Change the way EBSD data is linked to a DIC map

MechMicroMan / DefDAP

A python library for correlating EBSD and HRDIC data

Apache License 2.0

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Change the way EBSD data is linked to a DIC map #68

Closed rhysgt closed 3 years ago

rhysgt commented 4 years ago

Currently, a flood-fill algorithm is used to detect grains (defined from an EBSD map) into the DIC map.

An alternative way of doing this, is warping the EBSD grain map directly using the affine (or polynomial etc) transform. Attached is an example of the EBSD grain list, current DIC grain list and my proposed method. It has a few advantages

Very fast (pretty much instantaneous)
Deals with non-indexed points better
EBSD and DIC grains have the same ID number

Since this would be quite a big change, would be a good to get opinions on it and test it before implementing it.

image (1)

rhysgt commented 4 years ago

Have implemented this in the new_dic_grain_detection branch. Have tested with a couple of datasets and works well. The DIC and EBSD grain IDs are not the same (I've made the DIC grain IDs sequential) however the EBSD grain is unambiguously defined within the DIC grain.

mikesmic commented 4 years ago

This is great if we can perform the grain linking in a more direct way. However, with this being a central part of the package we should try and add some testing to the current process and see how this will change with the modifications

rhysgt commented 4 years ago

Sounds reasonable. I mainly implemented this for my benefit but hopefully it will help others when fully tested :)

I have set the default algorithm to be the same as it is currently. To use the new algorithm, set algorithm to warp. I'll work on the timeseries a little bit now

rhysgt commented 3 years ago

Pretty happy that this works pretty reliably now so will close the issue for now.