Yolo系列学习1-Yolov3训练自己的数据

前提:

可运行的yolov3环境,环境搭建见官网https://pjreddie.com/darknet/yolo/

目的:

实现利用yolov3训练自己的数据集(voc格式)

方法:

1)构建VOC数据集

  • 将你手中的数据集的标注txt修改成voc格式的txt,voc格式如下:
000002.jpg car 44 28 132 121  
000003.jpg car 54 19 243 178  
000004.jpg car 168 6 298 164  

其中第一列为图片名,第二列为目标类别,最后是目标的包围框坐标(左上角和右下角坐标)。

批量修改文件名python代码:

pic_path = "D:/VOCdevkit/VOC2007/JPEGImages/"
piclist = os.listdir(pic_path)
total_num = len(piclist)
i = 1
for pic in piclist:
    if pic.endswith(".jpg"):
        old_path = os.path.join(os.path.abspath(pic_path), pic)
        new_path = os.path.join(os.path.abspath(pic_path), '000' + format(str(i), '0>5') + '.jpg')
        os.renames(old_path, new_path)
        i = i + 1

批量合并文件夹内所有txt文件python代码:

import os
filedir = "D:/DET/"
filenames=os.listdir(filedir)
f=open('train.txt','w')
for filename in filenames:
    filepath = filedir+'/'+filename
    for line in open(filepath):
        f.writelines(line)
f.close()
  • 将该train.txt转换成voc数据所需要的xml,matlab代码如下:

clc;
clear;

imgpath='D:/VOCdevkit/VOC2007/JPEGImages/';%图像存放文件夹
txtpath='D:/train.txt';%txt文件
xmlpath_new='D:/VOCdevkit/VOC2007/Annotations/';%修改后的xml保存文件夹
foldername='JPEGImages';
path='/home/zhangzhi/darknet/scripts/VOCdevkit/VOC2007/JPEGImages/';


fidin=fopen(txtpath,'r');
lastname='begin';

while ~feof(fidin)
     tline=fgetl(fidin);
     str = regexp(tline, ' ','split');
     filepath=[imgpath,str{1}];
     ppath=[path,str{1}];
     img=imread(filepath);
     [h,w,d]=size(img);
%      imshow(img);
%      rectangle('Position',[str2double(str{3}),str2double(str{4}),str2double(str{5})-str2double(str{3}),str2double(str{6})-str2double(str{4})],'LineWidth',4,'EdgeColor','r');
      pause(0.1);
      
        if strcmp(str{1},lastname)%如果文件名相等,只需增加object
           object_node=Createnode.createElement('object');
           Root.appendChild(object_node);
           node=Createnode.createElement('name');
           node.appendChild(Createnode.createTextNode(sprintf('%s',str{2})));
           object_node.appendChild(node);
          
           node=Createnode.createElement('pose');
           node.appendChild(Createnode.createTextNode(sprintf('%s','Unspecified')));
           object_node.appendChild(node);
          
           node=Createnode.createElement('truncated');
           node.appendChild(Createnode.createTextNode(sprintf('%s','0')));
           object_node.appendChild(node);

           node=Createnode.createElement('difficult');
           node.appendChild(Createnode.createTextNode(sprintf('%s','0')));
           object_node.appendChild(node);
          
           bndbox_node=Createnode.createElement('bndbox');
           object_node.appendChild(bndbox_node);

           node=Createnode.createElement('xmin');
           node.appendChild(Createnode.createTextNode(sprintf('%s',num2str(str{3}))));
           bndbox_node.appendChild(node);

           node=Createnode.createElement('ymin');
           node.appendChild(Createnode.createTextNode(sprintf('%s',num2str(str{4}))));
           bndbox_node.appendChild(node);

           node=Createnode.createElement('xmax');
           node.appendChild(Createnode.createTextNode(sprintf('%s',num2str(str{5}))));
           bndbox_node.appendChild(node);

           node=Createnode.createElement('ymax');
           node.appendChild(Createnode.createTextNode(sprintf('%s',num2str(str{6}))));
           bndbox_node.appendChild(node);
        else 
           copyfile(filepath, 'JPEGImages');

           if exist('Createnode','var')
              tempname=lastname;
              tempname=strrep(tempname,'.jpg','.xml');
              xmlwrite(tempname,Createnode);   
           end
            
