在pyqt中显示摄像头

pip install opencv-python

import sys
import cv2
from PyQt5.QtCore import Qt, QTimer
from PyQt5.QtGui import QImage, QPixmap
from PyQt5.QtWidgets import QApplication, QLabel, QWidget

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

        self.camera = cv2.VideoCapture(0)  # 打开摄像头
        self.camera.set(cv2.CAP_PROP_FRAME_WIDTH, 640)  # 设置摄像头宽度
        self.camera.set(cv2.CAP_PROP_FRAME_HEIGHT, 480)  # 设置摄像头高度

        self.label = QLabel(self)
        self.label.setAlignment(Qt.AlignCenter)

        self.timer = QTimer(self)
        self.timer.timeout.connect(self.update_frame)
        self.timer.start(30)  # 每30毫秒更新一帧

    def update_frame(self):
        ret, frame = self.camera.read()  # 读取摄像头帧
        if ret:
            rgb_image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)  # 将BGR图像转换为RGB图像
            h, w, ch = rgb_image.shape
            bytes_per_line = ch * w
            q_image = QImage(rgb_image.data, w, h, bytes_per_line, QImage.Format_RGB888)
            pixmap = QPixmap.fromImage(q_image)
            self.label.setPixmap(pixmap.scaled(self.label.size(), Qt.KeepAspectRatio, Qt.SmoothTransformation))

    def closeEvent(self, event):
        self.camera.release()  # 释放摄像头资源
        self.timer.stop()  # 停止定时器

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