/// <summary>
/// Backward cosine transform.
/// </summary>
/// <param name="B">Array</param>
/// <returns>Array</returns>
public float[] Backward(float[] B)
{
int N = B.Length;
float[,] U = CosineTransform.Matrix(N);
return(Matrice.Dot(B, U.Transponate()));
}
/// <summary>
/// Forward cosine transform.
/// </summary>
/// <param name="A">Array</param>
/// <returns>Array</returns>
public float[] Forward(float[] A)
{
int N = A.Length;
float[,] U = CosineTransform.Matrix(N);
return(Matrice.Dot(A, U));
}
/// <summary>
/// Backward cosine transform.
/// </summary>
/// <param name="B">Matrix</param>
/// <returns>Matrix</returns>
public Complex32[,] Backward(Complex32[,] B)
{
int N = B.GetLength(0), M = B.GetLength(1);
float[,] U = CosineTransform.Matrix(N);
float[,] V = CosineTransform.Matrix(M);
if (direction == Direction.Both)
{
return(U.Transponate().Dot(B).Dot(V));
}
else if (direction == Direction.Vertical)
{
return(U.Transponate().Dot(B));
}
return(B.Dot(V));
}
/// <summary>
/// Forward cosine transform.
/// </summary>
/// <param name="A">Matrix</param>
/// <returns>Matrix</returns>
public Complex32[,] Forward(Complex32[,] A)
{
int N = A.GetLength(0), M = A.GetLength(1);
float[,] U = CosineTransform.Matrix(N);
float[,] V = CosineTransform.Matrix(M);
if (direction == Direction.Both)
{
return(U.Dot(A).Dot(V.Transponate()));
}
else if (direction == Direction.Vertical)
{
return(U.Dot(A));
}
return(A.Dot(V.Transponate()));
}
