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声明：这只是简简单单地打开摄像头显示图片的代码。
ui代码(直接用Qt Designer设计的):
要用的库全放ui代码里了，就不放在实现代码里了，直接两段代码黏一起就可运行。
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QTimer
from PyQt5.QtWidgets import QMessageBox
from PyQt5.QtGui import QImage, QPixmap
import cv2
import sys
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(753, 629)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.pushButton = QtWidgets.QPushButton(self.centralwidget)
self.pushButton.setGeometry(QtCore.QRect(210, 520, 93, 28))
self.pushButton.setObjectName("pushButton")
self.label = QtWidgets.QLabel(self.centralwidget)
self.label.setGeometry(QtCore.QRect(60, 20, 640, 480))
self.label.setFrameShape(QtWidgets.QFrame.WinPanel)
self.label.setFrameShadow(QtWidgets.QFrame.Sunken)
self.label.setText("")
self.label.setAlignment(QtCore.Qt.AlignCenter)
self.label.setObjectName("label")
self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
self.pushButton_2.setGeometry(QtCore.QRect(440, 520, 93, 28))
self.pushButton_2.setObjectName("pushButton_2")
self.label.raise_()
self.pushButton.raise_()
self.pushButton_2.raise_()
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 753, 26))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.pushButton.setText(_translate("MainWindow", "打开摄像头"))
self.pushButton_2.setText(_translate("MainWindow", "关闭摄像头"))
实现代码:
class Open_Camera(QtWidgets.QMainWindow,Ui_MainWindow):
def __init__(self):
super(Open_Camera,self).__init__()
self.setupUi(self) #创建窗体对象
self.init()
self.cap = cv2.VideoCapture(0,cv2.CAP_DSHOW) #摄像头
def init(self):
#定时器让其定时读取显示图片
self.camera_timer = QTimer()
self.camera_timer.timeout.connect(self.show_image)
#打开摄像头
self.pushButton.clicked.connect(self.open_camera)
#关闭摄像头
self.pushButton_2.clicked.connect(self.close_camera)
'''开启摄像头'''
def open_camera(self):
if self.cap.isOpened():
self.camera_timer.start(40) #每40毫秒读取一次，即刷新率为25帧
self.show_image()
else:
QMessageBox.critical(self,'错误','摄像头未打开！')
return None
'''显示图片'''
def show_image(self):
flag,image = self.cap.read() #从视频流中读取图片
image_show = cv2.resize(image,(640,480)) #把读到的帧的大小重新设置为 640x480
height,width = image_show.shape[:2] #行:高,列:宽
image_show = cv2.cvtColor(image_show,cv2.COLOR_BGR2RGB) #opencv读的通道是BGR,要转成RGB
image_show = cv2.flip(image_show, 1) #水平翻转，因为摄像头拍的是镜像的。
#把读取到的视频数据变成QImage形式(图片数据、宽、长、RGB颜色空间，三个通道各有2**8=256种颜色)
show = QtGui.QImage(image_show.data,width,height,QImage.Format_RGB888)
self.label.setPixmap(QPixmap.fromImage(show)) # 往显示视频的Label里显示QImage
'''关闭摄像头'''
def close_camera(self):
self.camera_timer.stop() #停止读取
self.cap.release() #释放摄像头
self.label.clear() #清除label组件上的图片
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
ui = Open_Camera()
ui.show()
sys.exit(app.exec_())
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