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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)

Notes on the topic

In Computer Vision, SIFT is a feature descriptor.

Other feature descriptors:

  • Group Invariant Feature Transform (GIFT)
  • Histogram of Oriented Gradients (HOG) ^ffb7e9
  • Speeded Up Robust Features (SURF)
  • Gradient Location and Orientation Histogram (GLOH)
  • Local Binary Pattern (LBP)
  • Vector of Locally Aggregated Descriptors (VLAD)

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