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# yolov4-tiny目标检测
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import cv2
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import numpy as np
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from myFunction import drawButton
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#(1)导入yolov4-tiny网络模型结构
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# 传入模型结构.cfg文件,模型权重参数.weight文件
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net = cv2.dnn.readNet('dnn_model\yolov4-tiny.cfg', 'dnn_model\yolov4-tiny.weights')
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# 定义一个目标检测模型,将模型传进去
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model = cv2.dnn_DetectionModel(net)
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'''
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设置模型的输入
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size:将输入的图像缩放至指定大小。size越大检测效果越好,但是检测速度越慢
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scale:像素值的缩放大小。在opencv中每个像素值的范围在0-255之间,而在神经网络中每个像素值在0-1之间
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'''
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model.setInputParams(size=(416, 416), scale=1/255)
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#(2)获取分类文本的信息
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classes = [] # 存放每个分类的名称
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with open('dnn_model\classes.txt') as file_obj:
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# 获取文本中的每一行
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for class_name in file_obj.readlines():
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# 删除文本中的换行符、空格等
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class_name = class_name.strip()
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# 将每个分类名保存到列表中
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classes.append(class_name)
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#(3)视频捕获
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filepath = 'F:\\yolov4-tiny\\1.mp4'
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cap = cv2.VideoCapture(filepath)
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#(4)创建鼠事件
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# 创建按钮,默认停用
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button_class = False
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button_index = None # 存放哪个按键被点亮了
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# 定义鼠标回调函数
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def click_button(event, x, y, flags, params):
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# 调用外部变量
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global button_class
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global button_index
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# 设置事鼠标件event为点击鼠标左键
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if event == cv2.EVENT_LBUTTONDOWN:
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# 检查鼠标的坐标是否在矩形框按键内部,index代表第几个按钮
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# 遍历每个矩形框,每个框包含四个角的坐标
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for index, pt in enumerate(np.array(buttonList)): # 要转换成numpy类型
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# 如果设为True,计算鼠标左键距离矩形框的距离
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is_inside = cv2.pointPolygonTest(pt, (x,y), False)
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if is_inside > 0: # 鼠标在矩形框内部
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print(f'click in the No.{index+1}', (x,y))
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# 如果鼠标点击位置在矩形框内部,并且上一次没点击
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if button_class == False:
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# 激活按钮
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button_class = True
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# 激活哪个分类的检测框
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button_index = index
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# 如果鼠标点击位置不在矩形框内部
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else:
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button_class = False
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#(5)创建窗口
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cv2.namedWindow('Image') # 窗口名和显示图像的窗口名相同
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# 设置鼠标回调,窗口名和上面相同,自定义回调函数
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cv2.setMouseCallback('Image', click_button)
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# 创建按钮
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usenames = ['all', 'person', 'car', 'bus', 'truck']
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button = drawButton(usenames)
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#(6)定义检测框绘制函数
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colorline = (0,255,0) # 角点线段颜色
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angerline = 13 # 角点线段长度
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def drawbbx(img, x, y, w, h, predName, score):
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# 检测框
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cv2.rectangle(img, (x, y), (x+w, y+h), (255,255,0), 1)
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# 角点美化
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cv2.line(img, (x,y), (x+angerline,y), colorline, 2)
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cv2.line(img, (x,y), (x,y+angerline), colorline, 2)
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cv2.line(img, (x+w,y), (x+w,y+angerline), colorline, 2)
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cv2.line(img, (x+w,y), (x+w-angerline,y), colorline, 2)
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cv2.line(img, (x,y+h), (x,y+h-angerline), colorline, 2)
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cv2.line(img, (x,y+h), (x+angerline,y+h), colorline, 2)
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cv2.line(img, (x+w,y+h), (x+w,y+h-angerline), colorline, 2)
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cv2.line(img, (x+w,y+h), (x+w-angerline,y+h), colorline, 2)
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# 显示预测的类别
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cv2.putText(img, predName, (x,y+h+20), cv2.FONT_HERSHEY_COMPLEX, 1, (0,255,0), 2)
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# 显示预测概率
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cv2.putText(img, str(int(score*100))+'%', (x,y-5), cv2.FONT_HERSHEY_COMPLEX, 1, (0,255,255), 2)
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#(6)对每一帧视频图像处理
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while True:
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# 返回是否读取成功ret和读取的帧图像frame
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ret, frame = cap.read()
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# 图像比较大把它缩小一点
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frame = cv2.resize(frame, (1280,720))
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# 视频比较短,循环播放
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if cap.get(cv2.CAP_PROP_POS_FRAMES) == cap.get(cv2.CAP_PROP_FRAME_COUNT):
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# 如果当前帧==总帧数,那就重置当前帧为0
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cap.set(cv2.CAP_PROP_POS_FRAMES, 0)
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# 目标检测
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'''
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返回值
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classids:检测得到的类别
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score:检测得到的目标的概率
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bbox:检测框的85项信息
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参数
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confThreshold:目标检测最小置信度
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nmsThreshold:非极大值抑制的自定义参数
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'''
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classids, scores, bboxes = model.detect(frame, 0.5, 0.3)
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# 在画面上创建按钮
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button.drawRec_many(frame)
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# 获取所有矩形框的四个角的坐标
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buttonList = button.recList
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#(7)显示检测结果
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# 遍历所有的检测框信息,把它们绘制出来
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for class_id, score, bbox in zip(classids, scores, bboxes):
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# 获取检测框的左上角坐标和宽高
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x, y, w, h = bbox
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# 获取检测框对应的分类名
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class_name = classes[class_id]
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# 遍历四个按键的名称
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for index, name in enumerate(usenames):
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# 设置检测条件,只有检测到的类别是person并且鼠标点击位置在矩形框内
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if class_name == name and index == button_index:
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# 绘制class_name类别的检测框
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drawbbx(frame, x, y, w, h, class_name, score)
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elif name == 'all' and index == button_index:
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# 绘制所有类别的检测框
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drawbbx(frame, x, y, w, h, class_name, score)
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# 显示图像
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cv2.imshow('Image', frame) #窗口名,图像变量
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if cv2.waitKey(30) & 0xFF==27: #每帧滞留1毫秒后消失
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break
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# 释放视频资源
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cap.release()
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cv2.destroyAllWindows()
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