如何使用java繪製幾何形狀到圖片?

2019-10-16 22:26:28

在Java語言程式設計中,如何使用Java繪製幾何形狀到圖片?

注意:需要存取網址:http://book2s.com/java/jar/o/opencv/download-opencv-3.2.0-0.html , 下載一個OpenCV軟體包。這裡下載最新版本:opencv-3.2.0-vc14.exe並解壓此檔案到D:\software\opencv目錄中。

專案結構如下圖所示 -

新增一個使用者自定義庫:OpenCV3.2,並指組態構建路徑為:D:\software\opencv\opencv\build\java\x64,如下圖所示 -

註:可參考: http://blog.csdn.net/shawncheer/article/details/51098456

以下是使用Java繪製幾何形狀到圖片的程式 -

package com.yiibai;

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.Point;
import org.opencv.core.Scalar;

import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

public class DrawingshapesOnImage {
    public static void main(String args[]) {

        // Loading the OpenCV core library
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

        // Reading the Image from the file and storing it in to a Matrix object
        String file = "images/zhonglou.jpg";
        Mat matrix = Imgcodecs.imread(file);

        /*
         * //Drawing an Ellipse Imgproc.ellipse(matrix, //Matrix obj of the
         * image new RotatedRect( new Point(20, 150),new Size(260, 180), 180 ),
         * //RotatedRect(Point c, Size s, double a) new Scalar(0, 0, 255),
         * //Scalar object for color 10); //Thickness of the line
         */

        // Drawing a Rectangle
        Imgproc.rectangle(matrix, // Matrix obj of the image
                new Point(10, 10), // p1
                new Point(390, 390), // p2
                new Scalar(0, 100, 255), // Scalar object for color
                5); // Thickness of the line

        // Writing image
        Imgcodecs.imwrite("images/drawingShapesOnImage.jpg", matrix);
        System.out.println("Image processed");
    }
}

執行上面範例程式碼,得到以下結果 -

Image processed

原圖 -

海口鐘樓

在執行上面範例程式碼成功後,應該會在 F:\worksp\javaexamples\java_opencv\images 目錄中有看到生成一個檔案:drawingShapesOnImage.jpg

問題

F:\worksp\javaexamples\java_opencv
Exception in thread "main" java.lang.UnsatisfiedLinkError: no opencv_java320 in java.library.path
    at java.lang.ClassLoader.loadLibrary(Unknown Source)
    at java.lang.Runtime.loadLibrary0(Unknown Source)
    at java.lang.System.loadLibrary(Unknown Source)
    at com.yiibai.CopyAndPasteAnImage.main(CopyAndPasteAnImage.java:13)

解決上述問題可通過參考: http://blog.csdn.net/shawncheer/article/details/51098456