如何在opencv python中放置驻留时间

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

class DwellTimeWidget(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
        self.dwell_time = 0
        self.start_time = None

    def initUI(self):
        self.label = QLabel(self)
        self.label.setGeometry(10, 10, 640, 480)
        self.setMouseTracking(True)
        self.show()

    def mouseMoveEvent(self, event):
        if self.start_time is None:
            self.start_time = event.pos()
        else:
            current_pos = event.pos()
            if self.is_inside_area(current_pos):
                self.dwell_time += 1
            else:
                self.start_time = None
                self.dwell_time = 0

    def is_inside_area(self, pos):
        # 定义感兴趣的区域，例如左上角的100x100像素区域
        x, y = pos.x(), pos.y()
        return 0 <= x < 100 and 0 <= y < 100

    def paintEvent(self, event):
        super().paintEvent(event)
        # 在这里绘制图像或其他UI元素
        # 示例：显示驻留时间
        self.label.setText(f"Dwell Time: {self.dwell_time} ms")

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