How to recognize objects in a picture?

Question

Pattern recognition

It is necessary to recognize approximate such simple figures, by the least resource-intensive method.
You need to find the location of the figure. The size is always the same. In principle, you need to look for 1 type of figures. For example, a red circle and do not confuse it with a square of the same size. Many circles are an example of overlap, you need to find the position of at least one.

Answer 1

OpenCV. At least start with this. Under python, something more concise or simple still needs to be looked for.