python opencv画矩形框保存xml和读取显示

 

参考

图书馆空位检测（行人+空位对比）

https://www.cnblogs.com/gooutlook/p/16192389.html

 

 

使用到的原始图像

 

 

 

 

 

 

 

1鼠标选择画框

API_draw.py

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# -*- coding: utf-8 -*-    import copy import cv2 import numpy as np    WIN_NAME = 'draw_rect'    from API_XML import *    class Rect(object):     def __init__(self):         self.tl = (0, 0)         self.br = (0, 0)        def regularize(self):         """         make sure tl = TopLeft point, br = BottomRight point         """         pt1 = (min(self.tl[0], self.br[0]), min(self.tl[1], self.br[1]))         pt2 = (max(self.tl[0], self.br[0]), max(self.tl[1], self.br[1]))         self.tl = pt1         self.br = pt2    class DrawRects(object):     def __init__(self, image, color, thickness=1):         self.original_image = image         self.image_for_show = image         self.color = color         self.thickness = thickness         self.rects = []         self.current_rect = Rect()         self.left_button_down = False        @staticmethod     def __clip(value, low, high):         """         clip value between low and high            Parameters         ----------         value: a number             value to be clipped         low: a number             low limit         high: a number             high limit            Returns         -------         output: a number             clipped value         """         output = max(value, low)         output = min(output, high)         return output        def shrink_point(self, x, y):         """         shrink point (x, y) to inside image_for_show            Parameters         ----------         x, y: int, int             coordinate of a point            Returns         -------         x_shrink, y_shrink: int, int             shrinked coordinate         """         height, width = self.image_for_show.shape[0:2]         x_shrink = self.__clip(x, 0, width)         y_shrink = self.__clip(y, 0, height)         return (x_shrink, y_shrink)        def append(self):         """         add a rect to rects list         """         self.rects.append(copy.deepcopy(self.current_rect))        def pop(self):         """         pop a rect from rects list         """         rect = Rect()         if self.rects:             rect = self.rects.pop()         return rect        def reset_image(self):         """         reset image_for_show using original image         """         self.image_for_show = self.original_image.copy()        def draw(self):         """         draw rects on image_for_show         """         for rect in self.rects:             cv2.rectangle(self.image_for_show, rect.tl, rect.br,                           color=self.color, thickness=self.thickness)        def draw_current_rect(self):         """         draw current rect on image_for_show         """         cv2.rectangle(self.image_for_show,                       self.current_rect.tl, self.current_rect.br,                       color=self.color, thickness=self.thickness)    def onmouse_draw_rect(event, x, y, flags, draw_rects):     if event == cv2.EVENT_LBUTTONDOWN:         # pick first point of rect         print('pt1: x = %d, y = %d' % (x, y))         draw_rects.left_button_down = True         draw_rects.current_rect.tl = (x, y)     if draw_rects.left_button_down and event == cv2.EVENT_MOUSEMOVE:         # pick second point of rect and draw current rect         draw_rects.current_rect.br = draw_rects.shrink_point(x, y)         draw_rects.reset_image()         draw_rects.draw()         draw_rects.draw_current_rect()     if event == cv2.EVENT_LBUTTONUP:         # finish drawing current rect and append it to rects list         draw_rects.left_button_down = False         draw_rects.current_rect.br = draw_rects.shrink_point(x, y)         print('pt2: x = %d, y = %d' % (draw_rects.current_rect.br[0],                                        draw_rects.current_rect.br[1]))         draw_rects.current_rect.regularize()         draw_rects.append()     if (not draw_rects.left_button_down) and event == cv2.EVENT_RBUTTONDOWN:         # pop the last rect in rects list         draw_rects.pop()         draw_rects.reset_image()         draw_rects.draw()           if __name__ == '__main__':     #image = np.zeros((256, 256, 3), np.uint8)        image=cv2.imread("map1.png")     draw_rects = DrawRects(image, (0, 255, 0), 2)     cv2.namedWindow(WIN_NAME, 0)     cv2.setMouseCallback(WIN_NAME, onmouse_draw_rect, draw_rects)     while True:         cv2.imshow(WIN_NAME, draw_rects.image_for_show)         key = cv2.waitKey(30)         if key == ord('q') or key == ord('Q') :  # ESC             break         elif key == ord('s') or key == ord('S') :             print("===========\n")             i=1                #1创建             # 1.创建DOM树对象             dom=minidom.Document()             API_Creat_Xml_Node1(dom,"root")                for rect in draw_rects.rects:                 print("x1",rect.tl[0],"y1",rect.tl[1], "x2",rect.br[0],"y2",rect.br[1])                    # 2.1创建次节点                 root2_node=API_Creat_Xml_Node2(dom,"zuowei",str(i))                 API_Creat_Xml_Node3(dom,root2_node,"xmin",str(rect.tl[0]))                 API_Creat_Xml_Node3(dom,root2_node,"ymin",str(rect.tl[1]))                 API_Creat_Xml_Node3(dom,root2_node,"xmax",str(rect.br[0]))                 API_Creat_Xml_Node3(dom,root2_node,"ymax",str(rect.br[1]))                 i=i+1                try:                 with open(path_xml,'w',encoding='UTF-8') as fh:                     # 4.writexml()第一个参数是目标文件对象，第二个参数是根节点的缩进格式，第三个参数是其他子节点的缩进格式，                     # 第四个参数制定了换行格式，第五个参数制定了xml内容的编码。                     dom.writexml(fh,indent='',addindent='\t',newl='\n',encoding='UTF-8')                     print('写入xml OK!')             except Exception as err:                 print('错误信息：{0}'.format(err))                   #2读取             #USE_2_1ReadXMLNode(path_xml,"zuowei","xmin")             #访问所有的座位节点             USE_2_2ReadXMLNode(path_xml,"zuowei",["xmin","ymin","xmax","ymax"])                              cv2.destroyAllWindows()

