Java (JDK 21) 调用 OpenCV (4.8.0)

灰太狼 2024-02-05 12:51 13阅读 0赞

#### Java 调用 OpenCV ####

*  一.OpenCV 下载和安装
 *  二.创建 Java Maven 项目
 *  三.其他测试

## 一.OpenCV 下载和安装 ##

[Open CV 官网][Open CV]

可以下载编译好的包，也可以下载源码自行编译

![在这里插入图片描述][dc94f697601c4e608e561cb92da312f4.png]

双击安装 opencv-4.8.0-windows.exe 默认为当前目录

![在这里插入图片描述][18c52126b7a34683b05f8d0ec65ccb64.png]

安装即解压缩

![在这里插入图片描述][2cec5e4a65174d9392c71236ac2ece44.png]

根据系统位数选择

![在这里插入图片描述][fb3593728dc54e8f86e5a0d4e225da40.png]

将 x64 目录下 opencv\_java480.dll 放到 JDK 目录

![在这里插入图片描述][43426bf3a64c4be29a1ea779ac4ed3d6.png]

将 opencv-480.jar 引入项目依赖

## 二.创建 Java Maven 项目 ##

工程截图

![在这里插入图片描述][d8ddc83b79e3481f92e8b0050d47504f.png]

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>org.example</groupId>
        <artifactId>opencv</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <properties>
            <maven.compiler.source>20</maven.compiler.source>
            <maven.compiler.target>20</maven.compiler.target>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.opencv</groupId>
                <artifactId>opencv</artifactId>
                <version>4.8.0</version>
                <scope>system</scope>
                <systemPath>${project.basedir}/src/main/resources/lib/opencv-480.jar</systemPath>
            </dependency>
        </dependencies>
    
    </project>

测试代码

package org.example;
    
    import org.opencv.core.Core;
    import org.opencv.core.Mat;
    import org.opencv.core.Size;
    import org.opencv.highgui.HighGui;
    import org.opencv.imgcodecs.Imgcodecs;
    import org.opencv.imgproc.Imgproc;
    
    /**
     * @author Administrator
     */
    public class Main {
        
    
        /**
         * load opencv_java480
         */
        static {
        
            System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        }
    
        public static void main(String[] args) {
        
    
            String img = "C:\\Users\\Administrator\\Desktop\\IMG_20140207_165557.jpg";
            //read image
            Mat src = Imgcodecs.imread(img);
            //define a dst mat
            Mat dst = new Mat();
            // resize
            Imgproc.resize(src,dst,new Size(1600,900));
            //show
            HighGui.imshow("dst",dst);
            HighGui.resizeWindow("dst",1600,900);
            // show delay some ms auto close
            HighGui.waitKey(1000);
            // exit
            System.exit(0);
        }
    }

显示效果

![在这里插入图片描述][aa1c60c4fd2d4661898d3c9b17f67982.png]

## 三.其他测试 ##

package org.example;
    
    import org.opencv.core.Core;
    import org.opencv.core.CvType;
    import org.opencv.core.Mat;
    import org.opencv.core.Size;
    import org.opencv.highgui.HighGui;
    import org.opencv.imgcodecs.Imgcodecs;
    import org.opencv.imgproc.Imgproc;
    
    /**
     * @author Administrator
     */
    public class Main {
        
    
        /**
         * load opencv_java480
         */
        static {
        
            System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        }
    
    
        /**
         * 低通滤波器 均值滤波 使图像模糊、消除噪点
         */
        static float[] vague_shaper = new float[]{
        
                1/9,1/9,1/9,
                1/9,1/9,1/9,
                1/9,1/9,1/9
        };
    
        /**
         * 低通滤波器 高斯滤波 使图像模糊
         */
        static float[] gauss_shaper = new float[]{
        
                1/16,2/16,1/16,
                2/16,4/16,2/16,
                1/16,2/16,1/16
        };
    
        /**
         * 高通滤波器 锐化卷积核
         */
        static float[] sharpening = new float[]{
        
                -1,-1,-1,
                -1,8,-1,
                -1,-1,-1
        };
    
        /**
         * 一阶微算子 pre_witt 处理噪声多、灰度突变的图像
         */
        static float[] pre_witt = new float[]{
        
                -1,-1,-1,
                0,0,0,
                1,1,1
        };
    
        /**
         * 一阶微算子 sobel pre_witt 的改进版
         */
        static float[] sobel_vertical = new float[]{
        
                -1,0,1,
                -2,0,2,
                -1,0,1
        };
    
        /**
         * 一阶微算子 sobel pre_witt 的改进版
         */
        static float[] sobel_horizontal = new float[]{
        
                1,2,1,
                0,0,0,
                -1,-2,-1
        };
    
        public static void main(String[] args) {
        
    
    
    
            String imgF = "C:\\Users\\Administrator\\Desktop\\IMG_20220204_132906.jpg";
    
