1，images,annotations创建

 IMAGES：放图片材料的

ANNTATIONS：放labelImg标记的xml文件

2，labels,txt怎么来的

 labels ：可以手动创建，里面还配置了train,val,test文件夹。可手动（以下代码中没有写）

txt:由一下代码自动生成，前提是images,annotations需要自己去创建

3，xml2txt.py

 images,annotations有了之后直接运行一下代码

import xml.etree.ElementTree as ET
import os, cv2
import numpy as np
from os import listdir
from os.path import join

classes = []


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(xmlpath, xmlname):
    with open(xmlpath, "r", encoding='utf-8') as in_file:
        txtname = xmlname[:-4] + '.txt'
        txtfile = os