public void water_test()
{
Bitmap water = Accord.Imaging.Image.Clone(Resources.water);
var dt = new DistanceTransform();
Bitmap result = dt.Apply(water);
Assert.AreEqual(111.364265, dt.MaximumDistance, 1e-5);
Assert.AreEqual(new IntPoint(436, 310), dt.UltimateErodedPoint);
Assert.IsNotNull(result);
float[] distance1D;
new ImageToArray().Convert(result, out distance1D);
float[][] distance;
new ImageToMatrix().Convert(result, out distance);
Assert.AreEqual(distance1D.Sum(), distance.Sum());
float[][] distances2 = Jagged.Reshape(dt.Pixels, result.Height, result.Width);
float actual = distances2[84][533];
float expected = 1.4142135f;
Assert.AreEqual(expected, actual);
}
public void ApplyTest1()
{
string localPath = Path.Combine(NUnit.Framework.TestContext.CurrentContext.TestDirectory, "distance");
Directory.CreateDirectory(localPath);
// Bitmap cards = new TestImages().GetImage("cards.jpg");
Bitmap cards = Accord.Imaging.Image.Clone(Resources.cards);
cards.Save(Path.Combine(localPath, "input.jpg"));
Bitmap grayCards = Grayscale.CommonAlgorithms.BT709.Apply(cards);
grayCards.Save(Path.Combine(localPath, "grayscale.jpg"));
Bitmap binaryCards = new Threshold(200).Apply(grayCards);
binaryCards.Save(Path.Combine(localPath, "binary.jpg"));
var dt = new DistanceTransform();
Bitmap result = dt.Apply(binaryCards);
Assert.AreEqual(35.805027, dt.MaximumDistance, 1e-5);
Assert.AreEqual(new IntPoint(254, 129), dt.UltimateErodedPoint);
result.Save(Path.Combine(localPath, "distance_transform.jpg"));
Assert.IsNotNull(result);
}
private int[,] ComputeDistanceTransform(PointsSequence curve)
{
// create points transformed to the [0 .. MAX_RESOLUTION] range.
var points = curve.Points.ToArray();
foreach (var i in Enumerable.Range(0, points.Length))
{
points[i].X = 0.5 * Constants.DISTANCE_TRANSFORM_RESOLUTION * (points[i].X + 1);
points[i].Y = 0.5 * Constants.DISTANCE_TRANSFORM_RESOLUTION * (points[i].Y + 1);
}
// close the curve, if needed
if (curve is Polygon)
{
points = points.Concat(Enumerable.Repeat(points.First(), 1)).ToArray();
}
// compute distance transform and return it
double[,] transform = new double[Constants.DISTANCE_TRANSFORM_RESOLUTION, Constants.DISTANCE_TRANSFORM_RESOLUTION];
DistanceTransform.Compute(points, transform);
int[,] result = new int[Constants.DISTANCE_TRANSFORM_RESOLUTION, Constants.DISTANCE_TRANSFORM_RESOLUTION];
for (int x = 0; x < Constants.DISTANCE_TRANSFORM_RESOLUTION; ++x)
{
for (int y = 0; y < Constants.DISTANCE_TRANSFORM_RESOLUTION; ++y)
{
result[x, y] = (int)Math.Round(16 * transform[x, y]);
Debug.Assert(result[x, y] >= 0);
}
}
return(result);
}
public void ApplyTest1()
{
// Bitmap cards = new TestImages().GetImage("cards.jpg");
Bitmap cards = Accord.Imaging.Image.Clone(Resources.cards);
cards.Save(@"c:\Temp\input.jpg");
Bitmap grayCards = Grayscale.CommonAlgorithms.BT709.Apply(cards);
grayCards.Save(@"c:\Temp\grayscale.jpg");
Bitmap binaryCards = new Threshold(200).Apply(grayCards);
binaryCards.Save(@"c:\Temp\binary.jpg");
var dt = new DistanceTransform();
Bitmap result = dt.Apply(binaryCards);
Assert.AreEqual(35.805027, dt.MaximumDistance, 1e-5);
Assert.AreEqual(new IntPoint(254, 129), dt.UltimateErodedPoint);
result.Save(@"c:\Temp\distance_transform.jpg");
Assert.IsNotNull(result);
}