目录
labelimg标注工具怎么安装和使用在我的博客中已经讲解了,有需要可以看看,博客。
1.1 voc格式
VOC格式文件保存在和图像名称一样的xml文件中,xml文件中的标注信息如下图所示:文中红色框中保存着标注图片的主要信息。第一个红色框中里面显示着图片的保存在哪个文件夹中,标签对应的图片名称,还有图片保存的绝对路径。第二个红色框中的信息为标签图片的大小尺寸和通道,正常都是3通道。第三个红色框中的信息为图中标注的对象的信息,分别为该目标对象的属于哪一类,可以看出该对象名称为boat,然后还有标注框的两个点,分别为框的起始点和终结点。第四个红色框中的信息和第三个框框一样,都是我们标注对象的信息,不过该对象为cat。
1.2 yolo数据格式介绍
yolo数据格式,是把每个图片的标注信息保存在一个和图片名称一样的txt文件中。txt文件中的信息如下图所示:
0 0.47416020671834624 0.4523809523809524 0.5968992248062015 0.6839826839826841 0.874031007751938 0.4069264069264069 0.1227390180878553 0.2727272727272727
每一行代表标注的一个目标,第一个数字代表着这个数的类别,第一类目标就是0,第二类目标就是1,以此类推。后面的四个数字是归一化后的的标注的中心点坐标和归一化标注框的长和宽。
2.1 voc转yolo代码
import xml.etree.ElementTree as ETimport pickleimport osfrom os import listdir, getcwdfrom os.path import joindef convert(size, box): x_center = (box[0] + box[1]) / 2.0 y_center = (box[2] + box[3]) / 2.0 x = x_center / size[0] y = y_center / size[1] w = (box[1] - box[0]) / size[0] h = (box[3] - box[2]) / size[1] return (x, y, w, h)def convert_annotation(xml_files_path, save_txt_files_path, classes): xml_files = os.listdir(xml_files_path) print(xml_files) for xml_name in xml_files: print(xml_name) xml_file = os.path.join(xml_files_path, xml_name) out_txt_path = os.path.join(save_txt_files_path, xml_name.split('.')[0] + '.txt') out_txt_f = open(out_txt_path, 'w') tree = ET.parse(xml_file) root = tree.getroot() size = root.find('size') w = int(size.find('width').text) h = int(size.find('height').text) 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)) # b=(xmin, xmax, ymin, ymax) print(w, h, b) bb = convert((w, h), b) out_txt_f.write(str(cls_id) + " " + " ".join([str(a) for a in bb]) + '\n')if __name__ == "__main__": # 需要转换的类别,需要一一对应 classes1 = ['boat', 'cat'] # 2、voc格式的xml标签文件路径 xml_files1 = r'C:\Users\86159\Desktop\VOC2007\Annotations' # 3、转化为yolo格式的txt标签文件存储路径 save_txt_files1 = r'C:\Users\86159\Desktop\VOC2007\label' convert_annotation(xml_files1, save_txt_files1, classes1)
需要注意的是一定要将自己的类别名字写对,对应好,否则会出错。
2.2 yolo转voc格式代码
from xml.dom.minidom import Documentimport osimport cv2# def makexml(txtPath, xmlPath, picPath): # txt所在文件夹路径,xml文件保存路径,图片所在文件夹路径def makexml(picPath, txtPath, xmlPath): # txt所在文件夹路径,xml文件保存路径,图片所在文件夹路径 """此函数用于将yolo格式txt标注文件转换为voc格式xml标注文件 在自己的标注图片文件夹下建三个子文件夹,分别命名为picture、txt、xml """ dic = {'0': "boat", # 创建字典用来对类型进行转换 '1': "cat", # 此处的字典要与自己的classes.txt文件中的类对应,且顺序要一致 } files = os.listdir(txtPath) for i, name in enumerate(files): xmlBuilder = Document() annotation = xmlBuilder.createElement("annotation") # 创建annotation标签 xmlBuilder.appendChild(annotation) txtFile = open(txtPath + name) txtList = txtFile.readlines() img = cv2.imread(picPath + name[0:-4] + ".jpg") Pheight, Pwidth, Pdepth = img.shape folder = xmlBuilder.createElement("folder") # folder标签 foldercontent = xmlBuilder.createTextNode("driving_annotation_dataset") folder.appendChild(foldercontent) annotation.appendChild(folder) # folder标签结束 filename = xmlBuilder.createElement("filename") # filename标签 filenamecontent = xmlBuilder.createTextNode(name[0:-4] + ".jpg") filename.appendChild(filenamecontent) annotation.appendChild(filename) # filename标签结束 size = xmlBuilder.createElement("size") # size标签 