智能停车场系统：基于 pyqt5，opencv，MySQL

这是一个相对复杂的项目，需要使用多个技术和模块来实现。以下是一个简单的示例代码，可以使用 Python 和 PyQt 实现一个简单的智能停车场管理系统。

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QLabel, QLineEdit, QPushButton, QMessageBox, QFileDialog
from PyQt5.QtGui import QPixmap
import mysql.connector
import cv2
import pytesseract
import datetime

class LoginWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("智能停车场管理系统-登录")
        self.setGeometry(100, 100, 600, 400)

        self.central_widget = QWidget(self)
        self.setCentralWidget(self.central_widget)

        self.username_label = QLabel("用户名:", self.central_widget)
        self.username_label.move(150, 100)
        self.username_input = QLineEdit(self.central_widget)
        self.username_input.move(220, 100)

        self.password_label = QLabel("密码:", self.central_widget)
        self.password_label.move(150, 150)
        self.password_input = QLineEdit(self.central_widget)
        self.password_input.move(220, 150)
        self.password_input.setEchoMode(QLineEdit.Password)

        self.login_button = QPushButton("登录", self.central_widget)
        self.login_button.move(250, 200)
        self.login_button.clicked.connect(self.login)

    def login(self):
        username = self.username_input.text()
        password = self.password_input.text()
        if username == "admin" and password == "123456":
            self.hide()
            self.main_window = MainWindow()
            self.main_window.show()
        else:
            QMessageBox.warning(self, "错误", "用户名或密码错误！")

class RegisterWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("智能停车场管理系统-注册")
        self.setGeometry(100, 100, 600, 400)

        self.central_widget = QWidget(self)
        self.setCentralWidget(self.central_widget)

        self.username_label = QLabel("用户名:", self.central_widget)
        self.username_label.move(150, 100)
        self.username_input = QLineEdit(self.central_widget)
        self.username_input.move(220, 100)

        self.password_label = QLabel("密码:", self.central_widget)
        self.password_label.move(150, 150)
        self.password_input = QLineEdit(self.central_widget)
        self.password_input.move(220, 150)
        self.password_input.setEchoMode(QLineEdit.Password)

        self.confirm_password_label = QLabel("确认密码:", self.central_widget)
        self.confirm_password_label.move(150, 200)
        self.confirm_password_input = QLineEdit(self.central_widget)
        self.confirm_password_input.move(220, 200)
        self.confirm_password_input.setEchoMode(QLineEdit.Password)

        self.register_button = QPushButton("注册", self.central_widget)
        self.register_button.move(250, 250)
        self.register_button.clicked.connect(self.register)

    def register(self):
        username = self.username_input.text()
        password = self.password_input.text()
        confirm_password = self.confirm_password_input.text()
        if password != confirm_password:
            QMessageBox.warning(self, "错误", "两次输入的密码不一致！")
        else:
            mydb = mysql.connector.connect(
                host="localhost",
                user="username",
                password="password",
                database="dbname"
            )
            mycursor = mydb.cursor()
            sql = "INSERT INTO users (username, password) VALUES (%s, %s)"
            val = (username, password)
            mycursor.execute(sql, val)
            mydb.commit()
            QMessageBox.information(self, "成功", "注册成功！")
            self.hide()

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("智能停车场管理系统-主页")
        self.setGeometry(100, 100, 800, 600)

        self.central_widget = QWidget(self)
        self.setCentralWidget(self.central_widget)

        self.camera_label = QLabel(self.central_widget)
        self.camera_label.setGeometry(50, 50, 640, 480)

        self.start_button = QPushButton("开始", self.central_widget)
        self.start_button.setGeometry(50, 550, 100, 30)
        self.start_button.clicked.connect(self.start_camera)

        self.stop_button = QPushButton("停止", self.central_widget)
        self.stop_button.setGeometry(200, 550, 100, 30)
        self.stop_button.clicked.connect(self.stop_camera)

        self.capture_button = QPushButton("拍照", self.central_widget)
        self.capture_button.setGeometry(350, 550, 100, 30)
        self.capture_button.clicked.connect(self.capture_image)

        self.plate_label = QLabel("车牌号码:", self.central_widget)
        self.plate_label.setGeometry(500, 550, 100, 30)
        self.plate_input = QLineEdit(self.central_widget)
        self.plate_input.setGeometry(600, 550, 100, 30)

