 — Padding to be added to the crop region. Defaults to 0.   Returns 
tuple
  
(x1, y1, x2, y2) represent a rectangular region that contains all masked ares in an image and matches the original aspect ratio.
  Finds a rectangular region that contains all masked ares in an image, and expands region to match the aspect ratio of the original image;
for example, if user drew mask in a 128x32 region, and the dimensions for processing are 512x512, the