public decimal PredictFrame(Ball b, int frame)
{
Image<Bgr, byte> frameImg = video.GetFrame(Camera.StartFrame + frame);
ErodeDilateSimplifier s = new ErodeDilateSimplifier(Camera.Iterations);
BgrThresholdsDetector d = new BgrThresholdsDetector(Camera.MinimumThresholds, Camera.MaximumThresholds);
Image<Bgr, byte> simplifiedFrame = s.Simplify(frameImg);
Blob prediction = d.Detect(simplifiedFrame);
if (prediction != null)
{
int apparentWidth = (prediction.Contour.BoundingRectangle.Width + prediction.Contour.BoundingRectangle.Height) / 2;
Distances[frame] = Camera.FocalLength / apparentWidth * b.Diameter;
}
else
{
Distances[frame] = -1; // Ball could not be located in the frame
}
return Distances[frame];
}
private void DrawHelperCrossHair(int x, int y)
{
ErodeDilateSimplifier simplifier = new ErodeDilateSimplifier((int)configBall_iterations.Value);
Bitmap erodedBitmap = simplifier.Simplify(video.GetFrame((int)configBall_previewFrame.Value)).ToBitmap();
Image erodedBitmapCopy = (Image)erodedBitmap.Clone();
Point intercept = new Point((int)(x / zoom - xOffset), (int)(y / zoom - yOffset));
// Check it is within bounds
if (intercept.X >= 0 && x < erodedBitmapCopy.Width)
{
if (intercept.Y >= 0 && intercept.Y < erodedBitmapCopy.Height)
{
Color point = erodedBitmap.GetPixel(intercept.X, intercept.Y);
using (Graphics g = Graphics.FromImage(erodedBitmapCopy))
{
g.DrawLine(p, new Point(intercept.X, 0), new Point(intercept.X, erodedBitmapCopy.Height));
g.DrawLine(p, new Point(0, intercept.Y), new Point(erodedBitmapCopy.Width, intercept.Y));
g.Save();
}
configBall_blue.Text = "Blue: " + point.B;
configBall_green.Text = "Green: " + point.G;
configBall_red.Text = "Red: " + point.R;
}
}
configBall_helper.Image = erodedBitmapCopy;
}
private void UpdatePreview(object sender = null, EventArgs e = null)
{
ErodeDilateSimplifier simplifier = new ErodeDilateSimplifier((int)configBall_iterations.Value);
Image<Bgr, byte> simplifiedImage = simplifier.Simplify(video.GetFrame((int)configBall_previewFrame.Value));
Bgr minimumThresholds = new Bgr((int)configBall_bMin.Value, (int)configBall_gMin.Value, (int)configBall_rMin.Value);
Bgr maximumThresholds = new Bgr((int)configBall_bMax.Value, (int)configBall_gMax.Value, (int)configBall_rMax.Value);
BgrThresholdsDetector detector = new BgrThresholdsDetector(minimumThresholds, maximumThresholds);
Blob output = detector.Detect(simplifiedImage);
if(output != null)
simplifiedImage.Draw(output.Contour, new Bgr(Color.Azure), 0);
configBall_preview.Image = simplifiedImage.ToBitmap();
}