How to remove background from an image

There are several Python methods supported for removing an image background. The manual processing required indicating rectangles with objects in advance and also marking background and foreground points. Using the auto-processing method with assumed objects you need to specify the detected object type (e.g. `HUMAN`) and the rectangle area where the object is located. In the other automatic methods, we just use the class AutoMaskingGraphCutOptions class with automatically calculated strokes and set `FeatheringRadius` property to smooth and blur the cutting edge.