Function magnitude 

pub fn magnitude(
    x: &impl ToInputArray,
    y: &impl ToInputArray,
    magnitude: &mut impl ToOutputArray,
) -> Result<()>

Calculates the magnitude of 2D vectors.

The function cv::magnitude calculates the magnitude of 2D vectors formed from the corresponding elements of x and y arrays:

Parameters

• x: floating-point array of x-coordinates of the vectors.
• y: floating-point array of y-coordinates of the vectors; it must have the same size as x.
• magnitude: output array of the same size and type as x.

See also

cartToPolar, polarToCart, phase, sqrt