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现象：树莓派/NanoPi 在xrdp（远程连接）下打开opencv程序时出现Xlib: extension “RANDR” missing on displaywindow system doesn't support opengl解决：sudo apt-get install vnc4server原因：xrdp默认使用的是tightvncsever，

用opencv的imshow显示图片窗口，然而没有标题栏，而且固定在左上角，所有窗口重合了，也没法挪动。如下图：解决方法：在imshow之前：namedWindow("name", CV_WINDOW_NORMAL);原因：窗口被设置成CV_WINDOW_AUTOSIZE了结果：

好不容易安装完OpenPose，运行一下demo，发现出现以下问题：Starting pose estimation demo.Unable to stop the stream: Inappropriate ioctl for deviceterminate called after throwing an instance of 'std::runtime_error'wh