C++ 逆矩阵 OpenCV。Matrix.inv() 无法正常工作
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Inverse Matrix OpenCV. Matrix.inv() not working properly
提问by Ivánovick
I have one problem for which I could not find any solution.
我有一个问题，我找不到任何解决方案。
I have to make some calculations with the inverse of one known matrix.
我必须用一个已知矩阵的逆进行一些计算。
Matrix homography=
1.1688, 0.23, 62.2,
-0.013,1.225, -6.29,
0, 0, 1,
and then:
进而：
Mat homoInv=homography.inv();
The content of the matrix would be:
矩阵的内容将是：
1.81381e-29, 15.1628, -7.57361e+17,
0, -0, 0,
5.4561e-33, -2.40123e+34, -1.38198e-05
That of course is wrong as I already checked the result in Matlab. Both matrix are displayed and read as floats, and their depth is a 64FC1.
那当然是错误的，因为我已经在 Matlab 中检查了结果。两个矩阵都作为浮点数显示和读取，它们的深度是64FC1.
Does anyone have any idea of what could be done?
有没有人知道可以做什么？
Thanks All
谢谢大家
More code:
更多代码：
int main(int argc, char ** argv )
{
Mat homogra(3,3,CV_64FC1);
Mat coord(3,1,CV_64FC1);
Mat result(target.size(),CV_8UC1);
homogra.at<float>(0,0)=1.1688;
homogra.at<float>(0,1)=0.23;
homogra.at<float>(0,2)=(-62.20);
homogra.at<float>(1,0)=(-0.013);
homogra.at<float>(1,1)=1.225;
homogra.at<float>(1,2)=-6.29;
homogra.at<float>(2,0)=0;
homogra.at<float>(2,1)=0;
homogra.at<float>(2,2)=1;
printMatrix(homogra);
Mat inverse=homogra.inv();
printMatrix(inverse);
}
function printMatrix:
功能打印矩阵：
void printMatrix(Mat M){
cout<<"Tipo de matriz:"<<M.type()<<endl;
// dont print empty matrices
if (M.empty()){
cout << "---" << endl;
return;
}
// loop through columns and rows of the matrix
for(int i=0; i < M.rows; i++){
for(int j=0; j < M.cols ; j++){
cout << M.at<float>(i,j) << ", "<<endl;
}
cout<<"Change\n"<<endl;
}
}
But the error is not in printMatrix, as If i print the elements separately I obtain the same strange result in the numbers of inverse.
但错误不在printMatrix，因为如果我单独打印元素，我会在逆数中获得相同的奇怪结果。
回答by Ivánovick
The problem was, as Peter pointed out, in my code. I still don't understand the reason deeply but it is like:
正如彼得指出的那样，问题出在我的代码中。我仍然不明白其中的原因，但它就像：
I was treating the data CV_64Fas float, it is a mistake, it needs to be treated as double, for writing values and reading them.(<double>)
我将数据CV_64F视为浮点数，这是一个错误，需要将其视为双精度值，以便写入值和读取值。( <double>)
However CV_32Fcan be treated as float, the access would be with <float>.
但是CV_32F可以将其视为浮动，访问将使用<float>.
