图像行人检测GUI代码

以下是一个基于PyQt5和OpenCV的图像行人检测GUI代码示例：

import sys
import cv2
from PyQt5.QtGui import QImage, QPixmap
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QApplication, QDialog, QFileDialog
from ui_mainwindow import Ui_MainWindow

class MainWindow(QDialog):
    def __init__(self):
        super().__init__()

        # 初始化UI
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

        # 绑定事件
        self.ui.pushButton.clicked.connect(self.open_image)
        self.ui.pushButton_2.clicked.connect(self.detect_people)

        self.image = None

    def open_image(self):
        # 打开图像
        filename, _ = QFileDialog.getOpenFileName(self, "Open Image", "", "Image Files (*.png *.jpg *.bmp)")
        if filename:
            self.image = cv2.imread(filename)
            self.display_image(self.image)

    def detect_people(self):
        # 行人检测
        if self.image is not None:
            hog = cv2.HOGDescriptor()
            hog.setSVMDetector(cv2.HOGDescriptor_getDefaultPeopleDetector())

            # 缩放图像以提高检测速度
            scale = 1.05
            min_neighbors = 3
            flags = cv2.CASCADE_SCALE_IMAGE
            gray = cv2.cvtColor(self.image, cv2.COLOR_BGR2GRAY)
            rects, _ = hog.detectMultiScale(gray, scale, minNeighbors=min_neighbors,flags=flags)

            # 在图像上绘制检测框
            for (x, y, w, h) in rects:
                cv2.rectangle(self.image, (x, y), (x+w, y+h), (0, 0, 255), 2)

            # 显示结果
            self.display_image(self.image)

    def display_image(self, image):
        # 将OpenCV图像转换为QPixmap
        qimage = QImage(image.data, image.shape[1], image.shape[0], QImage.Format_RGB888)
        qpixmap = QPixmap.fromImage(qimage)

        # 显示图像
        self.ui.label.setPixmap(qpixmap)
        self.ui.label.setAlignment(Qt.AlignCenter)

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

此代码使用了一个名为`ui_mainwindow.py`的UI文件。下面是该文件的内容：

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(640, 480)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setText("")
        self.label.setObjectName("label")
        self.verticalLayout.addWidget(self.label)
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.horizontalLayout.addWidget(self.pushButton)
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setObjectName("pushButton_2")
        self.horizontalLayout.addWidget(self.pushButton_2)
        self.verticalLayout.addLayout(self.horizontalLayout)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 640, 26))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

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

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "Open Image"))
        self.pushButton_2.setText(_translate("MainWindow", "Detect People"))

请注意，此示例仅用于演示目的，实际应用中可能需要进行更多的错误处理和性能优化。