Rotate / Flip live image

[CedricEsp]

Hello,

The camera chip I am using is not square and I would like to Flip and rotate the image, I can do that after acquisition in the engine but I wonder if there is an option to rotate the image on the live view as well?

Thanks!
Cedric

[ianhi]

Curious what @tlambert03 thinks but I think I'd prefer to implement such functionality in pymmcore-plus instead of here. Something like:

core.image_transforms.append(np.flip)

and then we could create a widget that allows for re-ordering, adding, and deleting transforms

[ianhi]

As a hack for live view you can monkey patch core.getLastImage with a function that calls the original function and then returns the flipped image. See https://github.com/ianhi/mda-simulator/blob/3ba66e729931a92e463f2ce1cf8a5a5241c898d2/mda_simulator/mmcore/_mmcore.py#L90

an untested guess at this would be:

orig_getLastImage = core.getLastImage

def getLastImageFlipped()->np.ndarray:
    return np.flip(orig_getLastImage())

core.getLastImage = getLastImageFlipped

[tlambert03]

Curious what @tlambert03 thinks but I think I'd prefer to implement such functionality in pymmcore-plus instead of here. Something like:

love that idea. Maybe it's time to generally attack adding functional hooks to the engine?

[ianhi]

love that idea. Maybe it's time to generally attack adding functional hooks to the engine?

When you say "functional hooks" what does that mean?

[tlambert03]

Meaning: it's one thing to be able to connect callbacks to events emitted by the MDA... but that's one way communication: we can't modify the events and or the image in the process. A functional hook would provide a way to modify either the event object and or the image itself before further processing and/or event emission

[ianhi]

Ahh gotcha. Is this something that we should use a library (a la psygnal) for, or is better to go simpler with something like keeping a list of functions to evaluate?