            
            Createnode=com.mathworks.xml.XMLUtils.createDocument('annotation');
            Root=Createnode.getDocumentElement;
            node=Createnode.createElement('folder');
            node.appendChild(Createnode.createTextNode(sprintf('%s',foldername)));
            Root.appendChild(node);
            node=Createnode.createElement('filename');
            node.appendChild(Createnode.createTextNode(sprintf('%s',str{1})));
            Root.appendChild(node);
            node=Createnode.createElement('path');
            node.appendChild(Createnode.createTextNode(sprintf('%s',ppath)));
            Root.appendChild(node);
            source_node=Createnode.createElement('source');
            Root.appendChild(source_node);
            node=Createnode.createElement('database');
            node.appendChild(Createnode.createTextNode(sprintf('My Database')));
            source_node.appendChild(node);

           size_node=Createnode.createElement('size');
           Root.appendChild(size_node);

          node=Createnode.createElement('width');
          node.appendChild(Createnode.createTextNode(sprintf('%s',num2str(w))));
          size_node.appendChild(node);

          node=Createnode.createElement('height');
          node.appendChild(Createnode.createTextNode(sprintf('%s',num2str(h))));
          size_node.appendChild(node);

         node=Createnode.createElement('depth');
         node.appendChild(Createnode.createTextNode(sprintf('%s',num2str(d))));
         size_node.appendChild(node);
         
          node=Createnode.createElement('segmented');
          node.appendChild(Createnode.createTextNode(sprintf('%s','0')));
          Root.appendChild(node);
          object_node=Createnode.createElement('object');
          Root.appendChild(object_node);
          node=Createnode.createElement('name');
          node.appendChild(Createnode.createTextNode(sprintf('%s',str{2})));
          object_node.appendChild(node);
          
          node=Createnode.createElement('pose');
          node.appendChild(Createnode.createTextNode(sprintf('%s','Unspecified')));
          object_node.appendChild(node);
          
          node=Createnode.createElement('truncated');
          node.appendChild(Createnode.createTextNode(sprintf('%s','0')));
          object_node.appendChild(node);

          node=Createnode.createElement('difficult');
          node.appendChild(Createnode.createTextNode(sprintf('%s','0')));
          object_node.appendChild(node);
          
          bndbox_node=Createnode.createElement('bndbox');
          object_node.appendChild(bndbox_node);

         node=Createnode.createElement('xmin');
         node.appendChild(Createnode.createTextNode(sprintf('%s',num2str(str{3}))));
         bndbox_node.appendChild(node);

         node=Createnode.createElement('ymin');
         node.appendChild(Createnode.createTextNode(sprintf('%s',num2str(str{4}))));
         bndbox_node.appendChild(node);

        node=Createnode.createElement('xmax');
        node.appendChild(Createnode.createTextNode(sprintf('%s',num2str(str{5}))));
        bndbox_node.appendChild(node);

        node=Createnode.createElement('ymax');
        node.appendChild(Createnode.createTextNode(sprintf('%s',num2str(str{6}))));
        bndbox_node.appendChild(node);
       
       lastname=str{1};
        end
        if feof(fidin)
            tempname=lastname;
            tempname=strrep(tempname,'.jpg','.xml');
            xmlwrite(tempname,Createnode);
        end
end
fclose(fidin);