　　API_XML.py

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#导入minidom from xml.dom import minidom    path_xml='config.xml' # 1.创建DOM树对象 dom=minidom.Document()       def API_Creat_Xml_Node1(dom,root1_Name):     # 1.创建DOM树对象     #dom=minidom.Document()     # 2.创建根节点。每次都要用DOM对象来创建任何节点。     root_node=dom.createElement(root1_Name)     # 3.用DOM对象添加根节点     dom.appendChild(root_node)      # 设置该节点的属性     root_node.setAttribute('info','主节点')                 def API_Creat_Xml_Node2(dom,root2_Name,msg):        # 获取根节点     root_node=dom.documentElement     # 节点名称     print(root_node.nodeName)        # 用DOM对象创建元素子节点     root2_node=dom.createElement(root2_Name)     # 用父节点对象添加元素子节点     root_node.appendChild(root2_node)     # 设置该节点的属性     root2_node.setAttribute('info',msg)     return root2_node       def API_Creat_Xml_Node3(dom,root2_node,root3_Name,msg):                  root3_node=dom.createElement(root3_Name)     root2_node.appendChild(root3_node)     # 也用DOM创建文本节点，把文本节点（文字内容）看成子节点     name_text=dom.createTextNode(msg)     # 用添加了文本的节点对象（看成文本节点的父节点）添加文本节点     root3_node.appendChild(name_text)          ''' 函数功能：创建数据 函数输入：path_xml 文件名字 函数输出：     <?xml version="1.0" encoding="UTF-8"?>     <root info="主节点">         <car info="car1">             <xmin>1</xmin>             <ymin>2</ymin>             <xmax>3</xmax>             <ymax>4</ymax>         </car>         <car info="car2">             <xmin>5</xmin>             <ymin>6</ymin>             <xmax>7</xmax>             <ymax>8</ymax>         </car>     </root> '''    def USE_1Creat_Xml(path_xml):     # 1.创建DOM树对象     dom=minidom.Document()     API_Creat_Xml_Node1(dom,"root")        # 2.1创建次节点     root2_node=API_Creat_Xml_Node2(dom,"car","car1")     API_Creat_Xml_Node3(dom,root2_node,"xmin","1")     API_Creat_Xml_Node3(dom,root2_node,"ymin","2")     API_Creat_Xml_Node3(dom,root2_node,"xmax","3")     API_Creat_Xml_Node3(dom,root2_node,"ymax","4")           # 2.2创建次节点     root2_node=API_Creat_Xml_Node2(dom,"car","car2")     API_Creat_Xml_Node3(dom,root2_node,"xmin","5")     API_Creat_Xml_Node3(dom,root2_node,"ymin","6")     API_Creat_Xml_Node3(dom,root2_node,"xmax","7")     API_Creat_Xml_Node3(dom,root2_node,"ymax","8")        # 每一个结点对象（包括dom对象本身）都有输出XML内容的方法，如：toxml()--字符串, toprettyxml()--美化树形格式。        try:         with open(path_xml,'w',encoding='UTF-8') as fh:             # 4.writexml()第一个参数是目标文件对象，第二个参数是根节点的缩进格式，第三个参数是其他子节点的缩进格式，             # 第四个参数制定了换行格式，第五个参数制定了xml内容的编码。             dom.writexml(fh,indent='',addindent='\t',newl='\n',encoding='UTF-8')             print('写入xml OK!')     except Exception as err:         print('错误信息：{0}'.format(err))             ''' 函数功能：读取数据    函数输入： path_xml 文件名字 root1_Name 2次节点  car root2_Name 3次节点  xmin    函数输出：     <?xml version="1.0" encoding="UTF-8"?