如何使用java旋转图像。（How to rotate an image using java.）

问题描述 (Problem Description)

如何使用java旋转图像。

解决方案 (Solution)

以下是使用java旋转图像的程序。

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 = "C:/opencv/logo.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("C:/opencv/rotate_output.jpg", dst);
      System.out.println("Image Processed");
   }
}

输入 (Input)

输出 (Output)