Definitions of positional data variables about trex

[mooch443]

Hey!

I have now updated the docs page that you mentioned at https://trex.run/docs/formats.html#positional-data - hopefully this helps! There is a note on there that tries to explain the #pcentroid thing. Let me know if that's understandable.

Depending on the quality/difficulty of the video, outlines and midlines will be slightly off. You can usually improve your results with a few tricks. Just to highlight the most important parameters to look into:

• outline_curvature_range_ratio: This impacts the tail-finding algorithm. If you increase this number (lets say switching from 0.03 to 0.07), the program would search for "larger" peeks, that are likely less "pointy", and the other way around.
• outline_resample: Changes the resolution of the outline. Smaller values produce more outline points (distance from one to the next point).
• outline_approximate: Approximates the outline shape - higher values increase accuracy, but maybe also noise.
• outline_smooth_samples: Smoothes the outline before approximating it (usually does not do that much).

These interfere with each other of course. You may also want to adjust midline_resolution, if you feel like your individual is too big for just 12 points.

-Tristan

[jptumulty]

This is great, thanks for the info and updating the definitions!