Function log 

pub fn log(src: &impl ToInputArray, dst: &mut impl ToOutputArray) -> Result<()>

Calculates the natural logarithm of every array element.

The function cv::log calculates the natural logarithm of every element of the input array:

Output on zero, negative and special (NaN, Inf) values is undefined.

Parameters

• src: input array.
• dst: output array of the same size and type as src .

See also

exp, cartToPolar, polarToCart, phase, pow, sqrt, magnitude