利用摄像头拍照并保存照片的程序（python实现，含UI界面），为了使用和后续开发方

摘要：许多情况下我们需要用到摄像头获取图像，进而处理图像，这篇博文介绍利用pyqt5、OpenCV实现用电脑上连接的摄像头拍照并保存照片。为了使用和后续开发方便，这里利用pyqt5设计了个相机界面，后面将介绍如何实现，要点如下：

• 界面设计
• 逻辑实现
• 完整代码

点击跳转至博文涉及的全部文件下载页

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1. 前言

    最近的项目中需要用到摄像头获取画面，于是利用OpenCV-python写了个调用摄像头的程序，同时为了后面开发和使用方便，这里利用pyqt5设计了个简单的UI界面。调用摄像头的程序非常简单，网上也有很多类似代码但带界面的不多，本来只想写个利用摄像头获取画面的程序，后来一想干脆在里面加了个拍照并保存照片的功能，有需要的朋友可以在上面进行改进或再次开发。

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2. 界面设计

    从运行界面就能看出，这里UI界面的层次是非常简单的，利用Qt-Designer进行设计，拖出三个按钮及两个label控件摆放如下面的界面窗口所示：

    所添加控件的层次和命名如下图所示：

    当然虽说目的是写个简单版的相机UI界面，但为了适当美观博主还对控件的字体、文本显示、图标等进行了设置，其中用到的图片资源如下图所示：

    利用PyQt5中的PyUIC工具将UI文件转换为py文件，其代码如下，在其中就能看到对于控件的具体设置：

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

# Form implementation generated from reading ui file 'Camera.ui'
#
# Created by: PyQt5 UI code generator 5.11.3
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.setWindowModality(QtCore.Qt.NonModal)
        MainWindow.resize(765, 645)
        MainWindow.setMinimumSize(QtCore.QSize(765, 645))
        MainWindow.setMaximumSize(QtCore.QSize(16777215, 16777215))
        icon = QtGui.QIcon()
        icon.addPixmap(QtGui.QPixmap(":/newPrefix/pic/pai.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        MainWindow.setWindowIcon(icon)
        MainWindow.setToolTip("")
        MainWindow.setAutoFillBackground(False)
        MainWindow.setTabShape(QtWidgets.QTabWidget.Rounded)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.centralwidget)
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.verticalLayout = QtWidgets.QVBoxLayout()
        self.verticalLayout.setObjectName("verticalLayout")
        self.label = QtWidgets.QLabel(self.centralwidget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.MinimumExpanding, QtWidgets.QSizePolicy.Preferred)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.label.sizePolicy().hasHeightForWidth())
        self.label.setSizePolicy(sizePolicy)
        font = QtGui.QFont()
        font.setFamily("华文隶书")
        font.setPointSize(20)
        self.label.setFont(font)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")
        self.verticalLayout.addWidget(self.label)
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setSizeConstraint(QtWidgets.QLayout.SetDefaultConstraint)
        self.horizontalLayout.setContentsMargins(-1, 50, -1, -1)
        self.horizontalLayout.setSpacing(0)
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.pushButton_open = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_open.setMinimumSize(QtCore.QSize(100, 40))
        self.pushButton_open.setMaximumSize(QtCore.QSize(120, 40))
        font = QtGui.QFont()
        font.setFamily("华文彩云")
        font.setPointSize(12)
        self.pushButton_open.setFont(font)
        icon1 = QtGui.QIcon()
        icon1.addPixmap(QtGui.QPixmap(":/newPrefix/pic/g1.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.pushButton_open.setIcon(icon1)
        self.pushButton_open.setObjectName("pushButton_open")
        self.horizontalLayout.addWidget(self.pushButton_open)
        self.pushButton_take = QtWidgets.QPushButton(self.centralwidget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.pushButton_take.sizePolicy().hasHeightForWidth())
        self.pushButton_take.setSizePolicy(sizePolicy)
        self.pushButton_take.setMinimumSize(QtCore.QSize(100, 40))
        self.pushButton_take.setMaximumSize(QtCore.QSize(100, 40))
        font = QtGui.QFont()
        font.setFamily("华文彩云")
        font.setPointSize(12)
        self.pushButton_take.setFont(font)
        self.pushButton_take.setIcon(icon)
        self.pushButton_take.setObjectName("pushButton_take")
        self.horizontalLayout.addWidget(self.pushButton_take)
        self.pushButton_close = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_close.setMinimumSize(QtCore.QSize(100, 40))
        self.pushButton_close.setMaximumSize(QtCore.QSize(130, 40))
        font = QtGui.QFont()
        font.setFamily("华文彩云")
        font.setPointSize(12)
        self.pushButton_close.setFont(font)
        icon2 = QtGui.QIcon()
        icon2.addPixmap(QtGui.QPixmap(":/newPrefix/pic/down.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.pushButton_close.setIcon(icon2)
        self.pushButton_close.setObjectName("pushButton_close")
        self.horizontalLayout.addWidget(self.pushButton_close)
        self.horizontalLayout.setStretch(0, 1)
        self.horizontalLayout.setStretch(1, 1)
        self.horizontalLayout.setStretch(2, 1)
        self.verticalLayout.addLayout(self.horizontalLayout)
        self.label_face = QtWidgets.QLabel(self.centralwidget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Expanding)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.label_face.sizePolicy().hasHeightForWidth())
        self.label_face.setSizePolicy(sizePolicy)
        self.label_face.setMinimumSize(QtCore.QSize(0, 0))
        self.label_face.setMaximumSize(QtCore.QSize(16777215, 16777215))
        font = QtGui.QFont()
        font.setFamily("楷体")
        font.setPointSize(16)
        self.label_face.setFont(font)
        self.label_face.setLayoutDirection(QtCore.Qt.LeftToRight)
        self.label_face.setStyleSheet("background-color: rgb(192, 218, 255);")
        self.label_face.setAlignment(QtCore.Qt.AlignCenter)
        self.label_face.setObjectName("label_face")
        self.verticalLayout.addWidget(self.label_face)
        self.verticalLayout.setStretch(2, 5)
        self.horizontalLayout_2.addLayout(self.verticalLayout)
        MainWindow.setCentralWidget(self.centralwidget)
        self.actionGoogle_Translate = QtWidgets.QAction(MainWindow)
        self.actionGoogle_Translate.setObjectName("actionGoogle_Translate")
        self.actionHTML_type = QtWidgets.QAction(MainWindow)
        self.actionHTML_type.setObjectName("actionHTML_type")
        self.actionsoftware_version = QtWidgets.QAction(MainWindow)
        self.actionsoftware_version.setObjectName("actionsoftware_version")

