1、javacv 1.5.10版本
package com.example.demo.ffpemg;import lombok.SneakyThrows;
import org.bytedeco.javacv.CanvasFrame;
import org.bytedeco.opencv.opencv_core.Mat;import javax.swing.*;
import java.awt.image.BufferedImage;import static org.bytedeco.opencv.global.opencv_core.BORDER_DEFAULT;
import static org.bytedeco.opencv.global.opencv_imgcodecs.imread;
import static org.bytedeco.opencv.global.opencv_imgproc.Laplacian;public class OpenCVTest1 {@SneakyThrowspublic static void main(String[] args) {// 读取图片final Mat src = imread("data/boldt.jpg");display(src, "Input");// 拉普拉斯滤波器（Laplacian Filter）是图像处理中的一种常见操作，它用于检测图像中的边缘。
// 拉普拉斯滤波器是一种二阶导数滤波器，能够突出图像中的快速变化部分，如边缘和纹理// 应用拉普拉斯滤波器// 注意：这里的参数可以根据需要进行调整// 第三个参数表示滤波器的深度，通常使用与源图像相同的深度// 第四个参数表示滤波器的大小，必须是正奇数// 第五个参数表示scale因子，用于控制结果的缩放// 第六个参数表示delta值，该值会被加到最终的像素值上final Mat dest = new Mat();Laplacian(src, dest, src.depth(), 1, 3, 0, BORDER_DEFAULT);display(dest, "Laplacian");}public static void display(Mat image, String caption) {// Create image window named "My Image".final CanvasFrame canvas = new CanvasFrame(caption, 1.0);// Request closing of the application when the image window is closed.canvas.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);// Convert from OpenCV Mat to Java Buffered image for displayfinal BufferedImage bi = OpenCVUtilsJava.toBufferedImage(image);// Show image on window.canvas.showImage(bi);}}
OpenCVUtilsJava.java
package com.example.demo.ffpemg;
import org.bytedeco.javacv.*;
import org.bytedeco.opencv.opencv_core.Mat;import javax.swing.*;
import java.awt.image.BufferedImage;
import java.io.File;import static org.bytedeco.opencv.global.opencv_imgcodecs.*;/*** Helper methods that simplify use of OpenCV API.*/
public class OpenCVUtilsJava {/*** Load an image and show in a CanvasFrame. If image cannot be loaded the application will exit with code 1.** @return loaded image*/public Mat loadAndShowOrExit(File file) {return loadAndShowOrExit(file, IMREAD_COLOR);}/*** Load an image and show in a CanvasFrame. If image cannot be loaded the application will exit with code 1.** @param flags Flags specifying the color type of a loaded image:* <ul>* <li> `>0` Return a 3-channel color image</li>* <li> `=0` Return a gray scale image</li>* <li> `<0` Return the loaded image as is. Note that in the current implementation* the alpha channel, if any, is stripped from the output image. For example, a 4-channel* RGBA image is loaded as RGB if the `flags` is greater than 0.</li>* </ul>* Default is gray scale.* @return loaded image*/public static Mat loadAndShowOrExit(File file, Integer flags) {Mat image = loadOrExit(file, flags);show(image, file.getName());return image;}/*** Load an image. If image cannot be loaded the application will exit with code 1.** @return loaded image*/public static Mat loadOrExit(File file) {return loadOrExit(file, IMREAD_COLOR);}/*** Load an image. If image cannot be loaded the application will exit with code 1.** @param flags Flags specifying the color type of a loaded image:* <ul>* <li> `>0` Return a 3-channel color image</li>* <li> `=0` Return a gray scale image</li>* <li> `<0` Return the loaded image as is. Note that in the current implementation* the alpha channel, if any, is stripped from the output image. For example, a 4-channel* RGBA image is loaded as RGB if the `flags` is greater than 0.</li>* </ul>* Default is gray scale.* @return loaded image*/public static Mat loadOrExit(File file, Integer flags) {Mat image = imread(file.getAbsolutePath(), flags);if (image.empty()) {System.out.println("Couldn't load image: " + file.getAbsolutePath());System.exit(1);}return image;}/*** Show image in a window. Closing the window will exit the application.*/public static void show(Mat mat, String title) {BufferedImage image = toBufferedImage(mat);show(image, title);}/*** Show image in a window. Closing the window will exit the application.*/public static void show(BufferedImage image, String title) {CanvasFrame canvas = new CanvasFrame(title, 1);canvas.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);canvas.showImage(image);}public static BufferedImage toBufferedImage(Mat mat) {// Make sure that FrameConverters and JavaCV Frame are properly closedtry (OpenCVFrameConverter.ToMat converter = new OpenCVFrameConverter.ToMat()) {try (Frame frame = converter.convert(mat)) {try (Java2DFrameConverter java2DConverter = new Java2DFrameConverter()) {return java2DConverter.convert(frame);}}}}/*** Save the image to the specified file.* <p>* The image format is chosen based on the filename extension (see `imread()` in OpenCV documentation for the list of extensions).* Only 8-bit (or 16-bit in case of PNG, JPEG 2000, and TIFF) single-channel or* 3-channel (with ‘BGR’ channel order) images can be saved using this function.* If the format, depth or channel order is different, use Mat::convertTo() , and cvtColor() to convert it before saving.** @param file file to save to. File name extension decides output image format.* @param image image to save.*/public void save(File file, Mat image) {imwrite(file.getAbsolutePath(), image);}/*** Convert a Mat to ScalaFX Image*/public static javafx.scene.image.Image toFXImage(Mat mat) {try(OpenCVFrameConverter.ToMat openCVConverter = new OpenCVFrameConverter.ToMat()) {try(Frame frame = openCVConverter.convert(mat)){try(JavaFXFrameConverter javaFXConverter = new JavaFXFrameConverter()) {return javaFXConverter.convert(frame);}}}}
}
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