A better way to calculate object area

[jamiechoi1995]

According to your paper, objects that smaller than 2% will be ignored.

sg2im/sg2im/data/coco.py

Line 152 in 2638373

_, _, w, h = object_data['bbox']

but this code only consider the width and height,
and this could not reflect the true area of an object,

For example, this is a "clothes" stuff, and most of the area is blank. (Original image: http://cocodataset.org/#explore?id=245764)

the area calculated by w and h is 10692,
but if you use codes like `np.sum(mask)', you get a more accurate area of 1115.