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

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "Qt-Camera （思绪无限）"))
        self.label.setText(_translate("MainWindow", "Qt Camera - WuXian"))
        self.pushButton_open.setToolTip(_translate("MainWindow", "点击打开摄像头"))
        self.pushButton_open.setText(_translate("MainWindow", "打开摄像头"))
        self.pushButton_take.setToolTip(_translate("MainWindow", "点击拍照"))
        self.pushButton_take.setText(_translate("MainWindow", "拍照"))
        self.pushButton_close.setToolTip(_translate("MainWindow", "点击关闭摄像头"))
        self.pushButton_close.setText(_translate("MainWindow", "关闭摄像头"))
        self.label_face.setText(_translate("MainWindow", "<html><head/><body><p align=\"center\"><img src=\":/newPrefix/pic/Hint.png\"/><span style=\" font-size:28pt;\">点击打开摄像头</span><br/></p></body></html>"))
        self.actionGoogle_Translate.setText(_translate("MainWindow", "Google Translate"))
        self.actionHTML_type.setText(_translate("MainWindow", "HTML type"))
        self.actionsoftware_version.setText(_translate("MainWindow", "software version"))

import icon_rc

    以上代码实现的是界面设计，通过调用以上的界面类可实现界面与逻辑的分离，不过这里我们的程序比较简单，接下来直接在这个类中修改添加内部逻辑。

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3. 逻辑实现

3.1 开启摄像头

    为了方便使用上面的界面类，在Ui_MainWindow中添加一个初始化方法，申明需要用到的变量并为控件设置对应事件的槽函数。如下的四个方法分别是初始化方法、设置槽函数、点击‘打开摄像头’按钮的槽函数，及定时器到时槽函数。实现打开摄像头功能的思路是点击‘打开摄像头’按钮后开始计时，每隔一定时长刷新屏幕上的画面，间隔很短这样在点击后就能看到捕捉的连续画面。这部分代码如下：

