SIFT (Scale Invariant Feature Transform)

  • Lowe. D. G (Distinctive Image Feature from Scale-Invariant Keypoints, 2004)
  • 시점 : 1997~
  • 이미지와 크기와 회전에 불변하는 특징을 추출하는 알고리즘.
  • 스케일이 축소된 일련의 이미지들 (이미지 피라미드) 에서 동일하게 검출되는 Scale Invariant 한 Feature 추출
  • 코너성을 측정하기 위해서는 DoG(Difference of Gaussian) 을 이용하여 스케일별 Laplacian 계산
  • 특징점이 풍부한 경우에 유리
키포인트 셀렉션 단계
스케일이 작거나, 커도 모두 검출
  • Disclaimer ! 딥러닝이 대두하기 전의 기법

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