mac m1上java调用opencv

• mac1
• openjdk17
  官网上没有编译好的mac m1上二进制库.需要自己下载源代码编译.

1. https://opencv.org/releases/从这里下载源代码.如opencv-4.7.0.zip解压
2. 把 opencv-4.7.0文件夹重命名为opencv
3. 在opencv同级目录下建一个文件夹build_opencv
4. cd到build_opencv,然后执行

   cmake -DBUILD_SHARED_LIBS=OFF ../opencv
   
   

   注意确认OpenCV modules里面有java
5. 执行

   make -j8
   

   会在build_opencv里编出来Opencv的jar包和链接库.
   新建一个文件SimpleSample.java内容为

   import org.opencv.core.Core;
   import org.opencv.core.Mat;
   import org.opencv.core.CvType;
   import org.opencv.core.Scalar;
   public class SimpleSample {
     static{ System.loadLibrary(Core.NATIVE_LIBRARY_NAME); }
     public static void main(String[] args) {
       System.out.println("Welcome to OpenCV " + Core.VERSION);
       Mat m = new Mat(5, 10, CvType.CV_8UC1, new Scalar(0));
       System.out.println("OpenCV Mat: " + m);
       Mat mr1 = m.row(1);
       mr1.setTo(new Scalar(1));
       Mat mc5 = m.col(5);
       mc5.setTo(new Scalar(5));
       System.out.println("OpenCV Mat data:\n" + m.dump());
     }
   }
   
   

6. 执行

   javac -cp /Users/zhouyang/Documents/code/cpp/build_opencv/java_test/bin/opencv-470.jar SimpleSample.java
   java -Djava.library.path=/Users/zhouyang/Documents/code/cpp/build_opencv/lib -cp /Users/zhouyang/Documents/code/cpp/build_opencv/java_test/bin/opencv-470.jar:./ SimpleSample
   

参考资料

opencv java官方文档