使用 OpenCV 捕获图像 - 选择超时错误 [英] Image Capture with OpenCV - Select Timeout Error

问题描述

我想保存从我的网络摄像头附加的 BeagleBone Black 捕获的图像，但是当我运行以下代码时，我收到错误:选择超时.

I would like to save a captured image from my webcam attached BeagleBone Black, however when I run the following code, I get the error: select timeout.

#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include "opencv2/opencv.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/videoio.hpp"

using namespace std;
using namespace cv;

int main(){



        cout<< "Hello, OpenCV version: "<< CV_VERSION << endl;


        Mat frame;
        VideoCapture cap(0);


        cap.set(CV_CAP_PROP_FRAME_WIDTH , 320);
        cap.set(CV_CAP_PROP_FRAME_HEIGHT , 240);

        cap >> frame;

        imwrite("camCap.jpg", frame);

        return 0;
}

当我编译和运行代码时:

When I compile and run the code:

root@beaglebone:/home/iroh/test# g++ test.cpp -lopencv_core -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -o test
root@beaglebone:/home/iroh/test# ./test
Hello, OpenCV version: 3.1.0
select timeout
OpenCV Error: Assertion failed (total() == 0 || data != NULL) in Mat, file /home/iroh/Downloads/opencv-3.1.0/modules/core/include/opencv2/core/mat.inl.hpp, line 410
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/iroh/Downloads/opencv-3.1.0/modules/core/include/opencv2/core/mat.inl.hpp:410: error: (-215) total() == 0 || data != NULL in function Mat

Aborted

导致该问题的原因可能是什么?

What can be the cause of that problem?

根据错误输出，我的框架是空的.这是我第一次将这个网络摄像头连接到 BeagleBone Black.它可以在我的 PC 上正常运行，但我不知道它是否可以与 BeagleBone Black 一起成功运行.

According to the error output, my frame is empty. It is first time I attached this webcam to BeagleBone Black. It works properly on my PC, but I do not know whether it is working successfully with BeagleBone Black.

这里是 dmesg 输出:

Here is the dmesg output:

[ 4276.642456] usb 1-1: new high-speed USB device number 2 using musb-hdrc
[ 4277.411212] usb 1-1: New USB device found, idVendor=1e4e, idProduct=0110
[ 4277.411257] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 4277.411284] usb 1-1: Product: USB2.0 Camera
[ 4277.411310] usb 1-1: Manufacturer: Etron Technology, Inc.
[ 4277.532768] uvcvideo: Found UVC 1.00 device USB2.0 Camera (1e4e:0110)
[ 4277.542871] input: USB2.0 Camera as /devices/platform/ocp/47400000.usb/47401c00.usb/musb-hdrc.1.auto/usb1/1-1/1-1:1.0/input/input1
[ 4277.547293] usbcore: registered new interface driver uvcvideo
[ 4277.547322] USB Video Class driver (1.1.1)

我该怎么办?

谢谢！

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