type traits for OpenCV data types

Question

I have a template method in which a Mat object is constructed. The type of this matrix depends on the template implementation:

template <typename T>
void createMatrixAndDoStuff(int rows, int cols){
// ...
Mat A(rows,cols,getCVtype<T>::value);
// ...
}

In this case I use a basic trait, getCVType<T>::value will return CV_32F if T=float, etc. I know this is silly, because I could have used Mat_<T>(rows,cols) and forget about using traits for this. But it made me think: is there any available trait (or any template stuff) in OpenCV to infer type macros (CV_32F,CV_8U,...) in compile time from types?

AFAIK there are not, but you could easily implement them your own. — Germán Diago
– Germán Diago, Commented Aug 27, 2014 at 9:17
@GermánDiago that's what I thought in the first place, I already implemented this getCVtype trait thingy :) But still, it is strange that no methods are provided in the OpenCV API, isn't it? — Яois
– Яois, Commented Aug 27, 2014 at 9:22
Well, the API was coming from C mostly, so I wouldn't be surprised if they don't provide that. — Germán Diago
– Germán Diago, Commented Aug 27, 2014 at 10:11

StereoMatching · Accepted Answer · 2015-07-22 17:34:02Z

6

opencv do have the type traits for this task, it called cv::DataType, you do not need to create one by yourself

static_assert(cv::DataType<float>::type == CV_32F, 
              "cv::DataType<float>::type == CV_32F");
static_assert(cv::DataType<uchar>::type == CV_8U, 
              "cv::DataType<uchar>::type == CV_8U");
static_assert(cv::DataType<cv::Vec3b>::type == CV_8UC3, 
              "cv::DataType<cv::Vec3b>::type == CV_8UC3");

answered Jul 22, 2015 at 17:34

StereoMatching

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