Region of interest (ROI)

A region of interest (ROI) is a closed area of an image in which you want to focus your image analysis. You can add as many ROIs as you want before starting the polarimetry analysis. ROIs can be polygon-shaped or freeform.

For managing ROI, open the ROI Manager

Add ROI: select an ROI on the Thresholding/Mask tab. Each ROI, once confirmed, is numbered and displayed on the intensity image ([Intensity](https://github.com/cchandre/Polarimetry/wiki/intensity) tab), on the thresholded image ([Thresholding/Mask](https://github.com/cchandre/Polarimetry/wiki/Thresholding-%E2%80%90-Mask) tab) and in the [ROI Manager](https://github.com/cchandre/Polarimetry/wiki/roi-manager). For each ROI, the thresholding needs to be done *before* drawing the ROI.

For polygon-shaped ROIs, click successively the left mouse button.
For freeform ROIs, click continuously the right mouse button.
Double click to close the ROI.

NB: When Add ROI is active, it is not possible to use the navigation toolbar (for, e.g., pan, zoom). First close the ROI before using the navigation toolbar again.