如何使用java旋轉圖片？

在Java語言編程中，如何使用Java旋轉圖片？

注意：需要訪問網址：http://book2s.com/java/jar/o/opencv/download-opencv-3.2.0-0.html ， 下載一個OpenCV軟體包。這裏下載最新版本：opencv-3.2.0-vc14.exe並解壓此檔到D:\software\opencv目錄中。

專案結構如下圖所示 -

添加一個用戶自定義庫：OpenCV3.2，並指配置構建路徑為：D:\software\opencv\opencv\build\java\x64，如下圖所示 -

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

以下是使用Java旋轉圖片的程式 -

package com.zaixian;

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

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

public class RotatingAnImage {
   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 src = Imgcodecs.imread(file);

      //Creating an empty matrix to store the result
      Mat dst = new Mat();

      //Creating the transformation matrix M
      Mat rotationMatrix = Imgproc.getRotationMatrix2D(new Point(300, 200), 30, 1);

      //Rotating the given image
      Imgproc.warpAffine(src, dst,rotationMatrix, new Size(src.cols(), src.cols()));

      //Writing the image
      Imgcodecs.imwrite("images/rotate_output.jpg", dst);
      System.out.println("Image Processed");
   }
}

執行上面示例代碼，得到以下結果 -

Image processed

原圖 -

在執行上面示例代碼成功後，應該會在 F:\worksp\javaexamples\java_opencv\images 目錄中有看到生成一個檔：rotate_output.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.zaixian.CopyAndPasteAnImage.main(CopyAndPasteAnImage.java:13)

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