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Hi, There is no easy way to use SIFT features in stitching module. You have to create separate class like "detail::SiftFeaturesFinder" to do it. New class should be added in "opencv/modules/stitching/src/matchers.cpp" and "opencv/modules/stitching/include/opencv2/stitching/detail/matchers.hpp"
This should be rather easy, because all process relay on extracting features. If you need to set only specific region for keypoint extraction, you need to build black-white mask -> your new class should take it too.
All work need changes in OpenCV, so after all you need to recompile it.
