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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10/00 Arrangements for image or video recognition or understanding
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G06V10/20 Image preprocessing
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G06V10/22 by selection of a specific region containing or referencing a pattern; Locating or processing of specific regions to guide the detection or recognition
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G06V10/225 based on a marking or identifier characterising the area
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