NEW: Mitigate scan position global drift

[carterbox]

Purpose

Mitigate position correction slowly moving the object out of the field of view.

Approach

Use only the center half of the object patches to compute the position update directions. This avoids noise around the edges where information is less dense.

Subtract the mean position update direction using trim_mean before each update. This in theory should keep the object centered by preventing net movement. In practice, there is still a small amount of movement each epoch.

Pre-Merge Checklists

Submitter

• [ ] Write a helpfully descriptive pull request title.
• [ ] Organize changes into logically grouped commits with descriptive commit messages.
• [ ] Document all new functions.
• [ ] Click 'details' on the readthedocs check to view the updated docs.
• [ ] Write tests for new functions or explain why they are not needed.
• [ ] Address any complaints from pep8speaks.

Reviewer

• [ ] Actually read all of the code.
• [ ] Run the new code yourself; the included tests should make this easy.
• [ ] Write a summary of the changes as you understand them.
• [ ] Thank the submitter.

[pep8speaks]

Hello @carterbox! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file src/tike/ptycho/position.py:

Line 285:81: E501 line too long (95 > 80 characters) Line 676:81: E501 line too long (104 > 80 characters)

Comment last updated at 2024-04-18 20:04:20 UTC