Why subtract from img_height?

[tispratik]

labelbox-python/labelbox/exporters/voc_exporter.py

Line 149 in f7ae35d

xy_coords.extend([point['x'], img_height - point['y']])

I wonder why we are subtracting from img_height for XY export function?

[feynmanliang]

Thanks; this was for backwards compatibility but will be removed in v1.0.0