/// <summary>
/// Count the number of black/white transitions for a single ellipse
/// </summary>
/// <param name="e">Ellipse</param>
/// <param name="matrix">Affine ellipse frame that transforms the ellipse to a circle located at origin</param>
/// <param name="gray">Binary image</param>
/// <returns>The number of black/white transitions found</returns>
private int CountBinaryTransitions(DetectedEllipse e, Matrix matrix, Emgu.CV.Image <Gray, byte> gray)
{
// Generate points on circle
double r = e.Ellipse.MCvBox2D.size.Height * 0.5;
double t_step = (2 * Math.PI) / _number_circle_points;
System.Drawing.Rectangle rect = new System.Drawing.Rectangle(System.Drawing.Point.Empty, gray.Size);
int count_transitions = 0;
double last_intensity = 0;
for (double t = 0; t <= 2 * Math.PI; t += t_step)
{
Vector v = new Vector(new double[] { r *Math.Cos(t), r * Math.Sin(t), 1.0 });
Vector x = matrix.Multiply(v.ToColumnMatrix()).GetColumnVector(0);
System.Drawing.Point p = new System.Drawing.Point((int)Math.Round(x[0]), (int)Math.Round(x[1]));
if (rect.Contains(p))
{
if (t == 0)
{
last_intensity = gray[p].Intensity;
}
else
{
double i = gray[p].Intensity;
if (i != last_intensity)
{
count_transitions += 1;
last_intensity = i;
}
}
}
}
return(count_transitions);
}
/// <summary>
/// Count the number of black/white transitions for a single ellipse
/// </summary>
/// <param name="e">Ellipse</param>
/// <param name="matrix">Affine ellipse frame that transforms the ellipse to a circle located at origin</param>
/// <param name="gray">Binary image</param>
/// <returns>The number of black/white transitions found</returns>
private int CountBinaryTransitions(DetectedEllipse e, Matrix matrix, Emgu.CV.Image<Gray, byte> gray) {
// Generate points on circle
double r = e.Ellipse.MCvBox2D.size.Height * 0.5;
double t_step = (2 * Math.PI) / _number_circle_points;
System.Drawing.Rectangle rect = new System.Drawing.Rectangle(System.Drawing.Point.Empty, gray.Size);
int count_transitions = 0;
double last_intensity = 0;
for (double t = 0; t <= 2 * Math.PI; t += t_step) {
Vector v = new Vector(new double[] { r * Math.Cos(t), r * Math.Sin(t), 1.0 });
Vector x = matrix.Multiply(v.ToColumnMatrix()).GetColumnVector(0);
System.Drawing.Point p = new System.Drawing.Point((int)Math.Round(x[0]), (int)Math.Round(x[1]));
if (rect.Contains(p)) {
if (t == 0) {
last_intensity = gray[p].Intensity;
} else {
double i = gray[p].Intensity;
if (i != last_intensity) {
count_transitions += 1;
last_intensity = i;
}
}
}
}
return count_transitions;
}
