@property<EOL><INDENT>def border_pixels(self):<DEDENT>
return mask_util.border_pixels_from_mask(self).astype('<STR_LIT:int>')<EOL>
The indicies of the mask's border pixels, where a border pixel is any unmasked pixel on an
        exterior edge (e.g. next to at least one pixel with a *True* value but not central pixels like those within \
        an annulus mask).