因为训练的需要，我需要把图片进行上下翻转然后保存，同时也要修改标记文件，主要的任务就这样，这个操作过程还是不难，程序注解也比较详尽在此不赘述，直接见代码吧，因为实在sublime写的程序，不知怎么中文注解，写的时候使用chinese English 简单注解了下，有点英语基础的都能看的懂。

#!/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=[640,480]
PreImNum=10000
fileIdLen=6
ImExpName='.jpg'
AnotExpName='.xml'

# up-down flip image
def GetUDFlipLoc(ImSize,BndBox):
    H=ImSize[1]
    xmin=BndBox[0]
    ymin=BndBox[1]
    xmax=BndBox[2]
    ymax=BndBox[3]
    
    NewXmin=xmin
    NewYmin=H-ymax
    NewXmax=xmax
    NewYmax=H-ymin
    NewBndBox=[NewXmin,NewYmin,NewXmax,NewYmax]
    return NewBndBox

#draw all bndbox on image
def DrawObjectBox(Im,BndBoxSet,BoxColor):
	BoxNum=len(BndBoxSet)
	for i in range(BoxNum):
		BndBox=BndBoxSet[i]
		cv2.rectangle(Im,(BndBox[0],BndBox[1]),(BndBox[2],BndBox[3]),BoxColor,2)

#get flip image and xml file
def GetImAndXml(ImFolder,ImName,AnotFolder):
    BndBoxSet=[]
    NewBndBoxSet=[]
    ImPath=os.path.join(ImFolder,ImName)
    if os.path.isfile(ImPath):
        TempStr=ImName.split('.')
        AnotName=TempStr[0]+AnotExpName;
        AnotPath=os.path.join(AnotFolder,AnotName)
        

        #open xml 
        tree = ET.ElementTree(file=AnotPath)
        root = tree.getroot()
        #reset file name  for <filename>xxx.jpg</filename>
        filenameNode=root.find('filename')
        filename=filenameNode.text;
        #print filename
        SplitStr=filename.split('.')
        fileId=int(SplitStr[0])
        NewfileId=(str(fileId+PreImNum)).zfill(fileIdLen)
        #print fileId
        NewImName=NewfileId+'.jpg'
        filenameNode.text=NewImName

        #save up-down flip image
        Im = cv2.imread(ImPath,1)
        UDFlipIm=cv2.flip(Im,0)
        NewImPath=os.path.join(ImFolder,NewImName)
        cv2.imwrite(NewImPath,UDFlipIm)

        #reset bndbox for all object  
        for Child in root.iter('bndbox'):
            #print(Child.tag,":", Child.attrib)  
            BndBox=[]
            for SubChild in Child:
                #print(SubChild.tag, ":", SubChild.attrib,SubChild.text)
                BndBox.append(int(SubChild.text))
            #print BndBox
            NewBndBox=GetUDFlipLoc(ImSize,BndBox)
            #print NewBndBox
            i=0
            SubChild=None
            for SubChild in Child:
                SubChild.text=str(NewBndBox[i])
                i+=1
                
            BndBoxSet.append(BndBox)
            NewBndBoxSet.append(NewBndBox)

        #save the fix file  
        NewAnotName=NewfileId+AnotExpName  
        NewAnotPath=os.path.join(AnotFolder,NewAnotName)  
        tree.write(NewAnotPath)
    elif os.path.isdir(ImPath):
         print 'this is document'
    else:
         print 'unknown'
    return BndBoxSet,NewBndBoxSet

#data file 
MainFolder='/home/Ok/Data/Fan'
ImFolder=os.path.join(MainFolder,'JPEGImages')
AnotFolder=os.path.join(MainFolder,'Annotations')
IsShowBoxIm=False
#ImNameSet=os.listdir(ImFolder)
#for ImName in ImNameSet:
ImNum=PreImNum
for Id in range(ImNum):
    ImName=(str(Id+1)).zfill(fileIdLen)+ImExpName
    print ImName
    BndBoxSet,NewBndBoxSet=GetImAndXml(ImFolder,ImName,AnotFolder)
        

    if IsShowBoxIm:
        #imshow these image and box
        #print len(BndBoxSet)
        ImPath=os.path.join(ImFolder,ImName)
        Im = cv2.imread(ImPath,1)
        UDFlipIm=cv2.flip(Im,0)

        #original box 
        DrawObjectBox(Im,BndBoxSet,(255,0,0))
        cv2.imshow('OriginIm',Im)
        SplitStr=ImName.split('.') 
        OriginBoxName=SplitStr[0]+'_OrigBox.'+SplitStr[1]
        ImPath=os.path.join(MainFolder,'OriginBox',OriginBoxName)
        cv2.imwrite(ImPath,Im)

        #up-down flip box
        DrawObjectBox(UDFlipIm,NewBndBoxSet,(0,255,0))
        cv2.imshow('UDFlipIm',UDFlipIm)
        NewBoxName=SplitStr[0]+'_NewBox.'+SplitStr[1]
        ImPath=os.path.join(MainFolder,'NewBox',NewBoxName)
        cv2.imwrite(ImPath,UDFlipIm)

        cv2.waitKey(200)#这两句在sublime下不管用，不知道为啥？
        cv2.destroyAllWindows()