标签上的 PYQT5 网络摄像头未打开

Question

我正在尝试将我的网络摄像头设置为标签并在页面加载时打开它。但是代码不会抛出任何错误，它也不会绑定到标签。谁能告诉我如何解决这个问题？

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'camera.ui'
#
# Created by: PyQt5 UI code generator 5.15.2
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.


from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow,qApp
import sys
import cv2

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayoutWidget = QtWidgets.QWidget(self.centralwidget)
        self.gridLayoutWidget.setGeometry(QtCore.QRect(169, 59, 471, 251))
        self.gridLayoutWidget.setObjectName("gridLayoutWidget")
        self.gridLayout = QtWidgets.QGridLayout(self.gridLayoutWidget)
        self.gridLayout.setContentsMargins(0, 0, 0, 0)
        self.gridLayout.setObjectName("gridLayout")

        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 26))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)


        self.label = QtWidgets.QLabel(self.gridLayoutWidget)
        self.label.setObjectName("label")
        self.gridLayout.addWidget(self.label, 0, 0, 1, 1)
        self.capture = cv2.cv2.VideoCapture(0)
        timer = QtCore.QTimer()
        timer.setInterval(int(1000/30))
        timer.timeout.connect(self.get_frame)
        timer.start()        

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)


    def get_frame(self):
        frame = self.capture.read()
        image = QtGui.QImage(frame, *frame.shape[1::-1], QtGui.QImage.Format_RGB888).rgbSwapped()
        pixmap = QtGui.QPixmap.fromImage(image)
        self.label.setPixmap(pixmap)



    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
      


class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())

Answer 1

问题是timer是一个局部变量，会被销毁所以get_frame方法不会被调用，解决方法是让它成为class的成员所以你必须改变timer 到 self.timer。还有 read() 方法 returns 一个元组，没有框架所以你应该把它改成：

def get_frame(self):
    ret, frame = self.capture.read()
    if ret:
        image = QtGui.QImage(
            frame, *frame.shape[1::-1], QtGui.QImage.Format_RGB888
        ).rgbSwapped()
        pixmap = QtGui.QPixmap.fromImage(image)
        self.label.setPixmap(pixmap)

标签上的 PYQT5 网络摄像头未打开

PYQT5 webcam is not opening on the label

webcam

pyqt5

cv2