如何使用java旋轉圖片?

2019-10-16 22:26:39

在Java語言程式設計中,如何使用Java旋轉圖片?

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旋轉圖片的程式 -

package com.yiibai;

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