OpenCV: Invert a mask?

Question

Is there a simple way to invert a mask using OpenCV? For example, if I've got a mask like this:

010
111
010

I'd like to invert it and get this:

101
000
101

Note: I'm using OpenCV's Python bindings, so while it would be possible to simply loop over each element in the mask, execution speed could become an issue.

Answer 1

Use a bitwise Not to flip all bits in a matrix.