检索从变形的图像拍摄的像素的原始坐标

Question

我具有由sourceImage萃取四角：

src_vertices[0] = corners[upperLeft]; 
src_vertices[1] = corners[upperRight]; 
src_vertices[2] = corners[downLeft]; 
src_vertices[3] = corners[downRight]; 

这些四角翘曲到destinationImage那样：

dst_vertices[0] = Point(0,0); 
dst_vertices[1] = Point(width, 0); 
dst_vertices[2] = Point(0, height); 
dst_vertices[3] = Point(width, height); 

Mat warpPerspectiveMatrix = getPerspectiveTransform(src_vertices, dst_vertices); 
cv::Size size_d = Size(width, height); 
cv::Mat DestinationImage(width,height,CV_8UC3); 
warpPerspective(sourceImage, destinationImage, warpPerspectiveMatrix, size_d, INTER_LINEAR, BORDER_CONSTANT); 

现在我的问题是：

我有一个点p（x，y）米destinationImage我怎么能检索该点的坐标在原sourceImage

换句话说，我想用warpPerspectiveMatrix做getPerspectiveTransform

Answer 1

相反的工作你想逆透视变换。如果你原来的变换S-> S '你想变换矩阵S' - >取值

Mat InversewarpPerspectiveMatrix = getPerspectiveTransform(dst_vertices, src_vertices); 

然后你做一个稀疏矩阵

Mat PerspectiveCoordinates containing the vector x,y. 

最后要拨打

PerspectiveTransform(PerspectiveCoordinates,OriginalCoordinates,InversewarpPerspectiveMatrix)