【R329开发板评测】R329 MaixSense OpenCV图像采集

先搭建个可以彩图的环境

1、交叉编译OpenCV

到opencv官网下载opencv-3.4.15并解压
工具链使用gcc-arm-9.2-2019.12-x86\_64-aarch64-none-linux-gnu

cd opencv-3.4.15
mkdir build-r329 && cd build-r329
cmake \
-DCMAKE_TOOLCHAIN_FILE=../platforms/linux/aarch64-gnu.toolchain.cmake \
-DBUILD_SHARED_LIBS=OFF \
..
make -j
make install

2、测试

搭建cmake工程，结构如下：

mod@archlinux videoCapture $ tree -L 2
.
├── build
├── CMakeLists.txt
├── main.cpp
└── toolchains
    └── aarch64-linux-gnu.toolchain.cmake

CMakeLists.txt

cmake_minimum_required(VERSION 3.10.2)
project(videoCap)

set(OpenCV_DIR /home/mod/code/opencv/opencv-3.4.15/build-r329/install/share/OpenCV)
find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})

macro(add_example name)
   add_executable(${name} ${name}.cpp)
    target_link_libraries(${name} ${OpenCV_LIBS}) 
endmacro()

add_example(main)

main.cpp

#include "opencv2/opencv.hpp"
#include <iostream>


int main(void){
    cv::Mat frame;
    cv::VideoCapture cap;
    cap.open("/dev/video0");

    if (!cap.isOpened())
    {
        fprintf(stderr, "Failed to open");
        return -1;
    }
    
//     for(;;){
//         
//         cap >> frame;
//         imshow("scr", frame);
//         if(cv::waitKey(30) == 'q'){
//             break;
//         }
//     }
    cap >> frame;
    cv::imwrite("test.bmp", frame);
    
    return 0;
}

aarch64-linux-gnu.toolchain.cmake

set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR aarch64)

set(CMAKE_C_COMPILER "aarch64-linux-gnu-gcc")
set(CMAKE_CXX_COMPILER "aarch64-linux-gnu-g++")

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

set(CMAKE_C_FLAGS "-march=armv8-a")
set(CMAKE_CXX_FLAGS "-march=armv8-a")

# cache flags
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" CACHE STRING "c++ flags")

编译

cmake -DCMAKE_TOOLCHAIN_FILE=../toolchains/aarch64-linux-gnu.toolchain.cmake ..
make

拷贝到开发板上(如果需要可以配置nfs环境，参考我在D1上的文章)：

scp main root@192.168.100.93:/root

要密码的话，直接在开发板上设计就行。
在开发板上运行程序：

cd root
./main

可以看到多了一副图像test.bmp,拷贝到本地：

scp root@192.168.100.93:/root/test.bmp ./

如下：

编译好的opencv如下：
链接: https://pan.baidu.com/s/1A8UK... 密码: vm3s
接下来就可以做一些好玩的了