Typing seems OK here...

OpsTyping.java

//
// OpsTyping.java
//

import net.imglib2.type.numeric.ComplexType;
import net.imglib2.type.numeric.RealType;

public class OpsTyping {

	public <V extends ComplexType<V>> void complex(V arg) {
		//
	}
	
	public <T extends RealType<T>> void real(T arg) {
		complex(arg);
	}
	
	public <V extends ComplexType<V>> void complexOp(ComplexOp<V> op) {
		
	}

	public <T extends RealType<T>> void realOp(RealOp<T> op) {
		complexOp(op);
	}

	public class ComplexOp<V extends ComplexType<V>> { }
	
	public class RealOp<T extends RealType<T>> extends ComplexOp<T> { }

}