Feature Request: methods of boundingboxes extended

[Kongsea]

First, thank you for this amazing tools.
Then, I think we can add a parameter, say, percentage, for methods of boundingboxes such as:
is_fully_within_image(image)
is_out_of_image(image[, fully, partly])
is_partly_within_image(image)
and so on.
So these boundingboxes can be determined whether out or not of an image according to this parameter.
Thank you.