Function mul_spectrums_def

pub fn mul_spectrums_def(
    a: &impl ToInputArray,
    b: &impl ToInputArray,
    c: &mut impl ToOutputArray,
    flags: i32,
) -> Result<()>

Performs the per-element multiplication of two Fourier spectrums.

The function cv::mulSpectrums performs the per-element multiplication of the two CCS-packed or complex matrices that are results of a real or complex Fourier transform.

The function, together with dft and idft, may be used to calculate convolution (pass conjB=false ) or correlation (pass conjB=true ) of two arrays rapidly. When the arrays are complex, they are simply multiplied (per element) with an optional conjugation of the second-array elements. When the arrays are real, they are assumed to be CCS-packed (see dft for details).

Parameters

• a: first input array.
• b: second input array of the same size and type as src1 .
• c: output array of the same size and type as src1 .
• flags: operation flags; currently, the only supported flag is cv::DFT_ROWS, which indicates that each row of src1 and src2 is an independent 1D Fourier spectrum. If you do not want to use this flag, then simply add a 0 as value.
• conjB: optional flag that conjugates the second input array before the multiplication (true) or not (false).

Note

This alternative version of mul_spectrums function uses the following default values for its arguments:

• conj_b: false