    def __init__(self, MainWindow):
        self.timer_camera = QtCore.QTimer() # 定时器
        self.setupUi(MainWindow)
        self.retranslateUi(MainWindow)
        self.cap = cv2.VideoCapture() # 准备获取图像
        self.CAM_NUM = 0

        self.slot_init() # 设置槽函数


    def slot_init(self):
        # 设置槽函数
        self.pushButton_open.clicked.connect(self.button_open_camera_click)
        self.timer_camera.timeout.connect(self.show_camera)
        

    def button_open_camera_click(self):
        if self.timer_camera.isActive() == False:
            flag = self.cap.open(self.CAM_NUM)
            if flag == False:
                msg = QtWidgets.QMessageBox.warning(
                    self, u"Warning", u"请检测相机与电脑是否连接正确",
                    buttons=QtWidgets.QMessageBox.Ok,
                    defaultButton=QtWidgets.QMessageBox.Ok)
            else:
                self.timer_camera.start(30)


    def show_camera(self):
        flag, self.image = self.cap.read()

        self.image=cv2.flip(self.image, 1) # 左右翻转
        show = cv2.cvtColor(self.image, cv2.COLOR_BGR2RGB)

        showImage = QtGui.QImage(show.data, show.shape[1], show.shape[0], QtGui.QImage.Format_RGB888)
        self.label_face.setPixmap(QtGui.QPixmap.fromImage(showImage))
        self.label_face.setScaledContents(True)

    以上代码的主要思路是点击‘打开摄像头’按钮时调用该按钮的点击事件槽函数button_open_camera_click，在该函数中首先检查定时器是否已开启，若未开启则尝试打开摄像头，摄像头无法打开则弹出警告框，若摄像头存在让定时器开始运行。而定时器达到预设时长后则会执行定时器的槽函数show_camera，该函数将读取摄像头捕捉到的画面，在进行翻转、调整颜色形式后在label控件中显示。

3.2 拍照并保存照片

    上面一节实现在label中显示实时画面，那么如何实现拍照功能？基本思路是当点击‘拍照’按钮后，程序将当前帧的画面保存为‘png’文件，这时画面停止在当前帧，为了提醒用户照片已保存，可在画面中显示一个字符串如‘The picture have saved !’。只需在前面的Ui_MainWindow类中添加‘拍照’按钮的槽函数，下面是实现代码：

    def takePhoto(self):
        if self.timer_camera.isActive() != False:
            now_time = time.strftime('%Y-%m-%d-%H-%M-%S',time.localtime(time.time()))
            print(now_time)
            cv2.imwrite('pic_'+str(now_time)+'.png',self.image)

            cv2.putText(self.image, 'The picture have saved !',
                        (int(self.image.shape[1]/2-130), int(self.image.shape[0]/2)),
                        cv2.FONT_HERSHEY_SCRIPT_COMPLEX,
                        1.0, (255, 0, 0), 1)

            self.timer_camera.stop() # 停止计时

            show = cv2.cvtColor(self.image, cv2.COLOR_BGR2RGB)  # 左右翻转

            showImage = QtGui.QImage(show.data, show.shape[1], show.shape[0], QtGui.QImage.Format_RGB888)
            self.label_face.setPixmap(QtGui.QPixmap.fromImage(showImage))
            self.label_face.setScaledContents(True)

    该槽函数主要功能是将当前帧画面保存，使用OpenCV中的imerite函数保存图片文件，使用putText函数在图片中显示保存文件完成的提示信息，之后重新在label控件中显示带上文本标记的图像，实现效果如下图所示。

3.3 关闭摄像头

    关闭摄像头功能实现上比较简单，只需在判断摄像头是否开启后根据情况停止获取摄像头画面，停止计时及清除显示界面的画面就可以了。同样的在Ui_MainWindow类中添加‘关闭摄像头’按钮的槽函数，其实现代码如下：

 def closeEvent(self):
        if self.timer_camera.isActive() != False:
            ok = QtWidgets.QPushButton()
            cacel = QtWidgets.QPushButton()
			
