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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G06V30/10 Character recognition
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G06V30/18 Extraction of features or characteristics of the image
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G06V30/1801 Detecting partial patterns, e.g. edges or contours, or configurations, e.g. loops, corners, strokes or intersections
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G06V30/18019 by matching or filtering
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