public Human(double x, double y, double width, double height, double frameWidth, double frameHeight)
{
BL = RelativePoint.FromFrame(new Point(x, y + height), frameWidth, frameHeight);
TL = RelativePoint.FromFrame(new Point(x, y), frameWidth, frameHeight);
TR = RelativePoint.FromFrame(new Point(x + width, y), frameWidth, frameHeight);
BR = RelativePoint.FromFrame(new Point(x + width, y + height), frameWidth, frameHeight);
Center = RelativePoint.FromFrame(new Point(x + width / 2, y + height / 2), frameWidth, frameHeight);
BottomCenter = RelativePoint.FromFrame(new Point(x + width / 2, y + height), frameWidth, frameHeight);
}
public RelativePoint Perspective(Point2d point)
{
// Evaluate the homographic transform
double x = point.X / TopBottomDistance;
double y = point.Y / LeftRightDistance;
double T = g * x + h * y + 1;
var normPoint = new Point((a * x + b * y) / (double)T + p[0].X, (d * x + e * y) / (double)T + p[0].Y);
return(RelativePoint.FromNorm(normPoint, session.FrameSource.Width, session.FrameSource.Height));
}
public Point2d?Perspective(RelativePoint point)
{
if (!GeometryHelpers.IsInside(point, BL, TL, TR, BR))
{
return(null);
}
double px = p[0].X;
double py = p[0].Y;
double xp = point.Norm.X;
double yp = point.Norm.Y;
double detD = ((a + g * px - g * xp) * (e + h * py - h * yp)) - ((d + g * py - g * yp) * (b + h * px - h * xp));
double detDx = ((xp - px) * (e + h * py - h * yp)) - ((yp - py) * (b + h * px - h * xp));
double detDy = ((a + g * px - g * xp) * (yp - py)) - ((d + g * py - g * yp) * (xp - px));
double x = detDx / detD;
double y = detDy / detD;
double normX = x * TopBottomDistance;
double normY = y * LeftRightDistance;
return(new Point2d(normX, normY));
}
