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voc2yolo5_obb.py
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voc2yolo5_obb.py
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# https://zhuanlan.zhihu.com/p/391137600
import xml.etree.ElementTree as ET
import math
import glob
from pathlib import Path
from pprint import pprint
def convert_bndbox(size, xmlbox, cls_id):
b = (
float(xmlbox.find("xmin").text),
float(xmlbox.find("xmax").text),
float(xmlbox.find("ymin").text),
float(xmlbox.find("ymax").text),
)
b1, b2, b3, b4 = b
if b2 > w:
b2 = w
if b4 > h:
b4 = h
b = (b1, b2, b3, b4)
def convert(size, box):
dw = 1.0 / (size[0])
dh = 1.0 / (size[1])
x = (box[0] + box[1]) / 2.0 - 1
y = (box[2] + box[3]) / 2.0 - 1
w = box[1] - box[0]
h = box[3] - box[2]
x = x * dw
w = w * dw
y = y * dh
h = h * dh
return x, y, w, h
bb = convert((w, h), b)
return f'{cls_id} {" ".join([str(a) for a in bb])}\n'
def convert_robndbox(size, xmlbox, name):
cx, cy, w, h = (
float(xmlbox.find("cx").text),
float(xmlbox.find("cy").text),
float(xmlbox.find("w").text),
float(xmlbox.find("h").text),
)
angle = float(xmlbox.find("angle").text)
x1 = cx + (w / 2) * math.cos(angle) - (h / 2) * math.sin(angle)
y1 = cy + (w / 2) * math.sin(angle) + (h / 2) * math.cos(angle)
x2 = cx - (w / 2) * math.cos(angle) - (h / 2) * math.sin(angle)
y2 = cy - (w / 2) * math.sin(angle) + (h / 2) * math.cos(angle)
x3 = cx - (w / 2) * math.cos(angle) + (h / 2) * math.sin(angle)
y3 = cy - (w / 2) * math.sin(angle) - (h / 2) * math.cos(angle)
x4 = cx + (w / 2) * math.cos(angle) + (h / 2) * math.sin(angle)
y4 = cy + (w / 2) * math.sin(angle) - (h / 2) * math.cos(angle)
# https://github.com/otamajakusi/yolov5_obb/blob/master/docs/GetStart.md
return f"{x1} {y1} {x2} {y2} {x3} {y3} {x4} {y4} {name} 0\n"
def convert_annotation(xml, classes):
tree = ET.parse(xml)
root = tree.getroot()
size = root.find("size")
w = int(size.find("width").text)
h = int(size.find("height").text)
yolo = ""
for obj in root.iter("object"):
difficult = obj.find("difficult").text
cls = obj.find("name").text
if cls not in classes or int(difficult) == 1:
continue
cls_id = classes.index(cls)
while True:
xmlbox = obj.find("robndbox")
if xmlbox:
yolo += convert_robndbox((w, h), xmlbox, cls)
break
xmlbox = obj.find("bndbox")
if xmlbox:
yolo += convert_bndbox((w, h), xmlbox, cls_id)
break
print("WARN: neither robndbox nor bndbox was found")
break
return yolo
def voc2yolo(path: Path, class_file):
if path.is_dir():
xmls = [Path(f) for f in glob.glob(f"{path}/*.xml")]
else:
xmls = [path]
classes = open(class_file).read().splitlines()
for xml in xmls:
with open(xml) as in_file:
yolo = convert_annotation(in_file, classes)
with open(f"{xml.parent / xml.stem}.txt", "w") as out_file:
out_file.write(yolo)
if __name__ == "__main__":
import argparse
parser = argparse.ArgumentParser(formatter_class=argparse.RawTextHelpFormatter)
parser.add_argument("--path", required=True)
parser.add_argument("--class-file", required=True)
args = parser.parse_args()
voc2yolo(Path(args.path), args.class_file)