private Area GetAssociatedArea(GTLocation groundTruth)
{
return(_production.AreaConfig.Single(a => a.GTRegionStart <= groundTruth.Estimated && a.GTRegionStop > groundTruth.Estimated));
}
private static IEnumerable <GTLocation> ProcessTake(Guid cameraId, Take take, Mat reference)
{
var media = take.Media.Single(m => m.CameraId == cameraId);
var camera = new Capture(media.Url.AbsoluteUri + "full_720p.mp4");
var gtLocations = new List <GTLocation>();
CvInvoke.NamedWindow("Feed");
CvInvoke.NamedWindow("Reference");
CvInvoke.NamedWindow("Delta");
var frame = new Mat();
var resize = new Mat();
var delta = new Mat();
var grey = new Mat();
var blur = new Mat();
var thresh = new Mat();
var dilate = new Mat();
camera.Start();
var frameCount = camera.GetCaptureProperty(CapProp.FrameCount);
var fps = camera.GetCaptureProperty(CapProp.Fps);
var frameNumber = 0;
camera.ImageGrabbed += (sender, eventArgs) =>
{
try
{
Console.Write($"\r Processing frame: {frameNumber}/{frameCount}");
camera.Retrieve(frame);
CvInvoke.Resize(frame, resize, Resolution);
CvInvoke.CvtColor(resize, grey, ColorConversion.Bgr2Gray);
CvInvoke.GaussianBlur(grey, blur, new Size(21, 21), 0);
CvInvoke.AbsDiff(reference, blur, delta);
CvInvoke.Threshold(delta, thresh, 25, 255, ThresholdType.Binary);
CvInvoke.Rectangle(thresh, new Rectangle(0, 0, Resolution.Width, Resolution.Height - ROI.Height), new MCvScalar(0), -1);
CvInvoke.Imshow("Reference", reference);
CvInvoke.Dilate(thresh, dilate, null, Point.Empty, 0, BorderType.Default, new MCvScalar());
CvInvoke.Imshow("Delta", dilate);
VectorOfVectorOfPoint conts = new VectorOfVectorOfPoint();
CvInvoke.FindContours(dilate, conts, null, RetrType.External, ChainApproxMethod.ChainApproxSimple);
for (var i = 0; i < conts.Size; i++)
{
if (CvInvoke.ContourArea(conts[i]) < MinArea)
{
continue;
}
var rect = CvInvoke.BoundingRectangle(conts[i]);
CvInvoke.Rectangle(resize, rect, new MCvScalar(0, 255), 2);
CvInvoke.Rectangle(resize, ROI, new MCvScalar(255), 2);
CvInvoke.Imshow("Reference", resize);
var location = new GTLocation
{
Timestamp = media.StartTime.AddSeconds(frameNumber / fps),
Position = new Rect
{
X = (float)rect.X / frame.Width,
Y = (float)rect.Y / frame.Height,
Width = (float)rect.Width / frame.Width,
Height = (float)rect.Height / frame.Height
}
};
location.Estimated = location.Position.X + location.Position.Width / 2;
gtLocations.Add(location);
}
}
catch (Exception e)
{
Console.WriteLine($" Unable to process capture: {take.Name} - {e.Message}:{e.StackTrace}");
}
frameNumber++;
};
while (frameNumber < frameCount)
{
CvInvoke.WaitKey(100);
}
camera.Stop();
camera.Dispose();
return(gtLocations);
}
