图片中行人检测GUI代码

以下是行人检测GUI代码的示例：

import cv2
import tkinter as tk
from tkinter import filedialog
from PIL import Image, ImageTk

# Load pedestrian detection cascade classifier
pedestrian_cascade = cv2.CascadeClassifier('haarcascade_fullbody.xml')

class PedestrianDetectionGUI:
    def __init__(self, master):
        self.master = master
        master.title("Pedestrian Detection")

        # Create buttons
        self.select_image_button = tk.Button(master, text="Select Image", command=self.select_image)
        self.detect_pedestrian_button = tk.Button(master, text="Detect Pedestrian", command=self.detect_pedestrian)

        # Create canvas for displaying image
        self.canvas = tk.Canvas(master, width=400, height=400)

        # Pack buttons and canvas
        self.select_image_button.pack()
        self.detect_pedestrian_button.pack()
        self.canvas.pack()

        # Initialize variables
        self.image = None
        self.image_path = None

    def select_image(self):
        # Open file dialog to select image
        self.image_path = filedialog.askopenfilename()

        # Load image and display on canvas
        self.image = Image.open(self.image_path)
        self.image = self.image.resize((400, 400), Image.ANTIALIAS)
        self.image_tk = ImageTk.PhotoImage(self.image)
        self.canvas.create_image(0, 0, anchor='nw', image=self.image_tk)

    def detect_pedestrian(self):
        if self.image is not None:
            # Load image in grayscale
            img = cv2.imread(self.image_path, cv2.IMREAD_GRAYSCALE)

            # Detect pedestrians using cascade classifier
            pedestrians = pedestrian_cascade.detectMultiScale(img, 1.3, 5)

            # Draw rectangles around detected pedestrians
            for (x, y, w, h) in pedestrians:
                cv2.rectangle(img, (x, y), (x+w, y+h), (0, 0, 255), 2)

            # Convert image back to RGB and display on canvas
            img = cv2.cvtColor(img, cv2.COLOR_GRAY2RGB)
            img = Image.fromarray(img)
            img = img.resize((400, 400), Image.ANTIALIAS)
            img_tk = ImageTk.PhotoImage(img)
            self.canvas.create_image(0, 0, anchor='nw', image=img_tk)
        else:
            # Display error message if no image is selected
            tk.messagebox.showerror("Error", "No image selected.")

# Create GUI window
root = tk.Tk()
gui = PedestrianDetectionGUI(root)
root.mainloop()

这个示例代码使用 `tkinter` 模块创建了一个简单的 GUI 窗口，其中包括两个按钮和一个画布。当用户点击“Select Image”按钮时，程序会打开文件对话框，让用户选择一张图片。当用户点击“Detect Pedestrian”按钮时，程序会使用 Haar 级联分类器检测行人，并在画布上显示检测结果。