Mat.get equivalent for C++?

0
votes

I'm trying to duplicate an example for line detection from java to native code.

My Java code is as follows

int[] linesArray = new int[lines.cols() * lines.rows() * lines.channels()];
lines.get(0,0,linesArray); //the function in question. Reads Mat data into the lines array

for (int i=0; i < linesArray.length; i = i + 4)
{
    //loop through the data and do stuff       
}

but in C++ native code, there is no Mat::get() function. How can I read the data from my lines Mat into my linesArray

so far I have this for C++, mostly the same

int linesArray[lines.cols * lines.rows * lines.channels()];
lines.get(0,0,linesArray); //get is not a member of cv::Mat
c++opencvnative
unless lines.cols, lines.rows, and lines.channels() are all constexpr (which I suspect is not the case), you cannot use them for stack allocated arrays. You will need to heap allocate with either new or something like std::vector – Evan Teran
cv::Mat::data if you really need to get at the underlying array. For iteration there are iterators. – Dan Mašek
And just out of curiosity, what's in the body of that loop? – Dan Mašek
docs.opencv.org/master/d9/db0/tutorial_hough_lines.html – Premier Bromanov
tldr: just a line drawing function, but we resize our image to increase performance, so we need to also scale the points as well – Premier Bromanov