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this is more a c++ problem.

if you want to use push_back() , you have to start with an empty vector, not one with 3 empty Mat's in it.

the way you do it now, leads to 6 Mat's in your vector, the 1st 3 being invalid.

this is more a c++ problem.

if you want to use push_back() , you have to start with an empty vector, not one with 3 empty Mat's in it.

the way you do it now, leads to 6 Mat's in your vector, the 1st 3 being invalid.

maybe you want to brush up your c++ skills, and look at initializer lists, like:

vector<Mat> finalImgCh {Norm_b,Norm_g,Norm_r}; // c++11 way