在Java语言编程中，如何使用Java旋转图片？

注意：需要访问网址：http://book2s.com/java/jar/o/opencv/download-opencv-3.2.0-0.html ， 下载一个OpenCV软件包。这里下载最新版本：opencv-3.2.0-vc14.exe并解压此文件到D:\software\opencv目录中。

项目结构如下图所示 -

添加一个用户自定义库：OpenCV3.2，并指配置构建路径为：D:\software\opencv\opencv\build\java\x64，如下图所示 -

注：可参考： http://blog.csdn.net/shawncheer/article/details/51098456

以下是使用Java旋转图片的程序 -

package com.yiibai;

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");
   }
}

执行上面示例代码，得到以下结果 -

Image processed

原图 -

在执行上面示例代码成功后，应该会在 F:\worksp\javaexamples\java_opencv\images 目录中有看到生成一个文件：rotate_output.jpg 。

问题

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)

解决上述问题可通过参考： http://blog.csdn.net/shawncheer/article/details/51098456

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