Python 3. Python pyqt5 opencv 摄像头软件 相机 软件 有录像保存视频，保存图片，识别人脸位置功能

疫情期间的闭门造车工程，借此机会初入图像领域

一直打算边学图像，边做一个图像学习的软件，但是越来越发现没有必要，因为感觉程序直接裸跑验证就行了，没有必要封装成一个软件，于是删减删减删减，精简功能后达到下图效果，源码下图有，自己配好环境可以运行，工程文件打包后期上传

功能简述：

1.打开相机，显示相机图像

2.关闭相机显示

3.保存录像

4.截屏当前视频，保存图片

5.识别视频中的人脸位置画上方框

环境陈述（默认开发环境已配好）：

开发系统：Linux

运行系统：Linux，Windows10

开发软件：Python3，Qt designer ，pycharm

打包工具：pyinstaller

打包环境：win10

程序工程文件夹：

打包后的运行环境：

其中image1和output是运行产生的，其他为依赖文件

工程建立，等等流程同https://blog.csdn.net/qq_36071362/article/details/104170846，不做具体记录，只记录注意事项

1.依赖文件打包：打包后找齐依赖文件和exe放在同一个目录下，可以打包时一起加入（修改spec文件），但是一般不这么干，                              试了试没成功

2.依赖文件：需要人脸识别器，pic1是相机初始图片，。。。dll为OpenCV保存视频必须的，位置在opencv的安装路径中，否则                       AVI视频不能正常保存

3.录像计时不准，随便诌了一个，，懒得找了

4.打包指令：pyinstaller --hidden-import=PyQt5 -w -F cam_minisoft_ser.py -p cam_minisoft_ser.py

下面贴出服务函数源码

from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QMessageBox
from cam_minisoft import Ui_Form
from PyQt5.QtWidgets import QApplication, QMainWindow, QGridLayout
from PyQt5.QtCore import QTimer, QCoreApplication
import numpy as np
from PyQt5.QtGui import QPixmap
import sys
import cv2
import qimage2ndarray
import time
cap = cv2.VideoCapture(0)
g_img = cv2.imread('pic1.PNG')

face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('output.avi', fourcc, 20.0, (640, 480))


class Pyqt5_cam(QtWidgets.QWidget, Ui_Form):  # 创建画板，继承自FigureCanvas类
    def __init__(self):
        super(Pyqt5_cam, self).__init__()
        self.setupUi(self)
        self.init()
        self.setWindowTitle("MLW_Cam")

        self.Timer = QTimer()
        self.Timer.timeout.connect(self.DispImg)
        # self.Timer.start(1)

        self.s_flag = 0
        self.count_time = 0
        self.start_time = 0
        self.all_time = 0

        # 显示"打开摄像头"前的图像
        global g_img
        g_img = cv2.cvtColor(g_img, cv2.COLOR_BGR2RGB)
        qimg = qimage2ndarray.array2qimage(g_img)
        self.DispLb.setPixmap(QPixmap(qimg))
        self.DispLb.show()

    # 把按钮等控件和函数对应起来
    def init(self):
        # 串口检测按钮
        self.button1.clicked.connect(self.start_cam)
        self.button2.clicked.connect(self.close_cam)
        self.button3.clicked.connect(self.save_video)
        self.button4.clicked.connect(self.stop_save_video)
        self.button5.clicked.connect(self.save_pic)

    def start_cam(self):
        # 重新打开摄像头
        cap.open(0)
        self.Timer.start(1)

    def close_cam(self):
        # 关闭摄像头
        cap.release()
        self.count_time = 0
        self.Timer.stop()
        self.all_time = 0

    def save_video(self):
        if self.count_time > 0: # 相机打开后才能录像
            self.s_flag = 1
            self.state_label.setText(" 正在录像:")
            self.count_time = 0

    def stop_save_video(self):
        if self.s_flag == 1:
            self.s_flag = 0
            self.state_label.setText(" 录像停止")

    def save_pic(self):
        sucess, g_img = cap.read()
        cv2.imwrite("image1.jpg", g_img)


    def DispImg(self):
        global g_img
        self.count_time += 1
        if self.count_time >= 6000:
            self.count_time = 0
        sucess, g_img = cap.read()
        # success, g_img = self.camera.read()
        # cv2.imshow('img', g_img)
        gray = cv2.cvtColor(g_img, cv2.COLOR_BGR2GRAY)

        # 绘制人脸周围的矩形
        faces = face_cascade.detectMultiScale(gray, scaleFactor=1.2, minNeighbors=5)
        for (x, y, w, h) in faces:
            g_img = cv2.rectangle(g_img, (x, y), (x+w, y+h), (255, 0, 0), 2)

        # 显示计时时间
        if self.s_flag == 1:
            out.write(g_img)
            if self.count_time >= 23:
                self.all_time += 1
                self.count_time = 0
            self.state_label_2.setText(str(self.all_time))

        g_img = cv2.cvtColor(g_img, cv2.COLOR_BGR2RGB)
        qimg = qimage2ndarray.array2qimage(g_img)
        self.DispLb.setPixmap(QPixmap(qimg))
        self.DispLb.show()


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)  # 实例化一个应用对象
    myshow = Pyqt5_cam()
    myshow.show()  # 让控件在桌面上显示出来。控件在内存里创建，之后才能在显示器上显示出来。
    sys.exit(app.exec_())  # 程序一直循环运行到主窗口被关闭

下面贴出ui文件转换完的py文件

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

# Form implementation generated from reading ui file 'cam_minisoft.ui'
#
# Created by: PyQt5 UI code generator 5.5.1
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(983, 892)
        self.button3 = QtWidgets.QPushButton(Form)
        self.button3.setGeometry(QtCore.QRect(370, 840, 81, 33))
        self.button3.setObjectName("button3")
        self.button1 = QtWidgets.QPushButton(Form)
        self.button1.setGeometry(QtCore.QRect(40, 840, 81, 33))
        self.button1.setObjectName("button1")
        self.button2 = QtWidgets.QPushButton(Form)
        self.button2.setGeometry(QtCore.QRect(140, 840, 81, 33))
        self.button2.setObjectName("button2")
        self.button5 = QtWidgets.QPushButton(Form)
        self.button5.setGeometry(QtCore.QRect(840, 840, 111, 33))
        self.button5.setObjectName("button5")
        self.DispLb = QtWidgets.QLabel(Form)
        self.DispLb.setGeometry(QtCore.QRect(30, 30, 921, 791))
        self.DispLb.setText("")
        self.DispLb.setScaledContents(True)
        self.DispLb.setObjectName("DispLb")
        self.button4 = QtWidgets.QPushButton(Form)
        self.button4.setGeometry(QtCore.QRect(470, 840, 81, 33))
        self.button4.setObjectName("button4")
        self.state_label = QtWidgets.QLabel(Form)
        self.state_label.setGeometry(QtCore.QRect(560, 839, 71, 31))
        self.state_label.setObjectName("state_label")
        self.state_label_2 = QtWidgets.QLabel(Form)
        self.state_label_2.setGeometry(QtCore.QRect(630, 840, 31, 31))
        self.state_label_2.setText("")
        self.state_label_2.setObjectName("state_label_2")

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

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.button3.setText(_translate("Form", "开始录像"))
        self.button1.setText(_translate("Form", "打开相机"))
        self.button2.setText(_translate("Form", "关闭相机"))
        self.button5.setText(_translate("Form", "保存图片"))
        self.button4.setText(_translate("Form", "停止录像"))
        self.state_label.setText(_translate("Form", "未在录像"))