crop_params/README.md

Crop parameters

One square crop box per clip that frames the signer, found by running a YOLO person detector on every frame (code: pjm-data, step 05). The videos are stored uncropped; the crop is applied when loading data.

• crop_params.lmdb/: LMDB with the clip key (the __key__ of the segment record) as key and a msgpack map as value: x_start, y_start, x_end, y_end and padding (top, bottom, left, right). It covers all 39,813 segments, before the dataset filters.
• failed.csv: the 4 clips that could not be opened (video_name, exception).

import lmdb, msgpack

env = lmdb.open("crop_params.lmdb", readonly=True, lock=False)
with env.begin() as txn:
    box = msgpack.unpackb(txn.get(b"001_000_M"))