VOC標籤轉化為YOLO標籤

參考darknet自帶的voc_label.py

 

import xml.etree.ElementTree as ET
import pickle
import os
from os import listdir, getcwd
from os.path import join

classes = ["dog", "cat"]


def convert(size, box):
    dw = 1./(size[0])
    dh = 1./(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)

def convert_annotation(rootpath,xmlname):
    xmlpath = rootpath + `/labels`
    xmlfile = os.path.join(xmlpath,xmlname)
    with open(xmlfile, "r") as in_file:
      txtname = xmlname[:-4]+`.txt`
      txtpath = rootpath + `/labelYOLOs`
      if not os.path.exists(txtpath):
        os.makedirs(txtpath)
      txtfile = os.path.join(txtpath,txtname)
      with open(txtfile, "w+") as out_file:
        tree=ET.parse(in_file)
        root = tree.getroot()
        size = root.find(`size`)
        w = int(size.find(`width`).text)
        h = int(size.find(`height`).text)
        out_file.truncate()
        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)
            xmlbox = obj.find(`bndbox`)
            b = (float(xmlbox.find(`xmin`).text), float(xmlbox.find(`xmax`).text), float(xmlbox.find(`ymin`).text), float(xmlbox.find(`ymax`).text))
            bb = convert((w,h), b)
            out_file.write(str(cls_id) + " " + " ".join([str(a) for a in bb]) + `
`)


if __name__ == "__main__":
    rootpath=`/home/aimhabo/YOLOv3SMP/data`
    xmlpath=rootpath+`/labels`
    list=os.listdir(xmlpath)
    for i in range(0,len(list)) :
        path = os.path.join(xmlpath,list[i])
        if (`.xml` in path)or(`.XML` in path):
            convert_annotation(rootpath,list[i])
            print(`done`, i)
        else:
            print(`not xml file`,i)