			# 提示信息
            msg = QtWidgets.QMessageBox(QtWidgets.QMessageBox.Warning, u"关闭", u"是否关闭！")
            msg.addButton(ok,QtWidgets.QMessageBox.ActionRole)
            msg.addButton(cacel, QtWidgets.QMessageBox.RejectRole)
            ok.setText(u'确定')
            cacel.setText(u'取消')

            if msg.exec_() != QtWidgets.QMessageBox.RejectRole:
				# 停止获取画面
                if self.cap.isOpened():
                    self.cap.release()
                if self.timer_camera.isActive():
                    self.timer_camera.stop()
                # 使label重新恢复开始时的提示
                self.label_face.setText("<html><head/><body><p align=\"center\"><img src=\":/newPrefix/pic/Hint.png\"/><span style=\" font-size:28pt;\">点击打开摄像头</span><br/></p></body></html>")

    在点击‘关闭摄像头’按钮后，如摄像头在打开状态，弹出一个QMessageBox提示框提示一个确定关闭信息，用户选择确定后停止获取画面、停止计时并重新显示label的提示信息，运行结果如下图所示。

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4. 完整代码

    其中用到的图片文件来自博主创建的qrc资源文件中，可修改代码重新选择图片或在博主的个人下载资源页面下载源文件。为了方面使用，这里贴出全部的完整代码，以供参考：

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

# 思绪无限
# 博客网址：https://wuxian.blog.csdn.net/
# Created by: PyQt5 UI code generator 5.11.3
# 运行程序需安装：pyqt5、OpenCV-python


from PyQt5 import QtCore, QtGui, QtWidgets
from sys import argv,exit
from PyQt5.QtWidgets import QApplication,QMainWindow
import icon_rc
import time
import cv2

class Ui_MainWindow(object):
    def __init__(self, MainWindow):

        self.timer_camera = QtCore.QTimer() # 定时器
        self.setupUi(MainWindow)
        self.retranslateUi(MainWindow)
        self.cap = cv2.VideoCapture() # 准备获取图像
        self.CAM_NUM = 0

