将DOTA标签格式转为VOC格式形成xml文件

DOTA数据集的格式为：

前8个数字分别为gt的4个点坐标（x、y）

转换为VOC标注的代码为：

这里有两种选择

1. 将原有的8坐标转换为4坐标的最小外界矩形，即hbb形式 xmin，ymin，xmax，ymax

2. 保留原有/坐标，即obb形式x0，y0，x1，y1，x2，y2，x3，y3

import os
import cv2
from xml.dom.minidom import Document 
 
#windows下无需
import sys  
stdi, stdo, stde = sys.stdin, sys.stdout, sys.stderr
reload(sys)
sys.setdefaultencoding('utf-8')
sys.stdin, sys.stdout, sys.stderr = stdi, stdo, stde
 
 
category_set = ['ship']  
 
def custombasename(fullname):  
    return os.path.basename(os.path.splitext(fullname)[0])
 
 
def limit_value(a,b):
    if a<1:
        a = 1
    if a>=b:
        a = b-1
    return a
 
    
def readlabeltxt(txtpath, height, width, hbb = True):
    print(txtpath)
    with open(txtpath, 'r') as f_in:   #打开txt文件          
        lines = f_in.readlines()
        splitlines = [x.strip().split(' ') for x in lines]  #根据空格分割
        boxes = []
        for i, splitline  in enumerate(splitlines):
            if i in [0,1]:  #DOTA数据集前两行对于我们来说是无用的
                continue
            label = splitline[8]
            if label not in category_set:#只书写制定的类别      
                continue            
            x1 = int(float(splitline[0]))
            y1 = int(float(splitline[1]))
            x2 = int(float(splitline[2]))
            y2 = int(float(splitline[3]))
            x3 = int(float(splitline[4]))
            y3 = int(float(splitline[5]))  
            x4 = int(float(splitline[6]))
            y4 = int(float(splitline[7]))
            #如果是hbb
            if hbb:
                xx1 = min(x1,x2,x3,x4)
                xx2 = max(x1,x2,x3,x4)
                yy1 = min(y1,y2,y3,y4)
                yy2 = max(y1,y2,y3,y4)
                
                xx1 = limit_value(xx1, width)
                xx2 = limit_value(xx2, width)
                yy1 = limit_value(yy1, height)
                yy2 = limit_value(yy2, height)
                
                box = [xx1,yy1,xx2,yy2,label]
                boxes.append(box)            
            else:  #否则是obb                        
                x1 = limit_value(x1, width)
                y1 = limit_value(y1, height)
                x2 = limit_value(x2, width)
                y2 = limit_value(y2, height)
                x3 = limit_value(x3, width)
                y3 = limit_value(y3, height)   
                x4 = limit_value(x4, width)
                y4 = limit_value(y4, height)
                               
                box = [x1,y1,x2,y2,x3,y3,x4,y4,label]
                boxes.append(box)
    return boxes
 
def writeXml(tmp, imgname, w, h, d, bboxes, hbb = True):  
    doc = Document()  
    #owner  
    annotation = doc.createElement('annotation')  
    doc.appendChild(annotation)  
    #owner  
    folder = doc.createElement('folder')  
    annotation.appendChild(folder)  
    folder_txt = doc.createTextNode("VOC2007")  
    folder.appendChild(folder_txt)  
  
    filename = doc.createElement('filename')  
    annotation.appendChild(filename)  
    filename_txt = doc.createTextNode(imgname)  
    filename.appendChild(filename_txt)  
    #ones#  
    source = doc.createElement('source')  
    annotation.appendChild(source)  
  
    database = doc.createElement('database')  
    source.appendChild(database)  
    database_txt = doc.createTextNode("My Database")  
    database.appendChild(database_txt)  
  
    annotation_new = doc.createElement('annotation')  
    source.appendChild(annotation_new)  
    annotation_new_txt = doc.createTextNode("VOC2007")  
    annotation_new.appendChild(annotation_new_txt)  
  
    image = doc.createElement('image')  
    source.appendChild(image)  
    image_txt = doc.createTextNode("flickr")  
    image.appendChild(image_txt) 
    #owner
    owner = doc.createElement('owner')  
    annotation.appendChild(owner)  
  
    flickrid = doc.createElement('flickrid')  
    owner.appendChild(flickrid)  
    flickrid_txt = doc.createTextNode("NULL")  
    flickrid.appendChild(flickrid_txt) 
    
    ow_name = doc.createElement('name')  
    owner.appendChild(ow_name)  
    ow_name_txt = doc.createTextNode("idannel")  
    ow_name.appendChild(ow_name_txt)
    #onee#  
    #twos#  
    size = doc.createElement('size')  
    annotation.appendChild(size)  
  
    width = doc.createElement('width')  
    size.appendChild(width)  
    width_txt = doc.createTextNode(str(w))  
    width.appendChild(width_txt)  
  
    height = doc.createElement('height')  
    size.appendChild(height)  
    height_txt = doc.createTextNode(str(h))  
    height.appendChild(height_txt)  
  
