private static int FindLargestRadiusIn(ShapeSignature signature)
{
int[][] signaturePoints = signature.Get();
int largestRadius = 0;
for (int i = 0; i < signature.NumberOfSamplingPoints; i++)
{
int[] signaturePointsAtPosition = signaturePoints[i];
int largestRadiusAtIndex = signaturePointsAtPosition.Any() ? signaturePointsAtPosition.Max() : 0;
if (largestRadiusAtIndex > largestRadius)
{
largestRadius = largestRadiusAtIndex;
}
}
return(largestRadius);
}
/// <summary>
/// Gets the signature of an object in <paramref name="image"/> by using a variable number of sampling lines.
/// </summary>
/// <returns>
/// The coordinates of the signature points in an ordered list.
/// The key of the dictionary represents the index of the sampling point.
/// The value represents the radius from the center of all pixels found.
/// </returns>
internal static ShapeSignature GetSignature(BinaryImage image, int numberOfSamplingLines)
{
CheckNumberOfSamplingLinesIsInRange(numberOfSamplingLines);
var signature = new ShapeSignature(numberOfSamplingLines);
int samplingIndex = 0;
var samplingLines = GetSamplingLines(image, numberOfSamplingLines);
foreach (var samplingLine in samplingLines)
{
int[] pointsInAngle = FindAllBlackPixelsOnSamplingLine(image, samplingLine).ToArray();
signature.Add(samplingIndex, pointsInAngle);
samplingIndex++;
}
return(signature);
}
internal static BinaryImage Plot(ShapeSignature signature)
{
int[][] signaturePoints = signature.Get();
int largestRadius = FindLargestRadiusIn(signature);
var image = new BinaryImage(signature.NumberOfSamplingPoints, largestRadius + 3);
for (int i = 0; i < signature.NumberOfSamplingPoints; i++)
{
int[] pointInAngle = signaturePoints[i];
for (int j = 0; j < pointInAngle.Length; j++)
{
int radius = pointInAngle[j];
image[radius, i] = BinaryImage.Black;
}
}
return(image);
}
