Output the value of the bounding box

[Limingxing00]

Suppose I input the image size WxH is 1920x1080, for the coordinate value range of H axis is 0 to 1079 or 1 to 1080? The predicted bounding box I get contains points on the boundary, such as H=1080.0 .

[jbwang1997]

This document may help you.
https://mmdetection.readthedocs.io/en/latest/compatibility.html#coordinate-system

[Limingxing00]

Hi,

Thank you for the fast reply!

I see "The new coordinate system is consistent with Detectron2 and treats the center of the most left-top pixel as (0, 0) rather than the left-top corner of that pixel. Accordingly, the system interprets the coordinates in COCO bounding box and segmentation annotations as coordinates in range [0, width] or [0, height]."

But, why are the coordinates 0 and width both included in the range [0, width]? The length of the entire image is width.

[jbwang1997]

In my understand, 0 means the point is at the left of the first pixel and width means the point is at the right of the last pixel.

[Limingxing00]

thank you!