Peter Corke

There must be something else going on here, for a single pixel blob m00 should be one.

There's a bit of online chatter about this, m00=0 can happen for some malformed contours. See [https://stackoverflow.com/questions/62392240/opencv-cv2-moments-returns-all-moments-to-zero](https://stackoverflow.com/questions/62392240/opencv-cv2-moments-returns-all-moments-to-zero) and [https://github.com/opencv/opencv/issues/7962](https://github.com/opencv/opencv/issues/7962)

accepted with some enhanced comment, need to fix the CI, then will send to PyPi

thanks @dblanding, noted for future revision.

are you working inside a virtual environment like conda? Did you try rehash? this probably should have been reported as a bug rather than errata, it's an issue with the...

resolved?

ok, this looks an error in the spatial math library related to type hints that is occurring for Python 3.10. Leave this with me.

Do you have the latest version of `typing_extensions` installed in this python environment?

Hi @followthwhiterabbit, `rtbtool` was the precursor to `rvctool`, same principles but I suspect it might be a bit buggier. It's roughly equivalent to `rvctool --no-vision`. Not sure why changes to...

I've just done a clean install using conda for Python 3.10, on a Mac, and got no issues. If you still have no luck, are you willing to try it...