public void Merge_OverlappingBlobs_OneBlobWithBothBlobs()
{
// 0 1
// 1 0
var b1 = new Blob();
b1.BoundingBox = new Rectangle(1, 1, 2, 2);
b1.Area = 2;
b1.Mask = new byte[] { 96 };
// 1 0
// 0 1
var b2 = new Blob();
b2.BoundingBox = new Rectangle(2, 2, 2, 2);
b2.Area = 2;
b2.Mask = new byte[] { 144 };
var merger = new BlobMerger();
var result = merger.Merge(b1, b2);
// 0 1 0
// 1 1 0
// 0 0 1
Assert.AreEqual(4, result.Area);
Assert.AreEqual(new Rectangle(1, 1, 3, 3), result.BoundingBox);
Assert.AreEqual(88, result.Mask[0]);
Assert.AreEqual(128, result.Mask[1]);
}
public Blob Merge(Blob a, Blob b)
{
var result = new Blob();
result.BoundingBox = Rectangle.Union(a.BoundingBox, b.BoundingBox);
result.Mask = CreateMergedMask(a, b);
result.Area = BitManipulator.CountSetBits(result.Mask);
return result;
}
public byte[] CreateMergedMask(Blob a, Blob b)
{
var resultRect = Rectangle.Union(a.BoundingBox, b.BoundingBox);
var result = new byte[(int)Math.Ceiling((resultRect.Width * resultRect.Height) / 8.0)];
AddToMask(result, resultRect, a.Mask, a.BoundingBox);
AddToMask(result, resultRect, b.Mask, b.BoundingBox);
return result;
}
public Image Convert(Blob blob)
{
Bitmap img = new Bitmap(blob.BoundingBox.Width, blob.BoundingBox.Height, PixelFormat.Format24bppRgb);
int width = blob.BoundingBox.Width;
int height = blob.BoundingBox.Height;
for (int y = 0; y < height; y++)
for (int x = 0; x < width; x++)
img.SetPixel(x, y, (BitManipulator.ToInt32(blob.Mask, y * width + x) == 0) ? Color.White : Color.Black);
return img;
}
private Blob Merge(Blob a, Blob b)
{
Trace.WriteLineIf(IsVerbose, string.Format("BlobDistanceMerge: Sammanslagning av {0} och {1}.", a.BoundingBox, b.BoundingBox));
return Merger.Merge(a, b);
}
