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There isn't a single technique out there in OpenCV that will give you a multiple class detector. Your best approach is to build two detectors, for each seperate class and combine them together in a search for candidates in order to detect both classes.
If the object remains the same, using techniques like SIFT and SURF to define feature points and match them is a possibility.
If however intra-class variation exists, you could try to build a model for each class, using the cascade classifier approach.
Give us more detail about your exact needs.
