I try to convert buffered data in cv::Mat
(it's originaly to make a python binding numpy array to cv::Mat)
my code here https://github.com/edmBernard/pybind11_opencv_numpy
in python when we do channel slicing the internal strides in "simply" set to 3 instead of 1 (there is no copy)
a = eb.read_image("test.png")
b=a[:,:,0]
so b is not continuous
In full opencv C++, it's equivalente to try to get only one channel from a CV_8UC3 image.
I try this but it don't seem to work as I think
// arr is my buffer (raw data)
cv::Mat(cv::Size(shape[1], shape[0]),
dtype_cv,
arr.mutable_data(),
image_from_file.elemSize()*image_from_file.cols*3);
// another solution with the same result
// here info.ptr is my buffer
cv::Mat(ndims,
&shape[0],
dtype
info.ptr&strides[0]);
edit : there is some misunderstanding of my problem I try to be cleaner
↧
