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Quantization of optical flows based on a histogram of orientations: a) a BBox and its corresponding optical flows (IOpt); b) the calculated histogram of orientations for optical flows in IOpt. Green circles indicate the selected bins after applying a threshold at 50% of the maximum population; c) Quantized optical flows based on the selected bins in (b). Bounding boxes of the quantized orientations (OBBox) are shown in green.
