cv_qt.py

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

class VideoWidget(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.label = QLabel(self)
        layout = QVBoxLayout()
        layout.addWidget(self.label)
        self.setLayout(layout)
        self.cap = cv2.VideoCapture(0)  # Open the default camera
        self.timer = QTimer(self)
        self.timer.timeout.connect(self.update_frame)
        self.timer.start(1000 // 30)  # 30 FPS

    def update_frame(self):
        ret, frame = self.cap.read()
        if ret:
            frame_rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
            h, w, ch = frame_rgb.shape
            bytes_per_line = ch * w
            q_img = QImage(frame_rgb.data, w, h, bytes_per_line, QImage.Format_RGB888)
            pixmap = QPixmap.fromImage(q_img)
            self.label.setPixmap(pixmap)

    def closeEvent(self, event):
        self.cap.release()
        event.accept()

class MainWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.video_widget = VideoWidget()
        layout = QVBoxLayout()
        layout.addWidget(self.video_widget)
        self.setLayout(layout)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    main_window = MainWindow()
    main_window.setWindowTitle('OpenCV and Qt Integration')
    main_window.setGeometry(100, 100, 640, 480)
    main_window.show()
    sys.exit(app.exec_())