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JP2002052026A   [0003]  [0004]  [0005] 
JP4749592B   [0055]  [0057]  [0073]  [0084] 
WO2011099102A1   [0118] 
JP5844325B   [0119] 

Visual Categorization with Bags of Keypoints   [0053] 
ImageNet Classification with Deep Convolutional Neural Networks   [0053]