Patent classifications
G
PHYSICS
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G06
COMPUTING OR CALCULATING; COUNTING
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G06V
IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
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30/00
Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
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G06V30/18
Extraction of features or characteristics of the image
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G06V30/18143
Extracting features based on salient regional features, e.g. scale invariant feature transform [SIFT] keypoints
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G06V30/18152
Extracting features based on a plurality of salient regional features, e.g. "bag of words"
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