Java 8 opencv 简单示例 UnsatisfiedLinkError

Question

我想学习opencv，所以我想运行这个代码示例。

我已经从opencv 3.4.2下载了软件包，严格添加到intellij，java版本8中。版本3.20 mi可以正常工作，但需要更高版本的3.4.2或更高版本。请帮忙，我无能为力。这是我的代码:

public class Main {

    public static void main(String[] args) {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        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());
    }
}

Exception in thread "main" java.lang.UnsatisfiedLinkError: C:\Work\opencv\opencv\build\java\x64\opencv_java342.dll: Can't find dependent libraries
    at java.base/java.lang.ClassLoader$NativeLibrary.load0(Native Method)
    at java.base/java.lang.ClassLoader$NativeLibrary.load(ClassLoader.java:2430)
    at java.base/java.lang.ClassLoader$NativeLibrary.loadLibrary(ClassLoader.java:2487)
    at java.base/java.lang.ClassLoader.loadLibrary0(ClassLoader.java:2684)
    at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2649)
    at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:829)
    at java.base/java.lang.System.loadLibrary(System.java:1867)
    at Main.main(Main.java:9)

Answer 1

您需要使用以下方式加载.dll或.so库:

System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

或者

System.load(PATH_TO_NATIVE_LIB);

接下来需要添加对 pom.xml 的依赖:

<dependency>
    <groupId>org.openpnp</groupId>
    <artifactId>opencv</artifactId>
    <version>3.4.2-1</version>
</dependency>

库和依赖项版本必须相同。