用PYQT写一个图像处理页面

以下是一个简单的图像处理页面示例，使用Python和PyQt实现。

import sys
import os
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QPushButton, QFileDialog, QVBoxLayout
from PyQt5.QtGui import QPixmap
from PyQt5.QtCore import Qt
import cv2

class ImageProcessor(QWidget):
    def __init__(self):
        super().__init__()

        # 设置窗口大小和标题
        self.setWindowTitle("Image Processor")
        self.setGeometry(100, 100, 600, 400)

        # 创建标签和按钮
        self.label = QLabel(self)
        self.label.setAlignment(Qt.AlignCenter)
        self.button1 = QPushButton("打开图片", self)
        self.button2 = QPushButton("灰度化", self)
        self.button3 = QPushButton("反转", self)
        self.button4 = QPushButton("保存图片", self)

        # 创建垂直布局
        layout = QVBoxLayout()
        layout.addWidget(self.label)
        layout.addWidget(self.button1)
        layout.addWidget(self.button2)
        layout.addWidget(self.button3)
        layout.addWidget(self.button4)

        # 将布局设置到窗口
        self.setLayout(layout)

        # 绑定按钮点击事件
        self.button1.clicked.connect(self.open_image)
        self.button2.clicked.connect(self.grayscale)
        self.button3.clicked.connect(self.invert)
        self.button4.clicked.connect(self.save_image)

        # 初始化变量
        self.image_path = ""
        self.image = None

    def open_image(self):
        # 打开文件对话框，选择图片
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog
        file_path, _ = QFileDialog.getOpenFileName(self, "打开图片", "", "All Files (*);;Image Files (*.png *.jpg *.jpeg *.bmp)", options=options)
        if file_path:
            # 加载图片并显示
            self.image_path = file_path
            self.image = cv2.imread(self.image_path)
            pixmap = QPixmap(self.image_path)
            self.label.setPixmap(pixmap)

    def grayscale(self):
        # 将图片转换为灰度图并显示
        if self.image is not None:
            gray = cv2.cvtColor(self.image, cv2.COLOR_BGR2GRAY)
            self.image = gray
            height, width = gray.shape
            bytes_per_line = width
            q_image = QImage(gray.data, width, height, bytes_per_line, QImage.Format_Grayscale8)
            pixmap = QPixmap.fromImage(q_image)
            self.label.setPixmap(pixmap)

    def invert(self):
        # 反转图片并显示
        if self.image is not None:
            inv = cv2.bitwise_not(self.image)
            self.image = inv
            height, width, channel = inv.shape
            bytes_per_line = 3 * width
            q_image = QImage(inv.data, width, height, bytes_per_line, QImage.Format_RGB888)
            pixmap = QPixmap.fromImage(q_image)
            self.label.setPixmap(pixmap)

    def save_image(self):
        # 保存图片到文件
        if self.image is not None and self.image_path:
            file_path, _ = QFileDialog.getSaveFileName(self, "保存图片", os.path.splitext(self.image_path)[0] + "_processed.jpg", "JPEG (*.jpg *.jpeg)")
            if file_path:
                cv2.imwrite(file_path, self.image)

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

这个页面包括以下功能：

- 打开图片按钮：打开文件对话框，选择一张图片并显示在标签中。
- 灰度化按钮：将图片转换为灰度图并显示在标签中。
- 反转按钮：将图片颜色反转并显示在标签中。
- 保存图片按钮：将处理后的图片保存到文件。

这是一个简单的示例，您可以根据自己的需求对页面进行更改和扩展。