I want to convert some codes from python to c++ .
for example we have 3 dimensional array like (25 * 40 * 10) and we want to separate array, in python we have numpy arrays and simply do it with:
Probs = Y[...,0]
Affines = Y[...,2:]
rx,ry = Y.shape[:2]
ywh = Y.shape[1::-1]
iwh = np.array(I.shape[1::-1],dtype=float).reshape((2,1))
but how can I implement this line in c++ with Mat?
assuming, you have something like this (e.g. from a dnn blob):
int sz[] = {
2, // batch size
3, // num channels
4, // H
5 // W
};
Mat m(4,sz,CV_32F);
cout << m.size << endl; // note: without () !!
then you can iterate over the outer "peels", and get a 2d slice to the most inner 2d images
for (int i=0t; i<m.size[0]; i++) {
for (int j=0; j<m.size[1]; j++) {
// get the most inner slice:
Mat inner(m.size[2], m.size[3], CV_32F, m.ptr<float>(i,j));
cout << i << " " << j << " " << inner.size() << endl;
}
}
output:
2 x 3 x 4 x 5
0 0 [5 x 4]
0 1 [5 x 4]
0 2 [5 x 4]
1 0 [5 x 4]
1 1 [5 x 4]
1 2 [5 x 4]
Asked: 2019-09-30 05:02:19 -0600
Seen: 127 times
Last updated: Sep 30 '19