        self.slot_init() # 设置槽函数




    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.setWindowModality(QtCore.Qt.NonModal)
        MainWindow.resize(765, 645)
        MainWindow.setMinimumSize(QtCore.QSize(765, 645))
        MainWindow.setMaximumSize(QtCore.QSize(16777215, 16777215))
        icon = QtGui.QIcon()
        icon.addPixmap(QtGui.QPixmap(":/newPrefix/pic/pai.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        MainWindow.setWindowIcon(icon)
        MainWindow.setToolTip("")
        MainWindow.setAutoFillBackground(False)
        MainWindow.setTabShape(QtWidgets.QTabWidget.Rounded)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.horizontalLayout_2 = QtWidgets.QHBoxLayout(self.centralwidget)
        self.horizontalLayout_2.setObjectName("horizontalLayout_2")
        self.verticalLayout = QtWidgets.QVBoxLayout()
        self.verticalLayout.setObjectName("verticalLayout")
        self.label = QtWidgets.QLabel(self.centralwidget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.MinimumExpanding, QtWidgets.QSizePolicy.Preferred)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.label.sizePolicy().hasHeightForWidth())
        self.label.setSizePolicy(sizePolicy)
        font = QtGui.QFont()
        font.setFamily("华文隶书")
        font.setPointSize(20)
        self.label.setFont(font)
        self.label.setAlignment(QtCore.Qt.AlignCenter)
        self.label.setObjectName("label")
        self.verticalLayout.addWidget(self.label)
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setSizeConstraint(QtWidgets.QLayout.SetDefaultConstraint)
        self.horizontalLayout.setContentsMargins(-1, 50, -1, -1)
        self.horizontalLayout.setSpacing(0)
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.pushButton_open = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_open.setMinimumSize(QtCore.QSize(100, 40))
        self.pushButton_open.setMaximumSize(QtCore.QSize(120, 40))
        font = QtGui.QFont()
        font.setFamily("华文彩云")
        font.setPointSize(12)
        self.pushButton_open.setFont(font)
        icon1 = QtGui.QIcon()
        icon1.addPixmap(QtGui.QPixmap(":/newPrefix/pic/g1.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.pushButton_open.setIcon(icon1)
        self.pushButton_open.setObjectName("pushButton_open")
        self.horizontalLayout.addWidget(self.pushButton_open)
        self.pushButton_take = QtWidgets.QPushButton(self.centralwidget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.pushButton_take.sizePolicy().hasHeightForWidth())
        self.pushButton_take.setSizePolicy(sizePolicy)
        self.pushButton_take.setMinimumSize(QtCore.QSize(100, 40))
        self.pushButton_take.setMaximumSize(QtCore.QSize(100, 40))
        font = QtGui.QFont()
        font.setFamily("华文彩云")
        font.setPointSize(12)
        self.pushButton_take.setFont(font)
        self.pushButton_take.setIcon(icon)
        self.pushButton_take.setObjectName("pushButton_take")
        self.horizontalLayout.addWidget(self.pushButton_take)
        self.pushButton_close = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_close.setMinimumSize(QtCore.QSize(100, 40))
        self.pushButton_close.setMaximumSize(QtCore.QSize(130, 40))
        font = QtGui.QFont()
        font.setFamily("华文彩云")
        font.setPointSize(12)
        self.pushButton_close.setFont(font)
        icon2 = QtGui.QIcon()
        icon2.addPixmap(QtGui.QPixmap(":/newPrefix/pic/down.png"), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        self.pushButton_close.setIcon(icon2)
        self.pushButton_close.setObjectName("pushButton_close")
        self.horizontalLayout.addWidget(self.pushButton_close)
        self.horizontalLayout.setStretch(0, 1)
        self.horizontalLayout.setStretch(1, 1)
        self.horizontalLayout.setStretch(2, 1)
        self.verticalLayout.addLayout(self.horizontalLayout)
        self.label_face = QtWidgets.QLabel(self.centralwidget)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Expanding)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.label_face.sizePolicy().hasHeightForWidth())
        self.label_face.setSizePolicy(sizePolicy)
        self.label_face.setMinimumSize(QtCore.QSize(0, 0))
        self.label_face.setMaximumSize(QtCore.QSize(16777215, 16777215))
        font = QtGui.QFont()
        font.setFamily("楷体")
        font.setPointSize(16)
        self.label_face.setFont(font)
        self.label_face.setLayoutDirection(QtCore.Qt.LeftToRight)
        self.label_face.setStyleSheet("background-color: rgb(192, 218, 255);")
        self.label_face.setAlignment(QtCore.Qt.AlignCenter)
        self.label_face.setObjectName("label_face")
        self.verticalLayout.addWidget(self.label_face)
        self.verticalLayout.setStretch(2, 5)
        self.horizontalLayout_2.addLayout(self.verticalLayout)
        MainWindow.setCentralWidget(self.centralwidget)


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

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "Qt-Camera （思绪无限）"))
        self.label.setText(_translate("MainWindow", "Qt Camera - WuXian"))
        self.pushButton_open.setToolTip(_translate("MainWindow", "点击打开摄像头"))
        self.pushButton_open.setText(_translate("MainWindow", "打开摄像头"))
        self.pushButton_take.setToolTip(_translate("MainWindow", "点击拍照"))
        self.pushButton_take.setText(_translate("MainWindow", "拍照"))
        self.pushButton_close.setToolTip(_translate("MainWindow", "点击关闭摄像头"))
        self.pushButton_close.setText(_translate("MainWindow", "关闭摄像头"))
        self.label_face.setText(_translate("MainWindow", "<html><head/><body><p align=\"center\"><img src=\":/newPrefix/pic/Hint.png\"/><span style=\" font-size:28pt;\">点击打开摄像头</span><br/></p></body></html>"))


    def slot_init(self):
        # 设置槽函数
        self.pushButton_open.clicked.connect(self.button_open_camera_click)
        self.timer_camera.timeout.connect(self.show_camera)
        self.pushButton_close.clicked.connect(self.closeEvent)
        self.pushButton_take.clicked.connect(self.takePhoto)



