Describe: David G. Lowe displayed the SIFT algorithm. There are many explanations. User-friendly, suitable for beginners.

File list(time 1999100509~2009122410)(Click to check if it's the file you need, and recomment it at the bottom):
  SIFTtutorial
  ............\add_descriptors_to_database.m
  ............\display_keypoints.m
  ............\empty_descriptor_database.m
  ............\find_nearest_neighbours.m
  ............\fit_robust_affine_transform.m
  ............\gaussian_filter.m
  ............\get_linear_index.m
  ............\get_multiple_indices.m
  ............\hough.m
  ............\images
  ............\......\einstein.key
  ............\......\einstein.key.mat
  ............\......\einstein.pgm
  ............\......\nutshell0003.key
  ............\......\nutshell0003.key.mat
  ............\......\nutshell0003.mask
  ............\......\nutshell0003.pgm
  ............\......\nutshell0004.key
  ............\......\nutshell0004.key.mat
  ............\......\nutshell0004.pgm
  ............\......\nutshell0007.key
  ............\......\nutshell0007.key.mat
  ............\......\nutshell0007.pgm
  ............\......\nutshell0008.key
  ............\......\nutshell0008.key.mat
  ............\......\nutshell0008.pgm
  ............\......\nutshell0009.key
  ............\......\nutshell0009.key.mat
  ............\......\nutshell0009.pgm
  ............\......\nutshell0010.key
  ............\......\nutshell0010.key.mat
  ............\......\nutshell0010.pgm
  ............\......\nutshell0011.key
  ............\......\nutshell0011.key.mat
  ............\......\nutshell0011.pgm
  ............\......\nutshell0012.key
  ............\......\nutshell0012.key.mat
  ............\......\nutshell0012.pgm
  ............\......\phone0003.key
  ............\......\phone0003.key.mat
  ............\......\phone0003.mask
  ............\......\phone0003.pgm
  ............\......\phone0005.key
  ............\......\phone0005.key.mat
  ............\......\phone0005.pgm
  ............\......\phone0007.key
  ............\......\phone0007.key.mat
  ............\......\phone0007.pgm
  ............\......\phone0016.key
  ............\......\phone0016.key.mat
  ............\......\phone0016.pgm
  ............\......\phone0017.key
  ............\......\phone0017.key.mat
  ............\......\phone0017.pgm
  ............\......\phone0018.key
  ............\......\phone0018.key.mat
  ............\......\phone0018.pgm
  ............\......\wadham001.key
  ............\......\wadham001.key.mat
  ............\......\wadham001.pgm
  ............\......\wadham002.key
  ............\......\wadham002.key.mat
  ............\......\wadham002.pgm
  ............\......\wadham003.key
  ............\......\wadham003.key.mat
  ............\......\wadham003.pgm
  ............\......\wadham004.key
  ............\......\wadham004.key.mat
  ............\......\wadham004.pgm
  ............\......\wadham005.key
  ............\......\wadham005.key.mat
  ............\......\wadham005.pgm
  ............\imWarpAffine.m
  ............\read_keypoint_file.m
  ............\read_lowe_keypoints.m
  ............\resizeImageFig.m
  ............\SIFT.m
  ............\SIFT_from_cache.m
  ............\tutorial.m
  ............\write_keypoint_file.m

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 To Search: SIFT SIFT matlab sifttutorial sift lowe Lowe David SIFT matlab g sift matl LOWE SIFT David G. Lo PGM sift lowe image corner 

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