static Func <IplImage, IplImage, Scalar> ActivationFunction(ReduceOperation operation)
{
switch (operation)
{
case ReduceOperation.Avg: return(CV.Avg);
case ReduceOperation.Max: return((image, mask) =>
{
Scalar min, max;
MinMaxLoc(image, mask, out min, out max);
return max;
});
case ReduceOperation.Min: return((image, mask) =>
{
Scalar min, max;
MinMaxLoc(image, mask, out min, out max);
return min;
});
case ReduceOperation.Sum: return((image, mask) => CV.Sum(mask));
default: throw new InvalidOperationException("The specified reduction operation is invalid.");
}
}
public static Reductor Get(ReduceOperation operation)
{
if (operation == ReduceOperation.Custom)
{
throw new NotSupportedException(
"Custom reduce operation must be specified explicitly.");
}
return Cache[operation];
}
/// <summary>
/// transforms 2D matrix to 1D row or column vector by taking sum, minimum, maximum or mean value over all the rows
/// </summary>
/// <param name="dim">The dimension index along which the matrix is reduced.
/// 0 means that the matrix is reduced to a single row and 1 means that the matrix is reduced to a single column</param>
/// <param name="rtype"></param>
/// <param name="dtype">When it is negative, the destination vector will have
/// the same type as the source matrix, otherwise, its type will be CV_MAKE_TYPE(CV_MAT_DEPTH(dtype), mtx.channels())</param>
/// <returns></returns>
public Mat Reduce(ReduceDimension dim, ReduceOperation rtype, int dtype)
{
var dst = new Mat();
Cv2.Reduce(this, dst, dim, rtype, dtype);
return dst;
}
/// <summary>
/// transforms 2D matrix to 1D row or column vector by taking sum, minimum, maximum or mean value over all the rows
/// </summary>
/// <param name="src"></param>
/// <param name="dst"></param>
/// <param name="dim"></param>
/// <param name="rtype"></param>
/// <param name="dtype"></param>
public static void Reduce(InputArray src, OutputArray dst, ReduceDimension dim, ReduceOperation rtype, int dtype)
{
if (src == null)
throw new ArgumentNullException("src");
if (dst == null)
throw new ArgumentNullException("dst");
src.ThrowIfDisposed();
dst.ThrowIfNotReady();
NativeMethods.core_reduce(src.CvPtr, dst.CvPtr, (int)dim, (int)rtype, dtype);
dst.Fix();
}
internal static extern void cvReduce(Arr src, Arr dst, int dim, ReduceOperation op);
