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I'd start with simple/fast things, and if they fail i'll look for a more difficult/powerfull strategy as the other question suggested.

I'll try a simple template matching tecnique due to the controlled object to recognize. See this example to know how template matching works. The template can be a rectangle with the oval inside with white background (if the background is always white):

It is a fast approach and if it fails, you can try more complicated things.

I'd start with simple/fast things, and if they fail i'll look for a more difficult/powerfull strategy as the other question suggested.

I'll try a simple template matching tecnique technique due to the controlled object to recognize. See this example to know how template matching works. The template can be a rectangle with the oval inside with white background (if the background is always white):

It is a fast approach and if it fails, you can try more complicated things.