What is the origin of YOLO/darknet coordinates
(0, 0)  is top left.

Here an a helpful blog that goes through all the features in the output vector.

This is common in image processing. There are a few reasons that this is the convention in computer vision. Check here for a list, the accepted answer states:


  This is caused in the history. Early computers had Cathode Ray Tubes (CRTs) which "draw" the image with a cathode ray from the upper left corner to the lower right.