如何使用Java(讀/寫)讀取複製和貼上圖片?

2019-10-16 22:26:10

在Java語言程式設計中,如何使用Java(讀/寫)讀取複製和貼上圖片?

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複製和貼上影象的程式 -

package com.yiibai;

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.imgcodecs.Imgcodecs;

// opencv-3.2.0.jar 下載地址:http://github.com/opencv/opencv/releases/tag/3.3.0

public class CopyAndPasteAnImage {
    public static void main(String args[]) {
        String propath = System.getProperty("user.dir");
        System.out.println(propath);
        // 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 = propath+"/images/mydog.jpg";

        Mat matrix = Imgcodecs.imread(file);
        System.out.println("Image Loaded ..........");
        String file2 = propath+"/images/mydogResaved.jpg";

        // Writing the image
        Imgcodecs.imwrite(file2, matrix);
        System.out.println("Image Saved ............");
    }
}

執行上面範例程式碼,得到以下結果 -

F:\worksp\javaexamples\java_opencv
Image Loaded ..........
Image Saved ............

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:mydogResaved.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