Zero reference point in Darknet YOLO

Question

I'm trying to manually create label files for some images in YOLO/Darknet, and I need to fill in some values for the bounding boxes.

From the YOLO website (https://pjreddie.com/darknet/yolo/):

Now we need to generate the label files that Darknet uses. Darknet wants a .txt file for each image with a line for each ground truth object in the image that looks like:

[object-class] [x] [y] [width] [height]

Where x, y, width, and height are relative to the image's width and height.

The class, width and height are straight forward, but I'm wondering how to represent the center coordinates for the box, [x] and [y] , as I don't know where the (0,0) reference is allocated.

Thanks

Answer 1

For others who might be wondering, I found the answer to be at the top left corner of the image.