Support Unicode for saving and loading Pascal XML format

Use lxml to pretty the xml instead of minidom because minido does not support unicode
Save xml with unicode
Add tests dir to collect more images for unit tests in the future

libs/pascal_voc_io.py

@@ -1,10 +1,14 @@
+#!/usr/bin/env python
+# -*- coding: utf8 -*-
+import _init_path
 import sys
 from xml.etree import ElementTree
 from xml.etree.ElementTree import Element, SubElement
-from xml.dom import minidom
 from lxml import etree
 
+
 class PascalVocWriter:
+
     def __init__(self, foldername, filename, imgSize, databaseSrc='Unknown', localImgPath=None):
         self.foldername = foldername
         self.filename = filename
@@ -17,9 +21,9 @@ class PascalVocWriter:
         """
             Return a pretty-printed XML string for the Element.
         """
-        rough_string = ElementTree.tostring(elem,'utf8')
-        reparsed = minidom.parseString(rough_string)
-        return reparsed.toprettyxml(indent="\t")
+        rough_string = ElementTree.tostring(elem, 'utf8')
+        root = etree.fromstring(rough_string)
+        return etree.tostring(root, pretty_print=True)
 
     def genXML(self):
         """
@@ -30,46 +34,45 @@ class PascalVocWriter:
                 self.foldername is None or \
                 self.imgSize is None or \
                 len(self.boxlist) <= 0:
-                    return None
+            return None
 
         top = Element('annotation')
-        folder = SubElement(top,'folder')
+        folder = SubElement(top, 'folder')
         folder.text = self.foldername
 
-        filename = SubElement(top,'filename')
+        filename = SubElement(top, 'filename')
         filename.text = self.filename
 
-        localImgPath = SubElement(top,'path')
+        localImgPath = SubElement(top, 'path')
         localImgPath.text = self.localImgPath
 
-        source = SubElement(top,'source')
-        database = SubElement(source,'database')
+        source = SubElement(top, 'source')
+        database = SubElement(source, 'database')
         database.text = self.databaseSrc
 
-        size_part = SubElement(top,'size')
-        width = SubElement(size_part,'width')
-        height = SubElement(size_part,'height')
-        depth = SubElement(size_part,'depth')
+        size_part = SubElement(top, 'size')
+        width = SubElement(size_part, 'width')
+        height = SubElement(size_part, 'height')
+        depth = SubElement(size_part, 'depth')
         width.text = str(self.imgSize[1])
         height.text = str(self.imgSize[0])
-        if len(self.imgSize)==3:
+        if len(self.imgSize) == 3:
             depth.text = str(self.imgSize[2])
         else:
             depth.text = '1'
 
-        segmented = SubElement(top,'segmented')
-        segmented.text ='0'
-
+        segmented = SubElement(top, 'segmented')
+        segmented.text = '0'
         return top
 
     def addBndBox(self, xmin, ymin, xmax, ymax, name):
-        bndbox = {'xmin':xmin, 'ymin':ymin, 'xmax':xmax, 'ymax':ymax}
+        bndbox = {'xmin': xmin, 'ymin': ymin, 'xmax': xmax, 'ymax': ymax}
         bndbox['name'] = name
-        self.boxlist.append(bndbox);
+        self.boxlist.append(bndbox)
 
     def appendObjects(self, top):
         for each_object in self.boxlist:
-            object_item = SubElement(top,'object')
+            object_item = SubElement(top, 'object')
             name = SubElement(object_item, 'name')
             name.text = str(each_object['name'])
             pose = SubElement(object_item, 'pose')
@@ -88,25 +91,26 @@ class PascalVocWriter:
             ymax = SubElement(bndbox, 'ymax')
             ymax.text = str(each_object['ymax'])
 
-    def save(self, targetFile = None):
+    def save(self, targetFile=None):
         root = self.genXML()
         self.appendObjects(root)
         out_file = None
         if targetFile is None:
-            out_file = open(self.filename + '.xml','w')
+            out_file = open(self.filename + '.xml', 'w')
         else:
             out_file = open(targetFile, 'w')
 
-        out_file.write(self.prettify(root))
+        prettifyResult = self.prettify(root)
+        out_file.write(prettifyResult)
         out_file.close()
 
 
 class PascalVocReader:
 
     def __init__(self, filepath):
-        ## shapes type:
-        ## [labbel, [(x1,y1), (x2,y2), (x3,y3), (x4,y4)], color, color]
-        self.shapes=[]
+        # shapes type:
+        # [labbel, [(x1,y1), (x2,y2), (x3,y3), (x4,y4)], color, color]
+        self.shapes = []
         self.filepath = filepath
         self.parseXML()
 
@@ -118,22 +122,23 @@ class PascalVocReader:
         ymin = rect[1]
         xmax = rect[2]
         ymax = rect[3]
-        points = [(xmin, ymin), (xmax, ymin), (xmax, ymax), (xmin, ymax)] 
+        points = [(xmin, ymin), (xmax, ymin), (xmax, ymax), (xmin, ymax)]
         self.shapes.append((label, points, None, None))
 
     def parseXML(self):
         assert self.filepath.endswith('.xml'), "Unsupport file format"
-        xmltree = ElementTree.parse(self.filepath).getroot()
+        parser = etree.XMLParser(encoding='utf-8')
+        xmltree = ElementTree.parse(self.filepath, parser=parser).getroot()
         filename = xmltree.find('filename').text
 
         for object_iter in xmltree.findall('object'):
-           rects = []
-           bndbox = object_iter.find("bndbox")
-           rects.append([int(it.text) for it in bndbox])
-           label = object_iter.find('name').text
+            rects = []
+            bndbox = object_iter.find("bndbox")
+            rects.append([int(it.text) for it in bndbox])
+            label = object_iter.find('name').text
 
-           for rect in rects:
-               self.addShape(label, rect)
+            for rect in rects:
+                self.addShape(label, rect)
         return True
 
 
@@ -146,4 +151,3 @@ tmp.addBndBox(10,10,20,30,'chair')
 tmp.addBndBox(1,1,600,600,'car')
 tmp.save()
 """
-