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Detect markers position in 2D images

Hi there, I am trying to detect the position of multiple markers in a single 2D image.

For example in the following image:

image description

I need to detect the position of the four markers.

I already manage to do this tutorial in java

But it only finds out one match, how do I change it to found more matches?

Is it possible to put it inside a loop and keep finding matches till a minValue is not reached?

Thank you so much in advance, I am new to OpenCV =/