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Algorithms Used by Google Search

This was a question asked to me by Kalra

  • Scale Invariant Feature Transform (SIFT)

For extracting key points and descriptors:

  • Principal Component Analysis based Scale Invariant Feature Transform (PCA-SIFT)
  • Speeded Up Robust Features (SURF)

For Indexing and matching:

  • Locally-sensitive Hashing (LSH)

Note

In Computer Vision, SIFT is a feature descriptor
Other feature descriptors:

  • GIFT
  • HOG ^ffb7e9
  • SURF
  • GLOH
  • LBP
  • VLAD

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