How to determine the presence of a break in the picture?

Question

JavaScript

There is a canvas on which the figure is drawn. We need an algorithm to determine whether there is one object or several in the figure. Where can one find such an algorithm?

Thanks

Answer 1

Breadth or depth traversal algorithm. It is also called the fill algorithm. Google it. If in one fill you painted over all the black pixels, then there is only one shape. Otherwise, if there is more than one component, there is a gap.

Answer 2

Regionprops function in Matlab (Image Processing toolbox)