可以看到下面这句报错信息：
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/dapeng/anaconda3/envs/ppocr/lib/python3.9/site-packages/cv2/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: xcb, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl.
也就是cv2有问题，解决办法如下：
pip3 uninstall opencv-python
pip3 install opencv-contrib-python-headless==4.5.1.48