Extract ROI to python variable

[G M]

Hi all,

I have embeded a 2d array viewer as a method (viewer) of my class so when I need to plot 2d array data of an instsance of the class let's say "a" I can call a.viewer(), I would like to be able to extract a ROI (sub matrix)  to save in a python variable inside my class e.g. a.ROI  instead to save the ROI as .npy and then reopen it with np.load. Is there any way to do it ?

Thanks for your help!

Best regards,

Giacomo

  def viewer(self):
        #Based on PythonQwt https://pypi.python.org/pypi/guiqwt
        from guiqwt.plot import ImageDialog
        from guiqwt.builder import make
       
        def create_window():
            win = ImageDialog(edit=True, toolbar=True, wintitle=self.name,
                      options=dict(show_contrast=True,show_xsection=True, show_ysection=True, xlabel='stage res.= %s mm x' %(self.resolution), xunit='mm', ylabel="y",yunit='mm',zlabel='Distance',zunit='mm',
                                   show_itemlist=True))
            win.resize(800, 600)
            return win
       


        import guidata
        _app = guidata.qapplication()
        # --
        win = create_window()
        image2 = make.image(a.array, title="Data",xdata=[0,self.array.shape[1]*self.resolution],ydata=[0,self.array.shape[0]*self.resolution],interpolation="nearest")
        plot = win.get_plot()
        plot.add_item(image2, z=1)
        win.exec_()