        self.in_button = QPushButton("入库", self.central_widget)
        self.in_button.setGeometry(50, 500, 100, 30)
        self.in_button.clicked.connect(self.in_park)

        self.out_button = QPushButton("出库", self.central_widget)
        self.out_button.setGeometry(200, 500, 100, 30)
        self.out_button.clicked.connect(self.out_park)

        self.logout_button = QPushButton("注销", self.central_widget)
        self.logout_button.setGeometry(650, 20, 100, 30)
        self.logout_button.clicked.connect(self.logout)

        self.timer = None
        self.cap = None
        self.is_camera_running = False
        self.image_count = 0

    def start_camera(self):
        self.cap = cv2.VideoCapture(0)
        self.is_camera_running = True
        self.timer = self.central_widget.startTimer(20)

    def stop_camera(self):
        if self.cap:
            self.cap.release()
            self.is_camera_running = False
            self.timer = None
            self.camera_label.clear()

    def capture_image(self):
        if self.is_camera_running:
            ret, frame = self.cap.read()
            if ret:
                self.image_count += 1
                filename = "image_{}.jpg".format(self.image_count)
                cv2.imwrite(filename, frame)
                self.camera_label.setPixmap(QPixmap(filename))

                img = cv2.imread(filename)
                gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
                gray = cv2.medianBlur(gray, 3)
                gray = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY + cv2.THRESH_OTSU)[1]
                plate = pytesseract.image_to_string(gray, config="--psm 7")
                self.plate_input.setText(plate.strip())

    def in_park(self):
        plate = self.plate_input.text()
        if plate:
            mydb = mysql.connector.connect(
                host="localhost",
                user="username",
                password="password",
                database="dbname"
            )
            mycursor = mydb.cursor()
            now = datetime.datetime.now()
            sql = "INSERT INTO park_record (plate, in_time) VALUES (%s, %s)"
            val = (plate, now.strftime("%Y-%m-%d %H:%M:%S"))
            mycursor.execute(sql, val)
            mydb.commit()
            QMessageBox.information(self, "成功", "车辆已入库！")
            self.plate_input.clear()

    def out_park(self):
        plate = self.plate_input.text()
        if plate:
            mydb = mysql.connector.connect(
                host="localhost",
                user="username",
                password="password",
                database="dbname"
            )
            mycursor = mydb.cursor()
            now = datetime.datetime.now()
            sql = "UPDATE park_record SET out_time = %s WHERE plate = %s AND out_time IS NULL"
            val = (now.strftime("%Y-%m-%d %H:%M:%S"), plate)
            mycursor.execute(sql, val)
            mydb.commit()
            if mycursor.rowcount > 0:
                QMessageBox.information(self, "成功", "车辆已出库！")
                self.plate_input.clear()
            else:
                QMessageBox.warning(self, "错误", "车牌号码不存在或已出库！")

    def logout(self):
        self.hide()
        self.login_window = LoginWindow()
        self.login_window.show()

    def timerEvent(self, event):
        if self.is_camera_running:
            ret, frame = self.cap.read()
            if ret:
                frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
                h, w, ch = frame.shape
                bytesPerLine = ch * w
                qImg = QImage(frame.data, w, h, bytesPerLine, QImage.Format_RGB888)
                self.camera_label.setPixmap(QPixmap.fromImage(qImg))

if __name__ == '__main__':
    app = QApplication(sys.argv)
    login_window = LoginWindow()
    login_window.show()
    sys.exit(app.exec_())

在上面的示例代码中，我们使用了 PyQt5 库来创建 GUI 界面，使用了 OpenCV 库来读取摄像头数据，并使用了 PyTesseract 库来识别车牌号码。同时，我们使用了 MySQL 数据库来存储车辆入库和出库记录。在程序运行时，首先会显示登录界面，用户可以输入用户名和密码来登录系统。如果登录成功，程序将转到主页界面，用户可以在主页界面中开启摄像头、拍照、识别车牌、入库或出库车辆，并可以注销用户退出系统。在程序中，我们使用了多个类来分别实现不同的功能，使代码更加清晰和易于维护。文章来源地址https://www.toymoban.com/news/detail-515901.html

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