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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G06V30/40 Document-oriented image-based pattern recognition
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G06V30/41 Analysis of document content
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G06V30/418 Document matching, e.g. of document images
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