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It is a bit confusing at first, but this kind of input gives you some freedom about the input type. You do not pass a image as input, rather a array of elements which represents your 2D point set.

It can be:

1. std::vector<cv::Point2f>
2. std::vector<cv::Vec2f>
3. cv::Mat with N lines and 1 column, with type CV_32FC2, each element consists in 2 floating point members) , such that can be represented by cv::Vec2f

Particularly, I use mostly the first option to represent the point set. If you don't know what is std::vector container, I suggest you give a look in some tutorials of STL containers here. Understand those containers is helpful to you understand certain OpenCV functions and structures.

It is a bit confusing at first, but this kind of input gives you some freedom about the input type. You do not pass a image as input, rather a array of elements which represents your 2D point set.

It can be:

1. std::vector<cv::Point2f>
2. std::vector<cv::Vec2f>
3. cv::Mat with N lines and 1 column, with type CV_32FC2, each element consists in 2 floating point members) , such that can be represented by cv::Vec2f

Particularly, I use mostly the first option to represent the point set. If you don't know what is std::vector container, I suggest you give a look in some tutorials of STL containers here. Understand those containers is helpful to you understand certain OpenCV functions and structures.