pyqt5 使用cv2 显示图片，摄像头

最新推荐文章于 2025-07-08 19:29:30 发布

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本文介绍如何利用Python中的PyQt5和OpenCV库来实现实时摄像头画面的捕获与显示。具体包括搭建界面、启动摄像头、获取图像帧并将其转换为可在PyQt5中显示的格式等关键步骤。

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#! /usr/bin/python3
# coding = utf-8
# from PyQt5 import QtGui,QtCore,Qt
import sys
from PyQt5.QtCore import Qt,pyqtSignal,QSize,QRect,QMetaObject, QCoreApplication, pyqtSlot,QPropertyAnimation,QThread
from PyQt5.QtGui import QIcon, QFont, QPixmap, QPainter, QImage
from PyQt5.QtWidgets import QMainWindow, QApplication

import cv2
from gevent.libev.corecext import SIGNAL, time
from qtpy importQtCore

class mycsms(QMainWindow):
    def __init__(self):
        super(mycsms, self).__init__()
        self.setupUi(self)
        self.image= QImage()
        self.device= cv2.VideoCapture(0)
        self.playTimer= Timer("updatePlay()")
        self.connect(self.playTimer, SIGNAL("updatePlay()"), self.showCamer)

    # 读摄像头
    def showCamer(self):
        if self.device.isOpened():
            ret, frame= self.device.read()
        else:
            ret = False
        # 读写磁盘方式
        # cv2.imwrite("2.png",frame)
        #self.image.load("2.png")

        height, width, bytesPerComponent= frame.shape
        bytesPerLine = bytesPerComponent* width
        # 变换彩色空间顺序
        cv2.cvtColor(frame, cv2.COLOR_BGR2RGB,frame)
        # 转为QImage对象
        self.image= QImage(frame.data, width, height, bytesPerLine, QImage.Format_RGB888)
        self.view.setPixmap(QPixmap.fromImage(self.image))

if __name__ == "__main__":
    app = QApplication(sys.argv)
    myshow = mycsms()
    myshow.playTimer.start()
    myshow.show()
    sys.exit(app.exec_())

# 线程类：
class Timer(QtCore.QThread):

    def __init__(self, signal="updateTime()", parent=None):
        super(Timer, self).__init__(parent)
        self.stoped= False
        self.signal= signal
        self.mutex= QtCore.QMutex()

    def run(self):
        with QtCore.QMutexLocker(self.mutex):
            self.stoped= False
        while True:
            if self.stoped:
                return
            self.emit(QtCore.SIGNAL(self.signal))
            #40毫秒发送一次信号
            time.sleep(0.04)

    def stop(self):
        with QtCore.QMutexLocker(self.mutex):
            self.stoped= True

    def isStoped(self):
        with QtCore.QMutexLocker(self.mutex):
            return self.stoped