opencv perspectiveTransform函数异常

Question

如何使用perspectiveTransform函数？

当我的代码运行时，会产生以下异常：

OpenCV Error: Assertion failed (scn + 1 == m.cols && (depth == CV_32F || depth == CV_64F)) in perspectiveTransform, file /Users/donbe/Documents/opencv/opencv/modules/core/src/matmul.cpp, line 1916

谁能帮我？

我下面的代码：

Point2f srcTri[4]; 
Point2f dstTri[4]; 

Mat warp_mat; 
Mat src; 

/// Load the image 
src = imread(argv[1], 1); 

srcTri[0] = Point2f(0,0); 
srcTri[1] = Point2f(src.cols,0); 
srcTri[2] = Point2f(src.cols,src.rows); 
srcTri[3] = Point2f(0,src.rows); 

dstTri[0] = Point2f(0,0); 
dstTri[1] = Point2f(src.cols/2,0); 
dstTri[2] = Point2f(src.cols/2,src.rows); 
dstTri[3] = Point2f(0,src.rows); 


warp_mat = getPerspectiveTransform(srcTri, dstTri); 

Mat warp_dst(src.size(), src.type());  

//There will produce a exception. 
perspectiveTransform(src, warp_dst, warp_mat); 

namedWindow("Warp", CV_WINDOW_AUTOSIZE); 
imshow("Warp", warp_dst); 

waitKey(0); 
return 0; 

Answer 1

你检查你的源图像，它检查的要求？

void perspectiveTransform(InputArray src, OutputArray dst, InputArray mtx) 

Parameters: 

src – Source two-channel or three-channel floating-point array. Each element is a 2D/3D vector to be transformed. 
dst – Destination array of the same size and type as src . 
mtx – 3x3 or 4x4 floating-point transformation matrix. 

注：

函数变换稀疏集合2D或3D矢量。如果要使用透视转换来转换图像，请使用warpPerspective（）。

查询详细的文档：http://opencv.itseez.com/modules/core/doc/operations_on_arrays.html?highlight=perspectivetransform#cv2.perspectiveTransform

希望这有助于。

Answer 2

在我的情况下，我也被卡住了相同的错误，问题是与InputArray mtx的类型。将CvMat * obj的类型更改为CV_32FC1而不是CV_8UC1后解决了它！