Features Finding and Images Matching

// structs

struct cv::detail::ImageFeatures;
struct cv::detail::MatchesInfo;

// classes

class cv::detail::AKAZEFeaturesFinder;
class cv::detail::AffineBestOf2NearestMatcher;
class cv::detail::BestOf2NearestMatcher;
class cv::detail::BestOf2NearestRangeMatcher;
class cv::detail::FeaturesFinder;
class cv::detail::FeaturesMatcher;
class cv::detail::OrbFeaturesFinder;
class cv::detail::SurfFeaturesFinder;