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Python 讀取xml數(shù)據(jù),cv2裁剪圖片實(shí)例

更新時(shí)間：2020年03月10日 09:55:46 作者：竹子熊貓

這篇文章主要介紹了Python 讀取xml數(shù)據(jù),cv2裁剪圖片實(shí)例，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。一起跟隨小編過(guò)來(lái)看看吧

下載的數(shù)據(jù)是pascal voc2012的數(shù)據(jù)，已經(jīng)有annotation了，不過(guò)是xml格式的，訓(xùn)練的模型是在Google模型的基礎(chǔ)上加了兩層網(wǎng)絡(luò)，因此要在原始圖像中裁剪出用于訓(xùn)練的部分圖像。

另外，在原來(lái)給的標(biāo)注框的基礎(chǔ)上，做了點(diǎn)框的移動(dòng)。最后同類目標(biāo)存儲(chǔ)在同一文件夾中。

from __future__ import division
import os
from PIL import Image
import xml.dom.minidom
import numpy as np
 
ImgPath = 'C:/Users/Desktop/XML_try/img/' 
AnnoPath = 'C:/Users/Desktop/XML_try/xml/'
ProcessedPath = 'C:/Users/Desktop/CropedVOC/'
 
imagelist = os.listdir(ImgPath)
for image in imagelist:
	image_pre, ext = os.path.splitext(image)
	imgfile = ImgPath + image 
	xmlfile = AnnoPath + image_pre + '.xml'
	
	DomTree = xml.dom.minidom.parse(xmlfile)
	annotation = DomTree.documentElement
 
	filenamelist = annotation.getElementsByTagName('filename') #[<DOM Element: filename at 0x381f788>]
	filename = filenamelist[0].childNodes[0].data
	objectlist = annotation.getElementsByTagName('object')
	
	i = 1
	for objects in objectlist:
		
		namelist = objects.getElementsByTagName('name')
		objectname = namelist[0].childNodes[0].data
 
		savepath = ProcessedPath + objectname
 
		if not os.path.exists(savepath):
			os.makedirs(savepath)
 
		bndbox = objects.getElementsByTagName('bndbox')
		cropboxes = []
 
		for box in bndbox:
			x1_list = box.getElementsByTagName('xmin')
			x1 = int(x1_list[0].childNodes[0].data)
			y1_list = box.getElementsByTagName('ymin')
			y1 = int(y1_list[0].childNodes[0].data)
			x2_list = box.getElementsByTagName('xmax')
			x2 = int(x2_list[0].childNodes[0].data)
			y2_list = box.getElementsByTagName('ymax')
			y2 = int(y2_list[0].childNodes[0].data)
 
			w = x2 - x1
			h = y2 - y1
 
			obj = np.array([x1,y1,x2,y2])
			shift = np.array([[0.8,0.8,1.2,1.2],[0.9,0.9,1.1,1.1],[1,1,1,1],[0.7,0.7,1,1],[1,1,1.2,1.2],\
				[0.7,1,1,1.2],[1,0.7,1.2,1],[(x1+w*1/3)/x1,(y1+h*1/3)/y1,(x2+w*1/3)/x2,(y2+h*1/3)/y2],\
				[(x1-w*1/3)/x1,(y1-h*1/3)/y1,(x2-w*1/3)/x2,(y2-h*1/3)/y2]])
 
			XYmatrix = np.tile(obj,(9,1)) 
			cropboxes = XYmatrix * shift
 
			img = Image.open(imgfile)
			for cropbox in cropboxes:
				cropedimg = img.crop(cropbox)
				cropedimg.save(savepath + '/' + image_pre + '_' + str(i) + '.jpg')
				i += 1

補(bǔ)充知識(shí)：python-----截取xml文件畫(huà)框的圖片并保存

from __future__ import division
import os
from PIL import Image
import xml.dom.minidom
import numpy as np
ImgPath = r'D:\tmp\video_wang_mod\01\00022_8253_0021_3\output/'
AnnoPath = r'D:\tmp\video_wang_mod\01\00022_8253_0021_3\Annotations/'
ProcessedPath = r'D:\tmp\video_wang_mod\01\00022_8253_0021_3\cut/'

imagelist = os.listdir(ImgPath)

for image in imagelist:
  image_pre, ext = os.path.splitext(image)
  imgfile = ImgPath + image
  print(imgfile)
  if not os.path.exists(AnnoPath + image_pre + '.xml' ):
    continue
  xmlfile = AnnoPath + image_pre + '.xml'
  DomTree = xml.dom.minidom.parse(xmlfile)
  annotation = DomTree.documentElement
  filenamelist = annotation.getElementsByTagName('filename')
  filename = filenamelist[0].childNodes[0].data
  objectlist = annotation.getElementsByTagName('object')
  i = 1
  for objects in objectlist:
    namelist = objects.getElementsByTagName('name')
    objectname = namelist[0].childNodes[0].data
    savepath = ProcessedPath + objectname
    if not os.path.exists(savepath):
      os.makedirs(savepath)
    bndbox = objects.getElementsByTagName('bndbox')
    cropboxes = []
    for box in bndbox:
      x1_list = box.getElementsByTagName('xmin')
      x1 = int(x1_list[0].childNodes[0].data)
      y1_list = box.getElementsByTagName('ymin')
      y1 = int(y1_list[0].childNodes[0].data)
      x2_list = box.getElementsByTagName('xmax')
      x2 = int(x2_list[0].childNodes[0].data)
      y2_list = box.getElementsByTagName('ymax')
      y2 = int(y2_list[0].childNodes[0].data)
      w = x2 - x1
      h = y2 - y1
      obj = np.array([x1,y1,x2,y2])
      shift = np.array([[1,1,1,1]])
      XYmatrix = np.tile(obj,(1,1))
      cropboxes = XYmatrix * shift
      img = Image.open(imgfile)
      for cropbox in cropboxes:
        cropedimg = img.crop(cropbox)
        cropedimg.save(savepath + '/' + image_pre + '_' + str(i) + '.jpg')
        i += 1

以上這篇Python 讀取xml數(shù)據(jù),cv2裁剪圖片實(shí)例就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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