Method Idft

Namespace

OpenCvSharp

Assembly

OpenCvSharp.dll

Idft(InputArray, OutputArray, DftFlags, int)

Performs an inverse Discrete Fourier transform of 1D or 2D floating-point array.

public static void Idft(InputArray src, OutputArray dst, DftFlags flags = DftFlags.None, int nonzeroRows = 0)

Parameters

src InputArray

The source array, real or complex

dst OutputArray

The destination array, which size and type depends on the flags

flags DftFlags

Transformation flags, a combination of the DftFlag2 values

nonzeroRows int

When the parameter != 0, the function assumes that only the first nonzeroRows rows of the input array ( DFT_INVERSE is not set) or only the first nonzeroRows of the output array ( DFT_INVERSE is set) contain non-zeros, thus the function can handle the rest of the rows more efficiently and thus save some time. This technique is very useful for computing array cross-correlation or convolution using DFT