SIFT descriptor extraction, refer to rob hess source code, save each pyramid image for convenient as a demonstration and learning.

SIFT\include\opencv\cv.h
....\.......\......\cv.hpp
....\.......\......\cvaux.h
....\.......\......\cvaux.hpp
....\.......\......\cvwimage.h
....\.......\......\cxcore.h
....\.......\......\cxcore.hpp
....\.......\......\cxeigen.hpp
....\.......\......\cxmisc.h
....\.......\......\highgui.h
....\.......\......\ml.h
....\.......\......2\calib3d\calib3d.hpp
....\.......\.......\.ontrib\contrib.hpp
....\.......\.......\.......\detection_based_tracker.hpp
....\.......\.......\.......\hybridtracker.hpp
....\.......\.......\.......\openfabmap.hpp
....\.......\.......\.......\retina.hpp
....\.......\.......\..re\core.hpp
....\.......\.......\....\core_c.h
....\.......\.......\....\cuda_devptrs.hpp
....\.......\.......\....\devmem2d.hpp
....\.......\.......\....\eigen.hpp
....\.......\.......\....\gpumat.hpp
....\.......\.......\....\internal.hpp
....\.......\.......\....\mat.hpp
....\.......\.......\....\opengl_interop.hpp
....\.......\.......\....\opengl_interop_deprecated.hpp
....\.......\.......\....\operations.hpp
....\.......\.......\....\types_c.h
....\.......\.......\....\version.hpp
....\.......\.......\....\wimage.hpp
....\.......\.......\features2d\features2d.hpp
....\.......\.......\.lann\allocator.h
....\.......\.......\.....\all_indices.h
....\.......\.......\.....\any.h
....\.......\.......\.....\autotuned_index.h
....\.......\.......\.....\composite_index.h
....\.......\.......\.....\config.h
....\.......\.......\.....\defines.h
....\.......\.......\.....\dist.h
....\.......\.......\.....\dummy.h
....\.......\.......\.....\dynamic_bitset.h
....\.......\.......\.....\flann.hpp
....\.......\.......\.....\flann_base.hpp
....\.......\.......\.....\general.h
....\.......\.......\.....\ground_truth.h
....\.......\.......\.....\hdf5.h
....\.......\.......\.....\heap.h
....\.......\.......\.....\hierarchical_clustering_index.h
....\.......\.......\.....\index_testing.h
....\.......\.......\.....\kdtree_index.h
....\.......\.......\.....\kdtree_single_index.h
....\.......\.......\.....\kmeans_index.h
....\.......\.......\.....\linear_index.h
....\.......\.......\.....\logger.h
....\.......\.......\.....\lsh_index.h
....\.......\.......\.....\lsh_table.h
....\.......\.......\.....\matrix.h
....\.......\.......\.....\miniflann.hpp
....\.......\.......\.....\nn_index.h
....\.......\.......\.....\object_factory.h
....\.......\.......\.....\params.h
....\.......\.......\.....\random.h
....\.......\.......\.....\result_set.h
....\.......\.......\.....\sampling.h
....\.......\.......\.....\saving.h
....\.......\.......\.....\simplex_downhill.h
....\.......\.......\.....\timer.h
....\.......\.......\gpu\device\block.hpp
....\.......\.......\...\......\border_interpolate.hpp
....\.......\.......\...\......\color.hpp
....\.......\.......\...\......\common.hpp
....\.......\.......\...\......\datamov_utils.hpp
....\.......\.......\...\......\.etail\color_detail.hpp
....\.......\.......\...\......\......\reduce.hpp
....\.......\.......\...\......\......\reduce_key_val.hpp
....\.......\.......\...\......\......\transform_detail.hpp
....\.......\.......\...\......\......\type_traits_detail.hpp
....\.......\.......\...\......\......\vec_distance_detail.hpp
....\.......\.......\...\......\dynamic_smem.hpp
....\.......\.......\...\......\emulation.hpp
....\.......\.......\...\......\filters.hpp
....\.......\.......\...\......\funcattrib.hpp
....\.......\.......\...\......\functional.hpp
....\.......\.......\...\......\limits.hpp
....\.......\.......\...\......\reduce.hpp
....\.......\.......\...\......\saturate_cast.hpp
....\.......\.......\...\......\scan.hpp
....\.......\.......\...\......\static_check.hpp
....\.......\.......\...\......\transform.hpp
....\.......\.......\...\......\type_traits.hpp
....\.......\.......\...\......\utility.hpp
....\.......\.......\...\......\vec_distance.hpp
....\.......\.......\...\......\vec_math.hpp
....\.......\.......\...\......\vec_traits.hpp
....\.......\.......\...\......\warp.hpp
....\.......\.......\...\......\warp_reduce.hpp
....\.......\.......\...\......\warp_shuffle.hpp
....\.......\.....

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