RK3588在SSH上启动OpenCV报错：Can‘t initialize GTK backend in function ‘cvInitSystem‘-Toy模板网

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2023-04-21记录，来自我的博文RK3588在SSH上启动OpenCV报错：Can‘t initialize GTK backend in function ‘cvInitSystem‘

1、问题

环境：ubunt20.04、RK3588、OpenCV3.4.16
SSH终端：Win10

在SSH终端上，编译运行RK3588上的OpenCV3.4.16自带的C++示例代码：topeet@iTOP-RK3588:~/Downloads/opencv-3.4.16/samples/cpp/example_cmake/build $ sudo ./opencv_example，无法打开摄像头，报错，返回的信息如下：

topeet@iTOP-RK3588:~/Downloads/opencv-3.4.16/samples/cpp/example_cmake/build $ sudo ./opencv_example
Built with OpenCV 3.4.16
[ WARN:0] OpenCV | GStreamer warning: Cannot query video position: status=0, value=-1, duration=-1
Capture is opened
MoTTY X11 proxy: Authorisation not recognised

In case you are trying to start a graphical application with "sudo", read this article in order to avoid this issue:
https://blog.mobatek.net/post/how-to-keep-X11-display-after-su-or-sudo/

Unable to init server: Could not connect: Connection refused
terminate called after throwing an instance of 'cv::Exception'
  what():  OpenCV(3.4.16) /home/topeet/Downloads/opencv-3.4.16/modules/highgui/src/window_gtk.cpp:624: error: (-2:Unspecified error) Can't initialize GTK backend in function 'cvInitSystem'

Aborted

RK3588在SSH上启动OpenCV报错：Can‘t initialize GTK backend in function ‘cvInitSystem‘,RK3588,opencv,ssh,python
但是能够正确运行Python的代码：

import cv2
import time

def main():
    # 使用GStreamer管道从MIPI摄像头捕获视频，添加视频帧率
    gst_pipeline = 'v4l2src device=/dev/video11 ! video/x-raw,format=NV12,width=640,height=480,framerate=30/1 ! appsink'
    # 从GStreamer管道创建OpenCV VideoCapture对象
    cap = cv2.VideoCapture(gst_pipeline, cv2.CAP_GSTREAMER)

    if not cap.isOpened():
        # 如果无法打开摄像头，则输出提示信息
        print("无法打开摄像头")
        return
    time0 = time.time() # 获取开始时间
    while True:
        # 从摄像头捕获帧
        ret, frame = cap.read()
        frame = cv2.cvtColor(frame, cv2.COLOR_YUV2BGR_NV12)
        # 如果捕获到帧，则显示它
        if ret:
            time1 = time.time() # 获取结束时间
            fps = 1 / (time1 - time0) # 计算实时帧率
            time0 = time1 # 更新开始时间
            cv2.putText(frame, "FPS: {:.2f}".format(fps), (10, 30), cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 0, 255), 2) # 在图像上显示帧率
            cv2.imshow("MIPI Camera", frame)
        # 按下'q'键退出循环
        if cv2.waitKey(1) & 0xFF == ord("q"):
            break

    # 释放资源并关闭窗口
    cap.release()
    cv2.destroyAllWindows()

if __name__ == "__main__":
    main()

RK3588在SSH上启动OpenCV报错：Can‘t initialize GTK backend in function ‘cvInitSystem‘,RK3588,opencv,ssh,python

2、参考资料

1、error: (-2:Unspecified error) Can’t initialize GTK backend in function ‘cvInitSystem’
2、在树莓派上使用OPENCV的问题
3、Pi-opencv文章来源地址https://www.toymoban.com/news/detail-587348.html

3、解决

解决方式：
用串口或者是直接在RK3588上输入命令运行程序，在SSH连接的时候，没法正确使用，会报错。在串口上直接运行，结果如下：

能够打开了，没有报错了！

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