VOC2012数据集提取自己需要的类的图片和对应的xml标签

import os
import os.path
import shutil
 
fileDir_ann = r‘/home/somnus/tttt/VOC2012/Annotations/‘
fileDir_img = r‘/home/somnus/tttt/VOC2012/JPEGImages/‘

#存放包含需要的类的图片
saveDir_img = r‘/home/somnus/tttt/VOC2012/JPEGImages_ssd/‘
       
if not os.path.exists(saveDir_img):
    os.mkdir(saveDir_img)

#返回局部名字空间的拷贝
names = locals()

for files in os.walk(fileDir_ann):
    #遍历Annotations中的所有文件
    for file in files[2]:
        print file + "-->start!"

        #存放包含需要的类的图片对应的xml文件
        saveDir_ann = r‘/home/somnus/tttt/VOC2012/Annotations_ssd/‘ 

        if not os.path.exists(saveDir_ann):
            os.mkdir(saveDir_ann)
        fp = open(fileDir_ann + file)        
        saveDir_ann = saveDir_ann + file
        fp_w = open(saveDir_ann, ‘w‘)
        classes = [‘aeroplane‘,‘bicycle‘,‘bird‘,‘boat‘,‘bottle‘,‘bus‘,‘car‘,‘cat‘,‘chair‘,‘cow‘,‘diningtable‘,                   ‘dog‘,‘horse‘,‘motorbike‘,‘pottedplant‘,‘sheep‘,‘sofa‘,‘train‘,‘tvmonitor‘,‘person‘]

        lines = fp.readlines()

        #记录所有的\t<object>\n的位置
        ind_start = []

        #记录所有的\t</object>\n的位置
        ind_end = []

        lines_id_start = lines[:]
        lines_id_end = lines[:]

        while "\t<object>\n" in lines_id_start:
            a = lines_id_start.index("\t<object>\n")
            ind_start.append(a)
            lines_id_start[a] = "delete"

        while "\t</object>\n" in lines_id_end:
            b = lines_id_end.index("\t</object>\n")
            ind_end.append(b)
            lines_id_end[b] = "delete"

        for k in range(0,len(ind_start)):
            for j in range(0,len(classes)):
                if classes[j] in lines[ind_start[k]+1]:
                    a = ind_start[k]
                    names[‘block%d‘%k] = [lines[a],lines[a+1],                                          lines[a+2],lines[a+3],lines[a+4],                                          lines[a+5],lines[a+6],lines[a+7],                                          lines[a+8],lines[a+9],lines[a+10],                                          lines[ind_end[k]]]
                    break
        #需要的类
        classes1 = ‘\t\t<name>boat</name>\n‘

        string_start = lines[0:ind_start[0]]
        string_end = lines[ind_end[-1] + 1:]

        a = 0
        for k in range(0,len(ind_start)):
            if classes1 in names[‘block%d‘%k]:
                a += 1
                string_start += names[‘block%d‘%k]

        string_start += string_end 
        for c in range(0,len(string_start)):
            fp_w.write(string_start[c])
        fp_w.close()

        if a == 0:
            os.remove(saveDir_ann)
        else:
            name_img = fileDir_img + os.path.splitext(file)[0] + ".jpg"
            shutil.copy(name_img,saveDir_img)
        fp.close()