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I suggest using one of the three corner detectors HERE. Then check each of the corners to see if they are the intersection of yellow and black. The intersection in the center and probably the edges should appear brightly.

I suggest extracting a small box around each corner you find, and checking if it's about half black and half yellow. You'll have to come up with a good range of what yellow is, but that should be a simple task if you have a few sample images.