    depth = doc.createElement('depth') 
    size.appendChild(depth)  
    depth_txt = doc.createTextNode(str(d))  
    depth.appendChild(depth_txt)  
    #twoe#  
    segmented = doc.createElement('segmented')  
    annotation.appendChild(segmented)  
    segmented_txt = doc.createTextNode("0")  
    segmented.appendChild(segmented_txt)  
    
    for bbox in bboxes:
        #threes#  
        object_new = doc.createElement("object")  
        annotation.appendChild(object_new)  
        
        name = doc.createElement('name')  
        object_new.appendChild(name)  
        name_txt = doc.createTextNode(str(bbox[-1]))  
        name.appendChild(name_txt)  
  
        pose = doc.createElement('pose')  
        object_new.appendChild(pose)  
        pose_txt = doc.createTextNode("Unspecified")  
        pose.appendChild(pose_txt)  
  
        truncated = doc.createElement('truncated')  
        object_new.appendChild(truncated)  
        truncated_txt = doc.createTextNode("0")  
        truncated.appendChild(truncated_txt)  
  
        difficult = doc.createElement('difficult')  
        object_new.appendChild(difficult)  
        difficult_txt = doc.createTextNode("0")  
        difficult.appendChild(difficult_txt)  
        #threes-1#  
        bndbox = doc.createElement('bndbox')  
        object_new.appendChild(bndbox)  
  
        if hbb: 
            xmin = doc.createElement('xmin')  
            bndbox.appendChild(xmin)  
            xmin_txt = doc.createTextNode(str(bbox[0]))
            xmin.appendChild(xmin_txt)  
  
            ymin = doc.createElement('ymin')  
            bndbox.appendChild(ymin)  
            ymin_txt = doc.createTextNode(str(bbox[1]))
            ymin.appendChild(ymin_txt)    
  
            xmax = doc.createElement('xmax')  
            bndbox.appendChild(xmax)  
            xmax_txt = doc.createTextNode(str(bbox[2]))
            xmax.appendChild(xmax_txt)  
        
            ymax = doc.createElement('ymax')  
            bndbox.appendChild(ymax)  
            ymax_txt = doc.createTextNode(str(bbox[3]))
            ymax.appendChild(ymax_txt) 
        else:          
            x0 = doc.createElement('x0')  
            bndbox.appendChild(x0)  
            x0_txt = doc.createTextNode(str(bbox[0]))
            x0.appendChild(x0_txt)  
      
            y0 = doc.createElement('y0')  
            bndbox.appendChild(y0)  
            y0_txt = doc.createTextNode(str(bbox[1]))
            y0.appendChild(y0_txt)    
      
            x1 = doc.createElement('x1')  
            bndbox.appendChild(x1)  
            x1_txt = doc.createTextNode(str(bbox[2]))
            x1.appendChild(x1_txt)  
      
            y1 = doc.createElement('y1')  
            bndbox.appendChild(y1)  
            y1_txt = doc.createTextNode(str(bbox[3]))
            y1.appendChild(y1_txt) 
            
            x2 = doc.createElement('x2')  
            bndbox.appendChild(x2)  
            x2_txt = doc.createTextNode(str(bbox[4]))
            x2.appendChild(x2_txt)  
      
            y2 = doc.createElement('y2')  
            bndbox.appendChild(y2)  
            y2_txt = doc.createTextNode(str(bbox[5]))
            y2.appendChild(y2_txt)
     
            x3 = doc.createElement('x3')  
            bndbox.appendChild(x3)  
            x3_txt = doc.createTextNode(str(bbox[6]))
            x3.appendChild(x3_txt)  
      
            y3 = doc.createElement('y3')  
            bndbox.appendChild(y3)  
            y3_txt = doc.createTextNode(str(bbox[7]))
            y3.appendChild(y3_txt)
    
    xmlname = os.path.splitext(imgname)[0]  
    tempfile = os.path.join(tmp ,xmlname+'.xml')
    with open(tempfile, 'wb') as f:
        f.write(doc.toprettyxml(indent='\t', encoding='utf-8'))
    return  
  
 
 
if __name__ == '__main__':
    data_path = '/home/yantianwang/lala/ship/train/examplesplit'
    images_path = os.path.join(data_path, 'images') #样本图片路径
    labeltxt_path = os.path.join(data_path, 'labelTxt') #DOTA标签的所在路径
    anno_new_path = os.path.join(data_path, 'obbxml')  #新的voc格式存储位置（hbb形式）
    ext = '.tif'  #样本图片的后缀
    filenames=os.listdir(labeltxt_path)    #获取每一个txt的名称   
    for filename in filenames:    
        filepath=labeltxt_path + '/'+filename    #每一个DOTA标签的具体路径
        picname = os.path.splitext(filename)[0] + ext  
        pic_path = os.path.join(images_path, picname)   
        im= cv2.imread(pic_path)            #读取相应的图片               
        (H,W,D) = im.shape                  #返回样本的大小
        boxes = readlabeltxt(filepath, H, W, hbb = True)           #默认是矩形（hbb）得到gt
        if len(boxes)==0:
            print('文件为空',filepath)
        #读取对应的样本图片，得到H,W,D用于书写xml
 
        #书写xml
        writeXml(anno_new_path, picname, W, H, D, boxes, hbb = True)
        print('正在处理%s'%filename)