如何将 cv::Mat 转换为 cv::Matx33f

我有一个cv::Mat我想转换成cv::Matx33f。我尝试这样做：

cv::Mat m;
cv::Matx33f m33;
.........
m33 = m;

但所有数据都会丢失！知道如何做到这一点吗？

UPDATE这是导致我的问题的代码的一部分：

cv::Point2f Order::warpPoint(cv::Point2f pTmp){
    cv::Matx33f warp = this->getTransMatrix() ; // the getter gives a cv::Mat back 
    transformMatrix.copyTo(warp); // because the first method didn't work, I tried to use the copyto function 

    // and the last try was 
    warp = cv::Matx33f(transformationMatrix); // and waro still 0 
    cv::Point3f  warpPoint = cv::Matx33f(transformMatrix)*pTmp;
    cv::Point2f result(warpPoint.x, warpPoint.y);
    return result;
}

要从 Mat 转换为 Matx，可以使用数据指针。例如，

cv::Mat m; // assume we know it is CV_32F type, and its size is 3x3

cv::Matx33f m33((float*)m.ptr());

假设连续内存以 m 为单位，这应该可以完成工作。您可以通过以下方式检查：

std::cout << "m " << m << std::endl;

std::cout << "m33 " << m33 << std::endl;