读取xml文件

xml文件常用于检测任务的标注，里面一般会包含bndox。

关于xml的其他信息可以参考：https://www.cnblogs.com/miniren/p/5092019.html

        import xml.dom.minidom
        
        #载入xml文件
        DomTree = xml.dom.minidom.parse(xmlfile)
        annotation = DomTree.documentElement
        
        # 获取全部的object，并且裁剪出该部分进行保存
        objectlist = annotation.getElementsByTagName('object')
        # 因为object有很多个，组成一个list
        for object in objectlist:
            # 下面这两句是得到该object的name，注意两个尖括号夹起来的都是str类型
            name = object.getElementsByTagName('name')
            name = name[0].childNodes[0].data
            bndbox = object.getElementsByTagName('bndbox')
            for box in bndbox:
                # 比如这个xmin标签加夹起来的数字也是一个str类型
                x1 = box.getElementsByTagName('xmin')
                x1 = int(x1[0].childNodes[0].data)
                y1 = box.getElementsByTagName('ymin')
                y1 = int(y1[0].childNodes[0].data)
                x2 = box.getElementsByTagName('xmax')
                x2 = int(x2[0].childNodes[0].data)
                y2 = box.getElementsByTagName('ymax')
                y2 = int(y2[0].childNodes[0].data)
                w = x2 - x1
                h = y2 - y1

                img = Image.open(imgfile)
                width, height = img.size
                minX = max(0, x1)
                minY = max(0, y1)
                maxX = min(x2, width)
                maxY = min(y2, height)
                cropbox = (minX, minY, maxX, maxY)
                cropedimg = img.crop(cropbox)
                cropedimg.save(os.path.join(ProcessedPath, id+'_'+name+ext))

下面是xml文件的举例：

<annotation verified="no">
  <folder>&#26126;&#22825;</folder>
  <filename>20190318113128797073_1_warp</filename>
  <path>E:&#26410;&#23436;&#25104;&#26126;&#22825;20190318113128797073_1_warp.jpg</path>
  <source>
    <database>Unknown</database>
  </source>
  <size>
    <width>594</width>
    <height>375</height>
    <depth>3</depth>
  </size>
  <segmented>0</segmented>
  <object>
    <name>name</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>118</xmin>
      <ymin>39</ymin>
      <xmax>198</xmax>
      <ymax>71</ymax>
    </bndbox>
  </object>
  <object>
    <name>gender</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>115</xmin>
      <ymin>92</ymin>
      <xmax>141</xmax>
      <ymax>115</ymax>
    </bndbox>
  </object>
  <object>
    <name>nation</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>232</xmin>
      <ymin>90</ymin>
      <xmax>256</xmax>
      <ymax>116</ymax>
    </bndbox>
  </object>
  <object>
    <name>birthdate</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>118</xmin>
      <ymin>132</ymin>
      <xmax>306</xmax>
      <ymax>159</ymax>
    </bndbox>
  </object>
  <object>
    <name>address1</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>116</xmin>
      <ymin>182</ymin>
      <xmax>359</xmax>
      <ymax>206</ymax>
    </bndbox>
  </object>
  <object>
    <name>address2</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>117</xmin>
      <ymin>211</ymin>
      <xmax>187</xmax>
      <ymax>238</ymax>
    </bndbox>
  </object>
  <object>`
    <name>idnum</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>207</xmin>
      <ymin>293</ymin>
      <xmax>524</xmax>
      <ymax>324</ymax>
    </bndbox>
  </object>
</annotation>

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