>     <root info="主节点">         <car info="car1">             <xmin>1</xmin>             <ymin>2</ymin>             <xmax>3</xmax>             <ymax>4</ymax>         </car>         <car info="car2">             <xmin>5</xmin>             <ymin>6</ymin>             <xmax>7</xmax>             <ymax>8</ymax>         </car>     </root> '''    def USE_2_1ReadXMLNode(path_xml,root1_Name,root2_Name):     #打开文件     with open(path_xml,'r',encoding='utf8') as fh:         # 1 获取根节点         # parse()获取DOM对象         dom=minidom.parse(fh)         # 获取根节点         root=dom.documentElement         # 节点名称         print(root.nodeName)                    #2 获取2次节点 root1_Name 是一个列表         change_1Node_all = root.getElementsByTagName(root1_Name) # 所有的 car节点         #循环访问每个次节点         for change_1Node_i in change_1Node_all:             #3 获取2次节点 root1_Name 下面的3次节点 root2_Name 是一个列表             change_2Node = change_1Node_i.getElementsByTagName(root2_Name)[0] #肯恶搞有很多个root2_Name xmin             change_old= change_2Node.childNodes[0].data             print(change_old)               ''' 函数功能：访问所有 root1_Name下面的 指定属性root2_NameList 函数输入： 节点root1_Name          car 指定属性root2_NameList  ["xmin","ymin","xmax","ymax"]    函数输出： root 节点名字 ['xmin', 'ymin', 'xmax', 'ymax'] 相同节点 0 ['33', '42', '106', '90'] 相同节点 0 ['80', '139', '167', '195'] 相同节点 0 ['150', '87', '217', '141']       '''    def USE_2_2ReadXMLNode(path_xml,root1_Name,root2_NameList):     #打开文件     with open(path_xml,'r',encoding='utf8') as fh:         # 1 获取根节点         # parse()获取DOM对象         dom=minidom.parse(fh)         # 获取根节点         root=dom.documentElement         # 节点名称         print(root.nodeName)                    #2 获取2次节点 root1_Name 是一个列表         change_1Node_all = root.getElementsByTagName(root1_Name) # 所有的 car节点            print('节点名字',root1_Name)         print('节点属性',root2_NameList)         i=0            data_msg_all=[]         #循环访问每个次节点         for change_1Node_i in change_1Node_all:                            data_msg=[]             for root2_Name_i in root2_NameList:                 #3 获取2次节点 root1_Name 下面的3次节点 root2_Name 是一个列表                 change_2Node = change_1Node_i.getElementsByTagName(root2_Name_i)[0] #肯恶搞有很多个root2_Name xmin                 date= change_2Node.childNodes[0].data                 #print(root2_Name_i,date)                 data_msg.append(date)             data_msg_all.append(data_msg)                print(root1_Name,'节点',i,data_msg)             i=i+1            print("所有信息",data_msg_all)         return data_msg_all    '''    #1创建 USE_1Creat_Xml(path_xml)    #2读取 USE_2_1ReadXMLNode(path_xml,"car","xmin")    #2-1读取 USE_2_2ReadXMLNode(path_xml,"car",["xmin","ymin","xmax","ymax"])    '''    ''' #1创建 # 1.创建DOM树对象 dom=minidom.Document() API_Creat_Xml_Node1(dom,"root")    #2循环添加节点 for rect in rects:     print("x1",rect.tl[0],"y1",rect.tl[1], "x2",rect.br[0],"y2",rect.br[1])        # 2.1创建次节点     root2_node=API_Creat_Xml_Node2(dom,"zuowei",str(i))     API_Creat_Xml_Node3(dom,root2_node,"xmin",str(rect.tl[0]))     API_Creat_Xml_Node3(dom,root2_node,"ymin",str(rect.tl[1]))     API_Creat_Xml_Node3(dom,root2_node,"xmax",str(rect.br[0]))     API_Creat_Xml_Node3(dom,root2_node,"ymax",str(rect.br[1]))     i=i+1    try:     with open(path_xml,'w',encoding='UTF-8') as fh:         # 4.writexml()第一个参数是目标文件对象，第二个参数是根节点的缩进格式，第三个参数是其他子节点的缩进格式，         # 第四个参数制定了换行格式，第五个参数制定了xml内容的编码。         dom.writexml(fh,indent='',addindent='\t',newl='\n',encoding='UTF-8')         print('写入xml OK!') except Exception as err:     print('错误信息：{0}'.format(err))       #2读取 #USE_2_1ReadXMLNode(path_xml,"zuowei","xmin") #访问所有的座位节点 USE_2_2ReadXMLNode(path_xml,"zuowei",["xmin","ymin","xmax","ymax"])    '''

