Fix for error in 'Using Polar and Log-Polar Transformations for Registration' (#6304)

[mellertd]

Description

Bug fix to close #6304. The addition of the normalization parameter that defaults to "phase" in the phase_cross_correlation function changed the result in the example to be incorrect. I still don't fully understand why this happened, but across all examples in this particular gallery example, setting normalization to None causes small to significant improvements to the performance of the approach. I think this is worth further investigation, but not enough to hold up this fix.

Checklist

• Docstrings for all functions
• Gallery example in ./doc/examples (new features only)
• Benchmark in ./benchmarks, if your changes aren't covered by an
  existing benchmark
• Unit tests
• Clean style in the spirit of PEP8
• Descriptive commit messages (see below)

For reviewers

• Check that the PR title is short, concise, and will make sense 1 year
  later.
• Check that new functions are imported in corresponding __init__.py.
• Check that new features, API changes, and deprecations are mentioned in
  doc/release/release_dev.rst.
• There is a bot to help automate backporting a PR to an older branch. For
  example, to backport to v0.19.x after merging, add the following in a PR
  comment: @meeseeksdev backport to v0.19.x
• To run benchmarks on a PR, add the run-benchmark label. To rerun, the label
  can be removed and then added again. The benchmark output can be checked in
  the "Actions" tab.

[lagru]

Looks like that did the trick. To compare: 0.18.x, 0.19.x, this PR

0.18.x and this PR seem almost identical. However the "Recovered value for scaling difference" in Part 1 is close but still not the same. But this does not change the qualitative statement of the example.

Thanks @mellertd!

[grlee77]

Thanks @mellertd

[grlee77]

@meeseeksdev backport to v0.19.x

[VolkerH]

@meeseeksdev backport to v0.19.x

What a cool bot is that?

[jni]

https://github.com/MeeseeksBox/MeeseeksDev/ by @Carreau. It's so good. ❤️

[Carreau]

@blink1073 has done most of the recent updates, so as many kudoes go to him.
You can see some stats about what the bot does here: https://meeseeksbox.github.io/