; i < neighborCount; i++)
{
linked.union(min, neighbors[i]);
}
}
}
else
labels[row, col] = background;
}
}
return numElements;
}
private static int IdentifyComponents(Bitmap labels, Bitmap srcBitmap, DisjointSets linked, Tree toProcess, int treeNodeIndex, int bottom, int right, int background)
{
int numElements = 0;
//Run the first pass through the image to find any foreground content
int[] neighbors = new int[8];
for (int row = toProcess.Top; row < bottom; row++)
{
for (int col = toProcess.Left; col < right; col++)
{
int sourcepixel = srcBitmap[row, col];
if (sourcepixel == treeNodeIndex)
{
int neighborCount = NeighborsConnected8(neighbors, toProcess, row, col, labels, background);
if (neighborCount == 0)
{
labels[row, col] = numElements + 1;
numElements++;
}
else
{
int min = Min(neighbors, neighborCount);
labels[row, col] = min;
for (int i = 0; i < neighborCount; i++)
{
linked.union(min, neighbors[i]);
}
}
}
else
{
labels[row, col] = background;
}
}
}
return(numElements);
}
