I try to convert buffered data in cv::Mat
(it's originaly to make a python binding numpy array to cv::Mat)
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
cv::Mat image_from_file = cv::imread("test.png", CV_LOAD_IMAGE_COLOR);
cv::Mat image_transform = cv::Mat(cv::Size(image_from_file.cols, image_from_file.rows),
CV_8UC1, // output type one channel
image_from_file.data, // buffered data
image_from_file.elemSize()*image_from_file.cols*3 // total byte size of one rows
);
cv::imshow("image_split_channel_from_buffer", image_transform);
cv::waitKey(0);
the other interface with step parameter give me the same result :
cv::Mat::Mat ( int ndims,
const int * sizes,
int type,
void * data,
const size_t * steps = 0
)
↧
