how to replicate matlab's imrotate in opencv c++? - c++

Question

Edit: Added the function code for matlabImrotate.
I need to translate code from matlab that uses this function.
some of the times it appears like this: imrotate(double(im), d, 'bilinear','crop');.
At other times it appears like this: imrotate(im_mask, rotation_angle, 'crop');
I tried to use the answer in how to implement Imrotate of Matlab in Opencv? , but got different results.
For example, by using the code from this link inside a function:
bool matlabImrotate(Mat& src, double angle, int interpolationMethod, Mat& dst)
{
// src: https://stackoverflow.com/questions/38715363/how-to-implement-imrotate-of-matlab-in-opencv
try
{
// Special Cases
if (fmod(angle, 360.0) == 0.0)
dst = src;
else {
Point2f center(src.cols / 2.0F, src.rows / 2.0F);
Mat rot = cv::getRotationMatrix2D(center, angle, 1.0);
// determine bounding rectangle
Rect bbox = RotatedRect(center, src.size(), angle).boundingRect();
// adjust transformation matrix
//rot.at<double>(0, 2) += bbox.width / 2.0 - center.x;
//rot.at<double>(1, 2) += bbox.height / 2.0 - center.y;
warpAffine(src, dst, rot, bbox.size(), interpolationMethod);
}
return true;
}
catch (exception& e)
{
cout << "Error in matlabImrotate - " << e.what() << endl;
return false;
}
}
and the following code:
double data[9]{
0, 0, 3,
4, 5, 0,
0, 0, 9 };
Mat A = Mat(3, 3, CV_64F, data);
matlabImrotate(A, -5, INTER_LINEAR, A);
cout << "A:" << endl;
cout << A << endl;
cout << endl;
I got the result:
A:
[0.4375, 0.3046875, 2.54296875, 0.328125, 0, 0;
3.390625, 4.8134765625, 0.2421875, 0.0234375, 0, 0;
0, 0.2724609375, 8.4462890625, 0, 0, 0;
0, 0, 0.4921875, 0, 0, 0;
0, 0, 0, 0, 0, 0;
0, 0, 0, 0, 0, 0]
instead of matlab's:
A =
1.2127 0.3141 1.2084
2.5963 5.0000 1.2278
0 3.2512 3.6252