file=dir(pwd);
for i=1:length(file)
   if length(file(i).name)>=4 && strcmp(file(i).name(end-3:end),'.xml')
    fold=fopen(file(i).name,'r');
    fnew=fopen([xmlpath_new file(i).name],'w');
    line=1;
    while ~feof(fold)
        tline=fgetl(fold);
        if line==1
           line=2;
           continue;
        end
        expression = '   ';
        replace=char(9);
        newStr=regexprep(tline,expression,replace);
        fprintf(fnew,'%s\n',newStr);
    end
    fprintf('已处理%s\n',file(i).name);
    fclose(fold);
    fclose(fnew);
    delete(file(i).name);
   end
end
生成的xml如下所示
<annotation>
	<folder>JPEGImages</folder>
	<filename>00000000.jpg</filename>
	<path>/home/zhangzhi/darknet/scripts/VOCdevkit/VOC2007/JPEGImages/00000000.jpg</path>
	<source>
		<database>My Database</database>
	</source>
	<size>
		<width>512</width>
		<height>512</height>
		<depth>3</depth>
	</size>
	<segmented>0</segmented>
	<object>
		<name>car</name>
		<pose>Unspecified</pose>
		<truncated>0</truncated>
		<difficult>0</difficult>
		<bndbox>
			<xmin>277</xmin>
			<ymin>498</ymin>
			<xmax>304</xmax>
			<ymax>511</ymax>
		</bndbox>
	</object>
</annotation>
  • 生成Main中的四个txt(train.txt,val.txt,test.txt,trainval.txt)

txt的内容为没有后缀名的图片名称:

000005  
000027  
000028  
000033  
000042  
000045  
000048  
000058  

即图片名字(无后缀),test.txt是测试集,train.txt是训练集,val.txt是验证集,trainval.txt是训练和验证集。VOC2007中,trainval大概是整个数据集的50%,test也大概是整个数据集的50%;train大概是trainval的50%,val大概是trainval的50%。可参考以下代码:

%%  
%该代码根据已生成的xml,制作VOC2007数据集中的trainval.txt;train.txt;test.txt和val.txt  
%trainval占总数据集的50%,test占总数据集的50%;train占trainval的50%,val占trainval的50%;  
%上面所占百分比可根据自己的数据集修改,如果数据集比较少,test和val可少一些  
%注意修改下面四个值  
xmlfilepath='F:/VOCdevkit/VOC2007/Annotations/';  
txtsavepath='F:/VOCdevkit/VOC2007/ImageSets/Main/;  
trainval_percent=0.5;%trainval占整个数据集的百分比,剩下部分就是test所占百分比  
train_percent=0.5;%train占trainval的百分比,剩下部分就是val所占百分比  
      
      
%%  
xmlfile=dir(xmlfilepath);  
numOfxml=length(xmlfile)-2;%减去.和..  总的数据集大小  
      
      
trainval=sort(randperm(numOfxml,floor(numOfxml*trainval_percent)));  
test=sort(setdiff(1:numOfxml,trainval));  
      
      
trainvalsize=length(trainval);%trainval的大小  
train=sort(trainval(randperm(trainvalsize,floor(trainvalsize*train_percent))));  
val=sort(setdiff(trainval,train));  
      
      
ftrainval=fopen([txtsavepath 'trainval.txt'],'w');  
ftest=fopen([txtsavepath 'test.txt'],'w');  
ftrain=fopen([txtsavepath 'train.txt'],'w');  
fval=fopen([txtsavepath 'val.txt'],'w');  
      
      
for i=1:numOfxml  
    if ismember(i,trainval)  
        fprintf(ftrainval,'%s\n',xmlfile(i+2).name(1:end-4));  
            if ismember(i,train)  
                fprintf(ftrain,'%s\n',xmlfile(i+2).name(1:end-4));  
            else  
                fprintf(fval,'%s\n',xmlfile(i+2).name(1:end-4));  
            end  
    else  
        fprintf(ftest,'%s\n',xmlfile(i+2).name(1:end-4));  
    end  
end  
fclose(ftrainval);  
fclose(ftrain);  
fclose(fval);  
fclose(ftest);  
  • 整合文件

       新建立一个VOC2007文件夹,在该文件夹下面新建JPEGImages,Annotations,labels,ImageSets文件夹,将所有训练的图片均放置在JPEGImages文件夹下,将第二步生成的xml文件放置在Annotations文件夹中,在ImageSets下新建Main文件夹,将第三步生成的四个txt放入其中,将下面步骤生成的文件放置于labels文件夹中

  • 上面步骤的代码均是在Windows下使用,下面代码在Ubuntu下使用。生成labels文件:
import xml.etree.ElementTree as ET
import pickle
import os
from os import listdir, getcwd
from os.path import join

