opencv for java 灰度测试代码

package org.example.opencv; import lombok.extern.slf4j.Slf4j; import org.junit.jupiter.api.Test; import org.junit.runner.RunWith; import org.opencv.core.CvType; import org.opencv.core.Mat; 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; @Slf4j @RunWith(SpringRunner.class) public class DemoGrayscaleTests { @Test public void testOpencv() throws Exception { // 解决awt报错问题 System.setProperty("java.awt.headless", "false"); log.info("java library path: {}", System.getProperty("java.library.path")); // 加载动态库 URL url = ClassLoader.getSystemResource("lib/opencv/libopencv_java460.dylib"); log.info("url path: {}", url.getPath()); System.load(url.getPath()); // 读取图像 Mat image = imread("/Users/xiaomifeng/Pictures/face.jpeg"); 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("/Users/xiaomifeng/Pictures/hello.jpg", grayImage); waitKey(); } }