image-processing - 检索从变形图像获取的像素的原始坐标

我从sourceImage中提取了四个角:

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

这四个角将像这样扭曲到destinationImage:

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:

我有一个从destinationImage取得的点p(x，y)，如何在原始sourceImage中检索此点的坐标

换句话说，我想使用warpPerspectiveMatrix来完成getPerspectiveTransform的相反工作

最佳答案

您需要逆透视变换。如果原始转换为S-> S'，则需要转换矩阵S'-> S

Mat InversewarpPerspectiveMatrix = getPerspectiveTransform(dst_vertices, src_vertices);

然后制作一个SPARSE矩阵

Mat PerspectiveCoordinates containing the vector x,y.

最后你要打电话

PerspectiveTransform(PerspectiveCoordinates,OriginalCoordinates,InversewarpPerspectiveMatrix)