Mac M1编译OpenCV获取libopencv_java490.dylib文件

Window OpenCV下载地址

https://opencv.org/releases/

OpenCV源码下载

https://github.com/opencv/opencv/tree/4.9.0
https://github.com/opencv/opencv_contrib/tree/4.9.0

OpenCV依赖

brew install libjpeg libpng libtiff cmake3 ant freetype

构建open CV

cmake -G Ninja \-DCMAKE_BUILD_TYPE=Release \-DCMAKE_OSX_ARCHITECTURES="arm64;x86_64" \-DWITH_IPP=OFF \-DWITH_TBB=OFF \-DWITH_OPENCL=OFF \-DENABLE_NEON=OFF \-DCPU_BASELINE="" \-DCPU_DISPATCH="" \-DBUILD_opencv_dnn=OFF \-DBUILD_JAVA=ON \-DPNG_ARM_NEON_OPT=0 \-DBUILD_opencv_imgcodecs=ON \-DBUILD_opencv_ml=OFF \-DBUILD_LIST="core;java" \-DCV_DISABLE_OPTIMIZATION=ON \-DBUILD_opencv_python=OFF \-DOPENCV_EXTRA_MODULES_PATH=/Users/youshang/Downloads/opencv_contrib-4.9.0/modules \-DJAVA_AWT_INCLUDE_PATH=$JAVA_HOME/include \-DJAVA_AWT_LIB=$JAVA_HOME/lib/libjawt.dylib \-DJAVA_INCLUDE_PATH=$JAVA_HOME/include \-DJAVA_INCLUDE_PATH2=$JAVA_HOME/include/darwin \-DJAVA_JVM_LIBRARY=$JAVA_HOME/lib/server/libjvm.dylib \..

• 注意-DCMAKE_OSX_ARCHITECTURES、-DBUILD_LIST参数,仅仅是为了编译成功，里面缺了很多模块
• 编译出来只能使用本地库，jar功能不全选择maven仓库下载替换

构建完成标志：

编译opencv

ninja

编译完成标志：

• 编译opencv为了获取 libopencv_java490文件
• 文件存放路径为：opencv-4.9.0/build/lib (不要使用构建成功的jar包，jar包单独下载)
• libopencv_java490.dylib Mac依赖的 OpenCV本地库
• opencv_java490.dll window依赖的OpenCV本地库

项目中集成OpenCV

配置libopencv_java490文件

• 将libopencv_java490文件丢到 /usr/local/lib 目录下，在项目中加载OpenCV本地库

    static {// 加载 OpenCV 本地库System.loadLibrary(Core.NATIVE_LIBRARY_NAME);}

• idea添加VM options引用

  -Djava.library.path=/usr/local/lib
  

  

配置openCV jar包

        <dependency><groupId>com</groupId><artifactId>opencv</artifactId><version>4.9.0</version><scope>system</scope><systemPath>${project.basedir}/libs/opencv-4.9.0-0.jar</systemPath></dependency>

异常信息：

no opencv_java490

Exception in thread "main" java.lang.UnsatisfiedLinkError: no opencv_java490 in java.library.path: [/Users/youshang/Library/Java/Extensions, /Library/Java/Extensions, /Network/Library/Java/Extensions, /System/Library/Java/Extensions, /usr/lib/java, .]at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2678)at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:830)at java.base/java.lang.System.loadLibrary(System.java:1890)at com.rangertech.osc.video.utils.CameraCalibrationJava.<clinit>(CameraCalibrationJava.java:26)

• 原因：未配置libopencv_java490所导致的
• 解决方法：将libopencv_java490配置到-Djava.library.path= 读取的位置即可

long org.opencv.imgcodecs.Imgcodecs.imread_1(java.lang.String)

Exception in thread "main" java.lang.UnsatisfiedLinkError: 'long org.opencv.imgcodecs.Imgcodecs.imread_1(java.lang.String)'at org.opencv.imgcodecs.Imgcodecs.imread_1(Native Method)at org.opencv.imgcodecs.Imgcodecs.imread(Imgcodecs.java:330)at com.rangertech.osc.video.utils.CameraCalibrationJava.calibration(CameraCalibrationJava.java:83)at com.rangertech.osc.video.utils.CameraCalibrationJava.main(CameraCalibrationJava.java:192)

• 原因：有可能是jdk架构、libopencv_java490版本、libopencv_java490编译架构，不一致导致的

• 解决方法：单独下载opencv jar包

  • 下载地址：https://repo1.maven.org/maven2/org/openpnp/opencv/4.9.0-0/

  • 在调用时主动加载OpenCV：

        public static void main(String[] args) {//加载openCVPrintVersion.main(args);CameraCalibrationDTO dto = new CameraCalibrationDTO();dto.setChessboardHeight(6);dto.setChessboardWidth(9);dto.setSquareSize(24.0);dto.setImagePaths(Lists.newArrayList("/Users/youshang/Downloads/Checkerboard.png"));CameraCalibrationJava.calibration(dto);}
    

zsh: command not found:

CMake Error: The source directory "/Users/youshang/Downloads/opencv-4.9.0/build/ " does not exist.
Specify --help for usage, or press the help button on the CMake GUI.
zsh: command not found: -DBUILD_JAVA=ON

• 原因：
  • CMake 提示找不到 …/opencv-4.9.0/build/ 目录，原因是路径末尾多了一个空格；
  • 终端报 “zsh: command not found: -DBUILD_JAVA=ON” 往往是因为换行符 \ 后面不小心留了空格，导致 shell 没把它当作续行符处理，接下来的参数被当成了新的命令。