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import numpy as np
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import os
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import xml.etree.ElementTree as ET
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from typing import List, Tuple, Union
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from detectron2.data import DatasetCatalog, MetadataCatalog
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from detectron2.structures import BoxMode
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from detectron2.utils.file_io import PathManager
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__all__ = ["load_voc_instances", "register_pascal_voc"]
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CLASS_NAMES = (
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"aeroplane", "bicycle", "bird", "boat", "bottle", "bus", "car", "cat",
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"chair", "cow", "diningtable", "dog", "horse", "motorbike", "person",
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"pottedplant", "sheep", "sofa", "train", "tvmonitor"
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)
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def load_voc_instances(dirname: str, split: str, class_names: Union[List[str], Tuple[str, ...]]):
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"""
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Load Pascal VOC detection annotations to Detectron2 format.
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Args:
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dirname: Contain "Annotations", "ImageSets", "JPEGImages"
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split (str): one of "train", "test", "val", "trainval"
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class_names: list or tuple of class names
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"""
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with PathManager.open(os.path.join(dirname, "ImageSets", "Main", split + ".txt")) as f:
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fileids = np.loadtxt(f, dtype=str)
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annotation_dirname = PathManager.get_local_path(os.path.join(dirname, "Annotations/"))
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dicts = []
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for fileid in fileids:
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anno_file = os.path.join(annotation_dirname, fileid + ".xml")
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jpeg_file = os.path.join(dirname, "JPEGImages", fileid + ".jpg")
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with PathManager.open(anno_file) as f:
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tree = ET.parse(f)
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r = {
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"file_name": jpeg_file,
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"image_id": fileid,
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"height": int(tree.findall("./size/height")[0].text),
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"width": int(tree.findall("./size/width")[0].text),
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}
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instances = []
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for obj in tree.findall("object"):
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cls = obj.find("name").text
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bbox = obj.find("bndbox")
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bbox = [float(bbox.find(x).text) for x in ["xmin", "ymin", "xmax", "ymax"]]
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bbox[0] -= 1.0
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bbox[1] -= 1.0
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instances.append(
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{"category_id": class_names.index(cls), "bbox": bbox, "bbox_mode": BoxMode.XYXY_ABS}
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)
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r["annotations"] = instances
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dicts.append(r)
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return dicts
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def register_pascal_voc(name, dirname, split, year, class_names=CLASS_NAMES):
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DatasetCatalog.register(name, lambda: load_voc_instances(dirname, split, class_names))
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MetadataCatalog.get(name).set(
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thing_classes=list(class_names), dirname=dirname, year=year, split=split
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)
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