Interactive numpy image - is it possible?

Asked Jan 21 '22 at 17:38

Active Jan 21 '22 at 19:44

Viewed 34 times

I have a 2D numpy array (image) which I visualise using plt.imshow().

What I want: a user to be able to click on a given pixel on this image (matrix/2D array) and the indices of this particular element to be saved as variables - for example i = 200 and j = 150.

The end goal is for the user to be able to crop a part of the image for further processing of this part of the array.

If anyone knows how to apply a region of interest (by dragging the mouse along the image/2D array), even better.

edited Jan 21 '22 at 19:44

Cris Luengo

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asked Jan 21 '22 at 17:38

ISquared

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is plt the matplotlib.pyplot library? – Jan 21 '22 at 17:43
Here's an idea... https://stackoverflow.com/a/42297587/2836621 – Mark Setchell Jan 21 '22 at 17:47
I think OP wants a Python solution. But he didn't attempt to provide any example of code. – mathfux Jan 21 '22 at 18:08
OpenCV code is always the same. translation from C++ to python has all the same APIs. -- I would suggest doing this with just OpenCV, no matplotlib. use `cv.selectROI` – Christoph Rackwitz Jan 21 '22 at 19:27

Interactive numpy image - is it possible?

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