opencv3_java 图像透视视角转换Perspective warpPerspective

package opencv_java_demo;

import java.util.List;
import org.opencv.core.*;
import org.opencv.imgcodecs.*;
import org.opencv.imgproc.*;
import org.opencv.utils.Converters;

public class Perspective {

public static void main(String[] args) {
try{
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

Mat src=Imgcodecs.imread("./images/lenna.jpg");
//读取图像到矩阵中
if(src.empty()){
throw new Exception("no file");
}

int xMargin,yMargin;
int x0=src.cols()/4;
int x1=(src.cols()/4)*3;
int y0=src.cols()/4;
int y1=(src.cols()/4)*3;
Mat dst=new Mat();

List<Point> listSrcs=java.util.Arrays.asList(new Point(x0,y0),new Point(x0,y1),new Point(x1,y1),new Point(x1,y0));
Mat srcPoints=Converters.vector_Point_to_Mat(listSrcs,CvType.CV_32F);

xMargin=src.cols()/10;
yMargin=src.rows()/10;
List<Point> listDsts=java.util.Arrays.asList(new Point(x0+xMargin,y0+yMargin),listSrcs.get(1),listSrcs.get(2),new Point(x1-xMargin,y0+yMargin));
Mat dstPoints=Converters.vector_Point_to_Mat(listDsts,CvType.CV_32F);

Mat perspectiveMmat=Imgproc.getPerspectiveTransform(srcPoints, dstPoints);
Imgproc.warpPerspective(src, dst, perspectiveMmat, src.size(),Imgproc.INTER_LINEAR);
Imgcodecs.imwrite("./images/dst0.jpg",dst);

xMargin=src.cols()/8;
yMargin=src.cols()/8;
listDsts.set(0, listSrcs.get(0));
listDsts.set(1, listSrcs.get(1));
listDsts.set(2, new Point(x1-xMargin,y1-yMargin));
listDsts.set(3, new Point(x1-xMargin,y0-yMargin));
dstPoints=Converters.vector_Point_to_Mat(listDsts,CvType.CV_32F);

perspectiveMmat=Imgproc.getPerspectiveTransform(srcPoints, dstPoints);
Imgproc.warpPerspective(src, dst, perspectiveMmat, src.size(),Imgproc.INTER_LINEAR);
Imgcodecs.imwrite("./images/dst1.jpg", dst);

xMargin=src.cols()/6;
yMargin=src.cols()/6;
listDsts.set(0, new Point(x0+xMargin,y0+yMargin));
listDsts.set(1, listSrcs.get(1));
listDsts.set(2, new Point(x1-xMargin,y1-yMargin));
listDsts.set(3, listSrcs.get(3));
dstPoints=Converters.vector_Point_to_Mat(listDsts,CvType.CV_32F);

perspectiveMmat=Imgproc.getPerspectiveTransform(srcPoints, dstPoints);
Imgproc.warpPerspective(src, dst, perspectiveMmat, src.size(),Imgproc.INTER_LINEAR);

Imgcodecs.imwrite("./images/dst2.jpg", dst);
}catch(Exception e){
System.out.println("例外：" + e);
}

}

}