可以使用imgproc
类的warpAffine()
方法对图像执行旋转操作。以下是这种方法的语法 -
Imgproc.warpAffine(src, dst, rotationMatrix, size);
该方法接受以下参数 -
Mat
对象。Mat
对象。Mat
对象。示例
以下程序演示如何旋转图像。
package com.zyiz.geometric; 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 Rotation { 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 ="F:/worksp/opencv/images/transform_input.jpg"; Mat src = Imgcodecs.imread(file); // Creating an empty matrix to store the result Mat dst = new Mat(); // Creating a Point object Point point = new Point(300, 200); // Creating the transformation matrix M Mat rotationMatrix = Imgproc.getRotationMatrix2D(point, 30, 1); // Creating the object of the class Size Size size = new Size(src.cols(), src.cols()); // Rotating the given image Imgproc.warpAffine(src, dst, rotationMatrix, size); // Writing the image Imgcodecs.imwrite("F:/worksp/opencv/images/rotate_output.jpg", dst); System.out.println("Image Processed"); } }
假定以下是上述程序中指定的输入图像:transform_input.jpg
。
执行上面示例代码,得到以下结果 -