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I want to understand if I should prefer to use the matrix operations defined for the cv::Mat class of OpenCV or if their computational time is the same of iterating with for loop on array of doubles.

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1  
Have you tried measuring it? –  KeillЯandor 2 hours ago

1 Answer 1

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OpenCV cv::Mat classes use pointers in order to make them as efficient as possible. That being said, if you want to do a very specific manipulation you may find it quicker to implement yourself.

Below is the simple cv::Mat transpose code from the OpenCV Source Code:

void MatOp::transpose(const MatExpr& expr, MatExpr& res) const
{
Mat m;
expr.op->assign(expr, m);
MatOp_T::makeExpr(res, m, 1);
}
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This seems to be CUDA code, what is its relation to the question? –  anderas 1 hour ago
    
changed the code, the point is OpenCV is optimised unless you have a very specific example –  GPPK 1 hour ago

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