How to apply a threshold inside a polygon ROI only ?

[a.chef...@gmail.com]

Hi everyone,

I've read somewhere (here) that it is not possible to make polygon crop. I was wondering if it is possible to restrict a thresholding process to the inside of a polygon ROI, and how ?

Thank you so much !

Cheers,

[Stephane]

Hi,

In fact you cannot do that directly but if you really want to do it what you can do is the following :
- duplicate your image
- inverse your ROI
- use the "fill sequence" operation to fill the content of your inverted ROI with value 0
- then process the threshold.

Of course you can automatize the process if you need to replicate it on many images !

Best,

- Stephane