将Point2f []作为Javacv中getAffineTransform()的参数传递

时间:2015-07-02 12:23:54

标签: java c++ opencv javacv affinetransform

我正在尝试使用javacv在java中实现面向对齐实现C ++位here,但我坚持如何传递

point2f []为getAffineTransform()中的point2f。

这是我能够提出的;

    //face alignment begin
Point2f[] srcTri = new Point2f[3];
Point2f[] dstTri = new Point2f[3];

Mat src_mat= new Mat(orig);
Mat dst_mat= new Mat(input);
Mat warp_mat = new Mat( 2, 3, CV_32FC1);

//Set the dst image the same type and size as src
Mat warp_dst = new Mat(src_mat.rows(), src_mat.cols(), src_mat.type());

//Set your 3 points to calculate the  Affine Transform
srcTri[0] = new Point2f((float)landmarks[5*2], (float)landmarks[5*2+1]);
srcTri[1] = new Point2f((float)landmarks[6*2], (float)landmarks[6*2+1]);
srcTri[2] = new Point2f((float)landmarks[0*2], (float)landmarks[0*2+1]);

dstTri[0] = new Point2f((float)landmarks[5*2], (float)landmarks[5*2+1]);
dstTri[1] = new Point2f((float)landmarks[6*2], (float)landmarks[6*2+1]);
dstTri[2] = new Point2f((float)landmarks[0*2], (float)landmarks[0*2+1]);

//Get the Affine Transform 
warp_mat = getAffineTransform( srcTri, dstTri ); //This is where I have problems. getAffineTransform() expects Point2f but I have Point2f[]

//Apply the Affine Transform just found to the src image
warpAffine(src_mat, warp_dst, warp_mat, warp_dst.size()); 

//show images
imshow("src", src_mat);
imshow("dst", dst_mat);
imshow("warp_dst", warp_dst);
waitKey(0);

//face alignment end

有人请告诉我如何将srcTri和dstTri作为Point2f传递给getAffineTransform()或如何将Point2f []转换为Point2f。甚至可以这样做吗? 怎样才能将地标变成Point2f,可以在getAfflineTransform()中作为参数接受?

我很乐意感谢您对如何在这里导航的帮助。

1 个答案:

答案 0 :(得分:1)

我相信这就是答案:https://groups.google.com/d/msg/javacv/dbWTNCHFyeg/Q6k59GPavgsJ

  

Point2fPointer,其作用类似于原生数组:   http://bytedeco.org/javacpp-presets/opencv/apidocs/org/bytedeco/javacpp/opencv_core.Point2f.html

     

我们可以使用Pointer来执行此类操作来访问元素   本机数组:   http://bytedeco.org/javacpp/apidocs/org/bytedeco/javacpp/Pointer.html#position-int-

     

查看README文件以获取CvPoint的示例:   https://github.com/bytedeco/javacv#sample-usage现在做同样的事情,   但是Point2f

所以你的代码应该像这样修改:

Point2f srcTri = new Point2f(3);
Point2f dstTri = new Point2f(3);

// ...

srcTri.position(0).x((float)landmarks[5*2]).y((float)landmarks[5*2+1]);
srcTri.position(1).x((float)landmarks[6*2]).y((float)landmarks[6*2+1]);
srcTri.position(2).x((float)landmarks[0*2]).y((float)landmarks[0*2+1]);
// and do the same for dstTri

warp_mat = getAffineTransform( srcTri.position(0), dstTri.position(0) );