    def button_open_camera_click(self):
        if self.timer_camera.isActive() == False:
            flag = self.cap.open(self.CAM_NUM)
            if flag == False:
                msg = QtWidgets.QMessageBox.warning(
                    self, u"Warning", u"请检测相机与电脑是否连接正确",
                    buttons=QtWidgets.QMessageBox.Ok,
                    defaultButton=QtWidgets.QMessageBox.Ok)
            else:
                self.timer_camera.start(30)



    def show_camera(self):
        flag, self.image = self.cap.read()

        self.image=cv2.flip(self.image, 1) # 左右翻转
        show = cv2.cvtColor(self.image, cv2.COLOR_BGR2RGB)

        showImage = QtGui.QImage(show.data, show.shape[1], show.shape[0], QtGui.QImage.Format_RGB888)
        self.label_face.setPixmap(QtGui.QPixmap.fromImage(showImage))
        self.label_face.setScaledContents(True)


    def takePhoto(self):
        if self.timer_camera.isActive() != False:
            now_time = time.strftime('%Y-%m-%d-%H-%M-%S',time.localtime(time.time()))
            print(now_time)
            cv2.imwrite('pic_'+str(now_time)+'.png',self.image)

            cv2.putText(self.image, 'The picture have saved !',
                        (int(self.image.shape[1]/2-130), int(self.image.shape[0]/2)),
                        cv2.FONT_HERSHEY_SCRIPT_COMPLEX,
                        1.0, (255, 0, 0), 1)

            self.timer_camera.stop()

            show = cv2.cvtColor(self.image, cv2.COLOR_BGR2RGB)  # 左右翻转

            showImage = QtGui.QImage(show.data, show.shape[1], show.shape[0], QtGui.QImage.Format_RGB888)
            self.label_face.setPixmap(QtGui.QPixmap.fromImage(showImage))
            self.label_face.setScaledContents(True)



    def closeEvent(self):
        if self.timer_camera.isActive() != False:
            ok = QtWidgets.QPushButton()
            cacel = QtWidgets.QPushButton()

            msg = QtWidgets.QMessageBox(QtWidgets.QMessageBox.Warning, u"关闭", u"是否关闭！")

            msg.addButton(ok,QtWidgets.QMessageBox.ActionRole)
            msg.addButton(cacel, QtWidgets.QMessageBox.RejectRole)
            ok.setText(u'确定')
            cacel.setText(u'取消')

            if msg.exec_() != QtWidgets.QMessageBox.RejectRole:

                if self.cap.isOpened():
                    self.cap.release()
                if self.timer_camera.isActive():
                    self.timer_camera.stop()
                self.label_face.setText("<html><head/><body><p align=\"center\"><img src=\":/newPrefix/pic/Hint.png\"/><span style=\" font-size:28pt;\">点击打开摄像头</span><br/></p></body></html>")



if __name__ == '__main__':
    app = QApplication(argv)

    window = QMainWindow()
    ui = Ui_MainWindow(window)

    window.show()
    exit(app.exec_())

---

【下载链接】
    若您想获得博文中涉及的全部程序文件（包括图片,UI, py, qrc文件等），这里已打包上传至博主的CSDN下载资源中（里面文件情况如下图所示），下载后运行run_Camera.py文件即可运行。文件下载链接如下：

CSDN下载链接：博文中涉及的完整程序文件

也可点击文末卡片关注“AI技术研究与分享”，回复“QC20190602”即可获取详情。

---

5. 结束语

    由于博主能力有限，博文中提及的方法与代码即使经过测试，也难免会有疏漏之处。希望您能热心指出其中的错误，以便下次修改时能以一个更完美更严谨的样子，呈现在大家面前。同时如果有更好的实现方法也请您不吝赐教。

    大家的点赞和关注是博主最大的动力，如果您想要获取博文中的完整代码文件，可通过C币或积分下载，没有C币或积分的朋友可在关注、点赞博文后在评论区留下邮箱，我会在第一时间发送给您。

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人工智能博主，机器学习及机器视觉爱好者，公众号主及B站UP主，专注专业知识整理与项目总结约稿、软件项目开发、原理指导请联系微信：sixuwuxian（备注来意），邮箱：sixuwuxian@aliyun.com，微信公众号：“AI技术研究与分享”。