            Mat img = Imgcodecs.imread(imgF);
            Mat src = new Mat();
            Mat dst = new Mat();
            //重置大小
            Imgproc.resize(img,src,new Size(1600,900));
            int rows = src.rows();
            int cols = src.cols();
            int channels = src.channels();
            //展示
            HighGui.resizeWindow("dst",1600,900);
            HighGui.imshow("dst",src);
            HighGui.waitKey(0);
            //灰度化
            Imgproc.cvtColor(src,dst,Imgproc.COLOR_RGB2GRAY);
            HighGui.imshow("dst",dst);
            HighGui.waitKey(0);
            //定义卷积核
            Mat operator = new Mat(3,3, CvType.CV_32FC1);
            //模糊
            operator.put(0,0,vague_shaper);
            Imgproc.filter2D(src,dst,-1,operator);
            HighGui.imshow("vague_shaper",dst);
            HighGui.waitKey(0);
            //模糊
            operator.put(0,0,gauss_shaper);
            Imgproc.filter2D(src,dst,-1,operator);
            HighGui.imshow("gauss_shaper",dst);
            HighGui.waitKey(0);
            //高通
            operator.put(0,0,sharpening);
            Imgproc.filter2D(src,dst,-1,operator);
            HighGui.imshow("sharpening",dst);
            HighGui.waitKey(0);
            //pre_witt
            operator.put(0,0,pre_witt);
            Imgproc.filter2D(src,dst,-1,operator);
            HighGui.imshow("pre_witt",dst);
            HighGui.waitKey(0);
            //sobel_vertical
            operator.put(0,0,sobel_vertical);
            Imgproc.filter2D(src,dst,-1,operator);
            HighGui.imshow("sobel_vertical",dst);
            HighGui.waitKey(0);
            //sobel_horizontal
            operator.put(0,0,sobel_horizontal);
            Imgproc.filter2D(src,dst,-1,operator);
            HighGui.imshow("sobel_horizontal",dst);
            HighGui.waitKey(0);
            //二值化
            Mat gray = new Mat();
            Imgproc.cvtColor(src,gray,Imgproc.COLOR_RGB2GRAY);
            Imgproc.threshold(gray,dst,100,255,Imgproc.THRESH_BINARY);
            HighGui.imshow("binary",dst);
            HighGui.waitKey(0);
            //边缘检测
            Imgproc.Canny(src,dst,128,255);
            HighGui.imshow("edge",dst);
            HighGui.waitKey(0);
            //反色
            dst = src.clone();
            byte[] data = new byte[rows * cols * channels];
            dst.get(0,0,data);
            int index,r,g,b;
            for (int rs = 0 ; rs < rows ; rs++){
        
                //通道值横向排列
                for (int c = 0 ; c < cols * channels ; c = c + channels){
        
                    //取位置
                    index = rs * cols * channels + c;
                    //取RGB并翻转
                    b = 255 - data[index] & 0xff;
                    g = 255 - data[index + 1] & 0xff;
                    r = 255 - data[index + 2] & 0xff;
                    //回写
                    data[index] = (byte) b;
                    data[index + 1] = (byte) g;
                    data[index + 2] = (byte) r;
                }
            }
            dst.put(0,0,data);
            HighGui.imshow("overturn",dst);
            HighGui.waitKey(0);
    
            System.exit(0);
        }
        
    }

原图

![在这里插入图片描述][1cdfac771bd94274b8e27491bcbb4643.png]

灰度图

![在这里插入图片描述][a120b335f10843428533add154fd6e35.png]

锐化图

![在这里插入图片描述][42f7336622e6404d88de36ec959c1e82.png]

Prewitt 算子

![在这里插入图片描述][6b7b41544bab4a3b89e99a3429e31631.png]

sobel\_vertical

![在这里插入图片描述][bcd05101b9004d3a9d53e3afe73707d2.png]

sobel\_horizontal

![在这里插入图片描述][bdb57ce641bd4ab89dd6c61f53de7eb7.png]

binary

![在这里插入图片描述][ce9292e83c6047dd9f3e0546b5849679.png]

边缘检测

![在这里插入图片描述][8a413d971920459b82cf93f369315c29.png]

反色

![在这里插入图片描述][b34c71e14a954d35adc672ec26ffcde5.png]

[Open CV]: https://opencv.org/releases/
[dc94f697601c4e608e561cb92da312f4.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/83d5bc1944b6417faa7dde51cbec188a.png
[18c52126b7a34683b05f8d0ec65ccb64.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/efd1198459ba48b387aa7d888f0c485e.png
[2cec5e4a65174d9392c71236ac2ece44.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/0d0cc7b11dfe4af0a414e4d52b689721.png
[fb3593728dc54e8f86e5a0d4e225da40.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/407b66bdf4a54904863f4319c866a04a.png
[43426bf3a64c4be29a1ea779ac4ed3d6.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/343fa420bd354299b690346cbaae0635.png
[d8ddc83b79e3481f92e8b0050d47504f.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/9053e221d38247cdb380153a81fe7030.png
[aa1c60c4fd2d4661898d3c9b17f67982.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/80fbcfa3ae6d4672b62ba79ef3e374fa.png
[1cdfac771bd94274b8e27491bcbb4643.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/9949208fba6f4f888a8059012abb1b29.png
[a120b335f10843428533add154fd6e35.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/d59b0e57b833464ba24015e2c479d861.png
[42f7336622e6404d88de36ec959c1e82.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/2667080f47e04590b75220da97a68b1c.png
[6b7b41544bab4a3b89e99a3429e31631.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/08277223f125436a95738da45aa33be6.png
[bcd05101b9004d3a9d53e3afe73707d2.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/636f11fde0ae4214b88e98ce88f1cc42.png
[bdb57ce641bd4ab89dd6c61f53de7eb7.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/2ba4d65492874852a2bf58f2b836c5b5.png
[ce9292e83c6047dd9f3e0546b5849679.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/1c8a5a0ee75d4f63b8c9904bf891954e.png
[8a413d971920459b82cf93f369315c29.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/79f7f3e8188e44eda97b511b5ec3c97f.png
[b34c71e14a954d35adc672ec26ffcde5.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/02/05/0ae31f0f730c4b4fb40a4ae4e7063f9a.png