Thanks for taking your time to report this issue and help making Ubuntu
better.

>"zesty+1". I'm not sure if that means 17.04.2 or not.

+1 is referring to the next release after zesty, i.e. artful (17.10).
Presumably the original comment was written before the new code name was
announced.

Artful currently contains opencv 3.1.0+dfsg1-1~exp1ubuntu1 (with a newer
version waiting in -proposed), see
https://launchpad.net/ubuntu/+source/opencv. Once a newer version is
available in the development version in Ubuntu, most upgrade request
issues are considered fixed, because a newer version is available and
people will upgrade at some point.

In some cases, it makes sense to offer the newer version for older
releases as well though, you can take a look at how on "Requesting a
Backport" at
https://wiki.ubuntu.com/UbuntuBackports#Requesting_a_Backport. (In some
cases, individual fixes are also applied to older releases (Stable
Release Upgrades)). So it might be possible to get a backport of 3.1
available in 16.04 for instance. I am not familiar with this library,
but be aware that newer version of libraries often require newer version
of their dependencies, so it might not be straight-forward to copy over
the sources to 16.04 and rebuild them.

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https://bugs.launchpad.net/bugs/1705861

Title:
  Update OpenCV to 3.x

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