How to save roi coordinates [x1,y1,x2,y2] to achieve the detected objects length from faster rcnn outout?

[MitraTj]

Hi,

I am doing a project in which I need to have the values for object's length and area. I used faster rcnn and mask rcnn for detection and segmentation, respectively. for length measurement, how to find and save object coordinate? For area, how to count the number of pixels in each segmented objects. Thanks