#修改
#sets=[('2012', 'train'), ('2012', 'val'), ('2007', 'train'), ('2007', 'val'), ('2007', 'test')]
sets=[('2007', 'train'), ('2007', 'val'), ('2007', 'test')]

#修改
classes = ["aeroplane", "bicycle", "bird", "boat", "bottle", "bus", "car", "cat", "chair", "cow", "diningtable", "dog", "horse", "motorbike", "person", "pottedplant", "sheep", "sofa", "train", "tvmonitor"]
classes = ["car", "van", "truck ", "bus"]

def convert(size, box):
    dw = 1./size[0]
    dh = 1./size[1]
    x = (box[0] + box[1])/2.0
    y = (box[2] + box[3])/2.0
    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(year, image_id):
    in_file = open('VOCdevkit/VOC%s/Annotations/%s.xml'%(year, image_id))
    out_file = open('VOCdevkit/VOC%s/labels/%s.txt'%(year, image_id), 'w')
    tree=ET.parse(in_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))
        bb = convert((w,h), b)
        out_file.write(str(cls_id) + " " + " ".join([str(a) for a in bb]) + '\n')

wd = getcwd()

for year, image_set in sets:
    if not os.path.exists('VOCdevkit/VOC%s/labels/'%(year)):
        os.makedirs('VOCdevkit/VOC%s/labels/'%(year))
    image_ids = open('VOCdevkit/VOC%s/ImageSets/Main/%s.txt'%(year, image_set)).read().strip().split()
    list_file = open('%s_%s.txt'%(year, image_set), 'w')
    for image_id in image_ids:
        list_file.write('%s/VOCdevkit/VOC%s/JPEGImages/%s.jpg\n'%(wd, year, image_id))
        convert_annotation(year, image_id)
    list_file.close()

#如果需要用train和val的数据一起用来训练,合并文件:
 os.system("cat 2007_train.txt 2007_val.txt > train.txt")
 os.system("cat 2007_train.txt 2007_val.txt 2007_test.txt > train.all.txt")

2)修改yolov3的相关文件

  • 修改cfg/voc.data文件,进行如下修改:
classes= 4  # 自己数据集的类别数  
train  = /home/zhangzhi/darknet/VOCdevkit/2007_train.txt  # train文件的路径  
valid  = /home/zhangzhi/darknet/VOCdevkit/2007_test.txt   # test文件的路径  
names = data/voc.names  
backup = backup  
  • 修改data/voc.names文件,对应自己的数据集修改类别。
car
van
truck
bus
  • 下载Imagenet上预先训练的权重
wget https://pjreddie.com/media/files/darknet53.conv.74 
  • 修改cfg/yolov3-voc.cfg

找到文件中类似的部分进行修改,共有3处:

[convolutional]
size=1
stride=1
pad=1
filters=27
activation=linear

[yolo]
mask = 0,1,2
anchors = 10,13,  16,30,  33,23,  30,61,  62,45,  59,119,  116,90,  156,198,  373,326
classes=4
num=9
jitter=.3
ignore_thresh = .5
truth_thresh = 1
random=1
filters=27 
activation=linear 

[yolo] 
mask = 0,1,2 
anchors = 10,13, 16,30, 33,23, 30,61, 62,45, 59,119, 116,90, 156,198, 373,326 
classes=4 
num=9 
jitter=.3 
ignore_thresh = .5 
truth_thresh = 1 
random=1

需要改变filters为num/3*(classes+1+4),即3*(classes+1+4),参考https://github.com/pjreddie/darknet/issues/582,同时需要修改下面的classes的种类。

3)训练,测试

./darknet detector train cfg/voc.data cfg/yolov3-voc.cfg darknet53.conv.74  
./darknet detector test cfg/voc.data cfg/yolov3-voc.cfg backup/yolov3-voc_final.weights data/dog.jpg

参考:

https://blog.csdn.net/sinat_30071459/article/details/50723212

https://blog.csdn.net/helloworld1213800/article/details/79749359

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