What is the difference between 'size_height_width {' and ' size_min {' in faster_rcnn spec file?

I have seen the following parameter in example/specs/faster_rcnn_train.txt spec file

size_height_width {
height: 384
width: 1280
}

But in some spec file , its replaced by the following parameter

size_min {

min:700
}

what is the difference between them? which one i choose?

Hi samjith888,
If set
size_min {
min:700
}

That equals to
size_height_width {
height: 700
width: 700
}