FeatureDetector vs. FeatureFinder

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FeatureFinder is a high-level class that abstracts feature detection + description. SIFT/SURF/ORB all describe a detection and a description scheme, but most of the time they are perceived as descriptors. Separating both will give you much more flexibility:

    Ptr<FeatureDetector> detector = 
        new PyramidAdaptedFeatureDetector(
            new DynamicAdaptedFeatureDetector(
                new FastAdjuster(20, true), 40, 60, 4),
            8
        );
    Ptr<DescriptorExtractor> descriptor = DescriptorExtractor::create("ORB");