I am trying to create an array of Mat objects to store images and am getting warnings for using anything other than a statically typed number such as 10
int numberOfRects = boundRect.size();
Mat image_array[numberOfRects];
When I try this code I get an error stating Variable length array of non-POD element type 'cv::Mat'
Same goes for this code: Mat image_array[boundRect.size()];
How can I create an array of Mats based on the size of boundRect?
You need to create a dynamic array. This is a basic, but non-simple aspect of the language to learn, so I suggest you learn on some simple examples First.
You can create it like this
Mat *image_array = new Mat[numberOfRects];
But must delete it when you are done, otherwise there will be a memory leak.
delete[] image_array;
A better alternative is to use std::vector, which automatically deletes its contents. But a class must be copyable to be used in it, and I don't know what's allowed by this Mat class of yours. It would look like
std::vector<Mat> image_array(numberOfRects);
If Mat cannot be copied, the correct C++11 solution is to use a vector of smart pointers.
std::vector<std::unique_ptr<Mat>> image_array(numberOfRects);
for (auto& mat : image_array)
{
mat = std::make_unique<Mat>();
}
