在图片上画出标注目标框和类别python程序，还是比较简单的，直接上一份代码：

#!/usr/bin/python
# -*- coding: UTF-8 -*-
# 2018/07/11 by DQ

import cv2
import os 
try:
    import xml.etree.cElementTree as ET
except ImportError:
    import xml.etree.ElementTree as ET

ImSize=[600,338]
PreImNum=10000
fileIdLen=6
ImExpName='.jpg'
AnotExpName='.xml'
ImIdSet=range(1,PreImNum+1)

#data file 
MainFolder='/home/Ok/MyData'
ImFolder=os.path.join(MainFolder,'JPEGImages')
AnotFolder=os.path.join(MainFolder,'Annotations')

##get object annotation bndbox loc start 
def GetAnnotBoxLoc(AnotPath):
    #open xml 
    tree = ET.ElementTree(file=AnotPath)
    root = tree.getroot()
    ObjectSet=root.findall('object')
    ObjBndBoxSet={}
    for Object in ObjectSet:
        ObjName=Object.find('name').text
        BndBox=Object.find('bndbox')
        x1 = int(BndBox.find('xmin').text)-1
        y1 = int(BndBox.find('ymin').text)-1
        x2 = int(BndBox.find('xmax').text)-1
        y2 = int(BndBox.find('ymax').text)-1
        BndBoxLoc=[x1,y1,x2,y2]
        if ObjBndBoxSet.has_key(ObjName):
            ObjBndBoxSet[ObjName].append(BndBoxLoc)
        else:
            ObjBndBoxSet[ObjName]=[BndBoxLoc]#why not ues dict(key=val)?
    return ObjBndBoxSet
##get object annotation bndbox loc end

##draw all bndbox on image
def DrawObjectBox(Im,ObjBndBoxSet,BoxColor):
    for ObjName,BndBoxSet in ObjBndBoxSet.iteritems():
        for BndBox in BndBoxSet:  
            cv2.rectangle(Im,(BndBox[0],BndBox[1]),(BndBox[2],BndBox[3]),BoxColor,2)
            dsptxt='{:s}'.format(ObjName)
            cv2.putText(Im,dsptxt,(max([(BndBox[0]+BndBox[2])/2-10,0]), max([BndBox[3]-3,0])),cv2.FONT_HERSHEY_COMPLEX,1,(0,0,255),1)



for ImId in ImIdSet:
    ImIdStr=str(ImId).zfill(fileIdLen)
    ImName=ImIdStr+ImExpName
    ImPath=os.path.join(ImFolder,ImName)
    Im = cv2.imread(ImPath,1)
    #print ImName
    AnotName=ImIdStr+AnotExpName
    AnotPath=os.path.join(AnotFolder,AnotName)
    ObjBndBoxSet=GetAnnotBoxLoc(AnotPath)
    print str(ObjBndBoxSet)
    DrawObjectBox(Im,ObjBndBoxSet,(255,0,0))
    cv2.imshow('OriginIm',Im)    

    cv2.waitKey(2000)
    cv2.destroyAllWindows()