　　之后保存了 config文件

 

 

 

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<?xml version="1.0" encoding="UTF-8"?> <root info="主节点">     <zuowei info="1">         <xmin>200</xmin>         <ymin>79</ymin>         <xmax>333</xmax>         <ymax>177</ymax>     </zuowei>     <zuowei info="2">         <xmin>395</xmin>         <ymin>81</ymin>         <xmax>538</xmax>         <ymax>178</ymax>     </zuowei>     <zuowei info="3">         <xmin>794</xmin>         <ymin>76</ymin>         <xmax>936</xmax>         <ymax>175</ymax>     </zuowei>     <zuowei info="4">         <xmin>199</xmin>         <ymin>308</ymin>         <xmax>329</xmax>         <ymax>400</ymax>     </zuowei> </root>

　　

 

2 读取xml可视化矩形框

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# -*- coding: utf-8 -*-    import copy import cv2 import numpy as np    WIN_NAME = 'draw_rect'    from API_XML import *    class Rect(object):     def __init__(self):         self.tl = (0, 0)         self.br = (0, 0)        def regularize(self):         """         make sure tl = TopLeft point, br = BottomRight point         """         pt1 = (min(self.tl[0], self.br[0]), min(self.tl[1], self.br[1]))         pt2 = (max(self.tl[0], self.br[0]), max(self.tl[1], self.br[1]))         self.tl = pt1         self.br = pt2    class DrawRects(object):     def __init__(self, image, color, thickness=1):         self.original_image = image         self.image_for_show = image         self.color = color         self.thickness = thickness         self.rects = []         self.current_rect = Rect()         self.left_button_down = False        @staticmethod     def __clip(value, low, high):         """         clip value between low and high            Parameters         ----------         value: a number             value to be clipped         low: a number             low limit         high: a number             high limit            Returns         -------         output: a number             clipped value         """         output = max(value, low)         output = min(output, high)         return output        def shrink_point(self, x, y):         """         shrink point (x, y) to inside image_for_show            Parameters         ----------         x, y: int, int             coordinate of a point            Returns         -------         x_shrink, y_shrink: int, int             shrinked coordinate         """         height, width = self.image_for_show.shape[0:2]         x_shrink = self.__clip(x, 0, width)         y_shrink = self.__clip(y, 0, height)         return (x_shrink, y_shrink)        def append(self):         """         add a rect to rects list         """         self.rects.append(copy.deepcopy(self.current_rect))        def pop(self):         """         pop a rect from rects list         """         rect = Rect()         if self.rects:             rect = self.rects.pop()         return rect        def reset_image(self):         """         reset image_for_show using original image         """         self.image_for_show = self.original_image.copy()        def draw(self):         """         draw rects on image_for_show         """         for rect in self.rects:             cv2.rectangle(self.image_for_show, rect.tl, rect.br,                           color=self.color, thickness=self.thickness)        def draw_current_rect(self):         """         draw current rect on image_for_show         """         cv2.rectangle(self.image_for_show,                       self.current_rect.tl, self.current_rect.br,                       color=self.color, thickness=self.thickness)    def onmouse_draw_rect(event, x, y, flags, draw_rects):     if event == cv2.EVENT_LBUTTONDOWN:         # pick first point of rect         print('pt1: x = %d, y = %d' % (x, y))         draw_rects.left_button_down = True         draw_rects.current_rect.tl = (x, y)     if draw_rects.left_button_down and event == cv2.EVENT_MOUSEMOVE:         # pick second point of rect and draw current rect         draw_rects.current_rect.br = draw_rects.shrink_point(x, y)         draw_rects.reset_image()         draw_rects.draw()         draw_rects.draw_current_rect()     if event == cv2.EVENT_LBUTTONUP:         # finish drawing current rect and append it to rects list         draw_rects.left_button_down = False         draw_rects.current_rect.br = draw_rects.shrink_point(x, y)         print('pt2: x = %d, y = %d' % (draw_rects.current_rect.br[0],                                        draw_rects.current_rect.br[1]))         draw_rects.current_rect.regularize()         draw_rects.append()     if (not draw_rects.left_button_down) and event == cv2.EVENT_RBUTTONDOWN:         # pop the last rect in rects list         draw_rects.pop()         draw_rects.reset_image()         draw_rects.draw()           if __name__ == '__main__':     #image = np.zeros((256, 256, 3), np.uint8)        image=cv2.imread("map1.png")       #2读取     #USE_2_1ReadXMLNode(path_xml,"zuowei","xmin")     #访问所有的座位节点     data_msg_all=USE_2_2ReadXMLNode(path_xml,"zuowei",["xmin","ymin","xmax","ymax"])          for car_i in data_msg_all:         print('数据',car_i)         cv2.rectangle(image, (int(car_i[0]),int(car_i[1])), (int(car_i[2]),int(car_i[3])),                 color=(0, 255, 0), thickness=2)                cv2.namedWindow(WIN_NAME, 0)           while True:         cv2.imshow(WIN_NAME,image)         key = cv2.waitKey(1)         if key == ord('q') or key == ord('Q') :  # ESC             break                                                                  cv2.destroyAllWindows()

