Jetson TX2（3）opencv3 打開usb攝像頭

 

ubuntu2604

opencv3.4.0

 

https://blog.csdn.net/ultimate1212/article/details/80936175?utm_source=blogxgwz7

 

 

 

cmake_minimum_required(VERSION 2.8)
project(DisplayImage)  

set( CMAKE_CXX_FLAGS "-std=c++11 -O3" )

find_package( OpenCV REQUIRED )  
#if(CMAKE_VERSION VERSION_LESS "2.8.11")
  # Add OpenCV headers location to your include paths
  include_directories(
  include
  ${OpenCV_INCLUDE_DIRS}
   )
#endif()

#單個包添加
#add_executable( DisplayImage src/DisplayImage.cpp )  

#文件路徑自動讀取添加
AUX_SOURCE_DIRECTORY(./src DIR_SRCS)
ADD_EXECUTABLE(DisplayImage ${DIR_SRCS})
target_link_libraries( DisplayImage ${OpenCV_LIBS} )



#設置可執行文件的輸出目錄
SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)     

　　

 

#include <iostream>
#include <opencv2/opencv.hpp>
#include <string>
using namespace cv;
using namespace std;
int main()
{
    VideoCapture capture(0);
    if(capture.isOpened())
    {
        cout<<"success"<<endl;
    }
    Mat frame;
    while (capture.isOpened())
    {
        capture >> frame;
        imshow("capture", frame);
        char key = static_cast<char>(cvWaitKey(10));//控制視頻流的幀率，10ms一幀
        if (key == 27)  //按esc退出
            break;               
    }
    return 0;
}

　　報錯問題

https://blog.csdn.net/dhaduce/article/details/80379792

 

筆者在進行測試時，出現如下錯誤：

libv4l2: error setting pixformat: Invalid argument
libv4l2: error setting pixformat: Invalid argument
libv4l2: error setting pixformat: Invalid argument
libv4l2: error setting pixformat: Invalid argument
VIDEOIO ERROR: V4L2: Pixel format of incoming image is unsupported by OpenCV
Couldn't connect to webcam.

OPENCV默認采用0號攝像頭，TX2的0號攝像頭是板子上自帶的板上攝像頭，而我們的usb攝像頭是1號，故筆者使用如下代碼，解決了問題

如果上述方法不能解決問題，可以嘗試如下操作：

首先檢查是否安裝了v4l1compat.so

dpkg -S v4l1compat.so

　　若沒有安裝，則安裝；若找到該文件，則跳過安裝，進行下一步

apt-cache search libv4l
sudo apt-get install libv4l-ruby1.8

　　然后添加環境變量

export LD_PRELOAD=/usr/lib/aarch64-linux-gnueabihf/libv4l/v4l1compat.so
export LD_PRELOAD=/usr/lib/aarch64-linux-gnueabihf/libv4l/v4l2convert.so

　　

sudo ldconfig