标签：sudo mes 文件 控制 ret opencv3.4 opencv3 find 图片
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()
#单个包添加
#add_executable( DisplayImage src/DisplayImage.cpp )
#文件路径自动读取添加
AUX_SOURCE_DIRECTORY(./src DIR_SRCS)
ADD_EXECUTABLE(DisplayImage ${DIR_SRCS})
target_link_libraries( DisplayImage ${OpenCV_LIBS} )
#设置可执行文件的输出目录
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));//控制视频流的帧率，10ms一帧
if (key == 27) //按esc退出
break;
}
return 0;
}
报错问题
https://blog.csdn.net/dhaduce/article/details/80379792
笔者在进行测试时，出现如下错误：
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默认采用0号摄像头，TX2的0号摄像头是板子上自带的板上摄像头，而我们的usb摄像头是1号，故笔者使用如下代码，解决了问题
如果上述方法不能解决问题，可以尝试如下操作：
首先检查是否安装了v4l1compat.so
dpkg -S v4l1compat.so
若没有安装，则安装；若找到该文件，则跳过安装，进行下一步
apt-cache search libv4l sudo apt-get install libv4l-ruby1.8
然后添加环境变量
export LD_PRELOAD=/usr/lib/aarch64-linux-gnueabihf/libv4l/v4l1compat.so export LD_PRELOAD=/usr/lib/aarch64-linux-gnueabihf/libv4l/v4l2convert.so
sudo ldconfig
标签：sudo mes 文件 控制 ret opencv3.4 opencv3 find 图片
原文地址：https://www.cnblogs.com/kekeoutlook/p/10604226.html
