Java中使用opencv的问题

<dependency>
            <groupId>org</groupId>
            <artifactId>opencv</artifactId>
            <scope>system</scope>
            <systemPath>${project.basedir}\src\main\resources\lib\opencv\opencv-440.jar</systemPath>
</dependency>

// 加载动态库
URL url = ClassLoader.getSystemResource("lib/opencv/opencv_java440.dll");
System.load(url.getPath());

package testopencv.demo;
 
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
 
import java.net.URL;
 
import static org.opencv.highgui.HighGui.imshow;
import static org.opencv.highgui.HighGui.waitKey;
import static org.opencv.imgcodecs.Imgcodecs.imread;
import static org.opencv.imgcodecs.Imgcodecs.imwrite;
import static org.opencv.imgproc.Imgproc.COLOR_RGB2GRAY;
import static org.opencv.imgproc.Imgproc.cvtColor;
 
@RunWith(SpringRunner.class)
@SpringBootTest
class DemoApplicationTests {
    /**
     * @return
     * @Description
     * @Param
     * @Author zhangsan
     * @Date 2020.09.05 9:43
     **/
    @Test
    public void testOpencv() throws Exception {
        // 解决awt报错问题
        System.setProperty("java.awt.headless", "false");
        System.out.println(System.getProperty("java.library.path"));
        // 加载动态库
        URL url = ClassLoader.getSystemResource("lib/opencv/opencv_java440.dll");
        System.load(url.getPath());
        // 读取图像
        Mat image = imread("C:\\Users\\admin\\Pictures\\hello.jpg");
        if (image.empty()) {
            throw new Exception("image is empty");
        }
        imshow("Original Image", image);
 
        // 创建输出单通道图像
        Mat grayImage = new Mat(image.rows(), image.cols(), CvType.CV_8SC1);
        // 进行图像色彩空间转换
        cvtColor(image, grayImage, COLOR_RGB2GRAY);
 
        imshow("Processed Image", grayImage);
        imwrite("D://hello.jpg", grayImage);
        waitKey();
    }
}