　　

 

3 后期有框占用的计算

API_IOU.py

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#!/usr/bin/env python # encoding: utf-8    import numpy as np    ''' 函数说明：计算两个框的重叠面积 输入： rec1  第一个框xmin ymin xmax ymax rec2  第二个框xmin ymin xmax ymax 输出： iouv 重叠比例 0 没有 ''' def compute_iou(rec1, rec2):                          # computing area of each rectangles     S_rec1 = (float(rec1[2]) - float(rec1[0])) * (float(rec1[3]) - float(rec1[1])) # H1*W1     S_rec2 = (float(rec2[2]) - float(rec2[0])) * (float(rec2[3]) - float(rec2[1])) # H2*W2          # computing the sum_area     sum_area = S_rec1 + S_rec2 #总面积          # find the each edge of intersect rectangle     left_line = max(float(rec1[0]), float(rec2[0]))     right_line = min(float(rec1[2]), float(rec2[2]))     top_line = max(float(rec1[1]), float(rec2[1]))     bottom_line = min(float(rec1[3]), float(rec2[3]))           # judge if there is an intersect     if left_line >= right_line or top_line >= bottom_line:         #print("没有重合区域")         return 0     else:     #print("有重合区域")         intersect = (right_line - left_line) * (bottom_line - top_line)        #iouv=(float(intersect) / float(sum_area - intersect))*1.0         iouv=(float(intersect) / float(S_rec2))*1.0         return iouv    ''' 函数说明：获取两组匹配结果 输入： rectA  车位 rectB  车辆 threod 重叠面积最小数值界限 默认0.6 输出： CarUse 一维数组保存是否占用  1 占用 0 没有    ''' def TestCarUse(rectA,rectB,threod=0.6,debug=0):     #threod=0.8#设定最小值     ALength=len(rectA)     BLength=len(rectB)        #创建保存匹配结果的矩阵     recIOU=np.zeros((ALength,BLength),dtype=float,order='C')     #用于记录车位能够使否占用       CarUse=np.zeros((1,ALength),dtype=int,order='C')        for i in range(0,ALength):         for j in range(0,BLength):             iou = compute_iou(rectA[i], rectB[j])             recIOU[i][j]=format(iou,'.3f')             if iou>=threod:                        CarUse[0,i]=1  #有一个超过匹配认为车位i被占用                 break     if debug==1:         print('----匹配矩阵----')         print(recIOU)         print('----车位占用情况 1占用 0空闲----')         for i in range(0,ALength):             msg='车位编号'+':'+str(i)+"-"+str(CarUse[0][i])             print(msg)     return CarUse             def Use():     #A代表车位     rectA1 = (30, 10, 70, 20)     rectA2 = (70, 10, 80, 20)     rectA =[rectA1,rectA2]     #B代表检测车辆     rectB1 = (20, 10, 35, 20)     rectB2 = (30, 15, 70, 25)     rectB3 = (70, 10, 80, 20)     rectB =[rectB1,rectB2,rectB3]     print(rectB)     #获取车位占用情况 rectA车位  rectB车辆  0.6占面积最小比     CarUse=TestCarUse(rectA,rectB,0.6,1)        print('----车位占用情况----')     for i in range(0,len(CarUse)+1):         msg='车位'+str(i)+"-"+str(CarUse[0][i])         print(msg)       #Use()