在C++显示图片，OpenCV为其提供了一个叫做HighGUI的接口，尚且没有在java中实现。OpenCV支持有限的图片格式，具体可参阅官方文档（常用的支持bmp、jpeg、png、tiff），可以使用Imgcodecs类的imread方法来读取图片（注意测试时，路径不要包括中文）：

结构目录（Eclipse中）：

创建两个类：OpenCVTest 和 ImageViewer

步骤

import org.opencv.core.*;import org.opencv.imgcodecs.Imgcodecs;import org.opencv.imgproc.Imgproc;public class OpenCVTest {public static void main(String[] args) {// 载入dll（必须先加载）System.loadLibrary(Core.NATIVE_LIBRARY_NAME);//将文件读入为OpenCV的Mat格式。注意测试时，路径不要包括中文Mat src = Imgcodecs.imread("E:/Pictures/test.jpg");if(src.dataAddr()==0){System.out.println("打开文件出错");}ImageViewer imageViewer = new ImageViewer(src, "第一幅图片");imageViewer.imshow();}}

创建类 ImageViewer

import org.opencv.core.Mat;import javax.swing.*;import java.awt.*;import java.awt.image.BufferedImage;import java.awt.image.DataBufferByte;public class ImageViewer {private JLabel imageView;private Mat image;private String windowName;/*** 如果使用junit测试时调用该方法，图像会一闪而过，可通过sleep()等方式暂时显示* @param*/public ImageViewer(Mat image) {this.image = image;}/*** @param image要显示的mat* @param windowName 窗口标题*/public ImageViewer(Mat image, String windowName) {this.image = image;this.windowName = windowName;}/*** 图片显示*/public void imshow() {setSystemLookAndFeel();Image loadedImage = toBufferedImage(image);JFrame frame = createJFrame(windowName, image.width(), image.height());imageView.setIcon(new ImageIcon(loadedImage));frame.pack();frame.setLocationRelativeTo(null);frame.setVisible(true);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 用户点击窗口关闭}private void setSystemLookAndFeel() {try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());} catch (ClassNotFoundException e) {e.printStackTrace();} catch (InstantiationException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (UnsupportedLookAndFeelException e) {e.printStackTrace();}}private JFrame createJFrame(String windowName, int width, int height) {JFrame frame = new JFrame(windowName);imageView = new JLabel();final JScrollPane imageScrollPane = new JScrollPane(imageView);imageScrollPane.setPreferredSize(new Dimension(width, height));frame.add(imageScrollPane, BorderLayout.CENTER);frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);return frame;}private Image toBufferedImage(Mat matrix) {int type = BufferedImage.TYPE_BYTE_GRAY;if (matrix.channels() > 1) {type = BufferedImage.TYPE_3BYTE_BGR;}int bufferSize = matrix.channels() * matrix.cols() * matrix.rows();byte[] buffer = new byte[bufferSize];matrix.get(0, 0, buffer); // 获取所有的像素点BufferedImage image = new BufferedImage(matrix.cols(), matrix.rows(), type);final byte[] targetPixels = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();System.arraycopy(buffer, 0, targetPixels, 0, buffer.length);return image;}}

参考博客

/zmx729618/article/details/78113783/qq_36224522/article/details/81390110/byna11sina11/article/details/79044738

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