width = xmlBuilder.createElement("width") # size子标签width widthcontent = xmlBuilder.createTextNode(str(Pwidth)) width.appendChild(widthcontent) size.appendChild(width) # size子标签width结束 height = xmlBuilder.createElement("height") # size子标签height heightcontent = xmlBuilder.createTextNode(str(Pheight)) height.appendChild(heightcontent) size.appendChild(height) # size子标签height结束 depth = xmlBuilder.createElement("depth") # size子标签depth depthcontent = xmlBuilder.createTextNode(str(Pdepth)) depth.appendChild(depthcontent) size.appendChild(depth) # size子标签depth结束 annotation.appendChild(size) # size标签结束 for j in txtList: oneline = j.strip().split(" ") object = xmlBuilder.createElement("object") # object 标签 picname = xmlBuilder.createElement("name") # name标签 namecontent = xmlBuilder.createTextNode(dic[oneline[0]]) picname.appendChild(namecontent) object.appendChild(picname) # name标签结束 pose = xmlBuilder.createElement("pose") # pose标签 posecontent = xmlBuilder.createTextNode("Unspecified") pose.appendChild(posecontent) object.appendChild(pose) # pose标签结束 truncated = xmlBuilder.createElement("truncated") # truncated标签 truncatedContent = xmlBuilder.createTextNode("0") truncated.appendChild(truncatedContent) object.appendChild(truncated) # truncated标签结束 difficult = xmlBuilder.createElement("difficult") # difficult标签 difficultcontent = xmlBuilder.createTextNode("0") difficult.appendChild(difficultcontent) object.appendChild(difficult) # difficult标签结束 bndbox = xmlBuilder.createElement("bndbox") # bndbox标签 xmin = xmlBuilder.createElement("xmin") # xmin标签 mathData = int(((float(oneline[1])) * Pwidth + 1) - (float(oneline[3])) * 0.5 * Pwidth) xminContent = xmlBuilder.createTextNode(str(mathData)) xmin.appendChild(xminContent) bndbox.appendChild(xmin) # xmin标签结束 ymin = xmlBuilder.createElement("ymin") # ymin标签 mathData = int(((float(oneline[2])) * Pheight + 1) - (float(oneline[4])) * 0.5 * Pheight) yminContent = xmlBuilder.createTextNode(str(mathData)) ymin.appendChild(yminContent) bndbox.appendChild(ymin) # ymin标签结束 xmax = xmlBuilder.createElement("xmax") # xmax标签 mathData = int(((float(oneline[1])) * Pwidth + 1) + (float(oneline[3])) * 0.5 * Pwidth) xmaxContent = xmlBuilder.createTextNode(str(mathData)) xmax.appendChild(xmaxContent) bndbox.appendChild(xmax) # xmax标签结束 ymax = xmlBuilder.createElement("ymax") # ymax标签 mathData = int(((float(oneline[2])) * Pheight + 1) + (float(oneline[4])) * 0.5 * Pheight) ymaxContent = xmlBuilder.createTextNode(str(mathData)) ymax.appendChild(ymaxContent) bndbox.appendChild(ymax) # ymax标签结束 object.appendChild(bndbox) # bndbox标签结束 annotation.appendChild(object) # object标签结束 f = open(xmlPath + name[0:-4] + ".xml", 'w') xmlBuilder.writexml(f, indent='\t', newl='\n', addindent='\t', encoding='utf-8') f.close()if __name__ == "__main__": picPath = "C:/Users/86159/Desktop/VOC2007/JPEGImage/" # 图片所在文件夹路径,后面的/一定要带上 txtPath = "C:/Users/86159/Desktop/VOC2007/yolo/" # txt所在文件夹路径,后面的/一定要带上 xmlPath = "C:/Users/86159/Desktop/VOC2007/Annotations1/" # xml文件保存路径,后面的/一定要带上 makexml(picPath, txtPath, xmlPath)
需注要意的是一定要将类别和名字对应好
来源地址:https://blog.csdn.net/didiaopao/article/details/119910139