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 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();
}
