cospectrum

Rebased

@brainstorm Try `image = "0.24"`. We haven't updated to "0.25" yet.

@brainstorm 0.25 and 0.24 are not semver compatible, cargo will treat them as 2 different crates. `imageproc` depends on `0.24` both in master and on crates.io

I would recommend relying on auto-vectorization

Rebased

`[email protected] ----no-default-features` also doesn't compile. 0.18 seems ok