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takiyu/cv_m_creation.cpp

Created May 23, 2017 12:17
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Sample of cv::Mat creation from const float*
Raw
cv_m_creation.cpp
#include <iostream>
#include <opencv2/core.hpp>
int main(int argc, char const* argv[]) {
static const float d[] = {1, 2, 3};
cv::Mat m(1, 3, CV_32FC1, const_cast<float *>(d));
printf("Address d: %p\n", d);
printf("Address m: %p\n", m.data);
// Calculation with changes
// std::cout << "prev: " << m.at<float>(0) << std::endl;
// m.at<float>(0) += 1; // Cause segmentation fault
// std::cout << "post: " << m.at<float>(0) << std::endl;
// Calculation with no changes
float res = m.dot(m);
std::cout << res << std::endl;
return 0;
}
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