/// <summary>
/// Check if a contour has the features of a plate
/// </summary>
/// <param name="type_of_plate">0: rectangle plate, 1: square plate</param>
/// <param name="area"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <returns></returns>
public static bool ratio_check(type_of_plate type, double area, double width, double height)
{
double aspect = 0;
int area_min = 0;
int area_max = 0;
double rmin = 0;
double rmax = 0;
if (type == type_of_plate.RECT_PLATE)
{
aspect = 4.272727;
area_min = 3000;
area_max = 60000;
rmin = 2.5;
rmax = 7;
}
else if (type == type_of_plate.SQUARE_PLATE)
{
aspect = 4.272727;
area_min = 4000;
area_max = 30000;
rmin = 0.5;
rmax = 1.5;
}
double ratio = width / height;
if (ratio < 1)
{
ratio = 1 / ratio;
}
if ((area < area_min || area > area_max) || (ratio < rmin || ratio > rmax))
{
return(false);
}
else
{
return(true);
}
}
/// <summary>
/// Check if a contour has the features of a plate
/// </summary>
/// <param name="type">0: rectangle plate, 1: square plate</param>
/// <param name="feature">contains X, Y, Width, Height and angle of the plate</param>
/// <returns></returns>
public static bool validate_rotation_and_ratio(type_of_plate type, RotatedRect plate_feature)
{
Rectangle r = plate_feature.MinAreaRect();
double W = r.Width;
double H = r.Height;
double angle = plate_feature.Angle;
if (W > H)
{
angle = (-1) * angle;
}
else
{
angle = 90 + angle;
}
if (angle > 15)
{
return(false);
}
if (W == 0 || H == 0)
{
return(false);
}
double area = W * H;
if (ratio_check(type, area, W, H))
{
return(true);
}
else
{
return(false);
}
}
