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Deformable Part Descriptors for Fine-grained Recognition and Attribute Prediction
Deformable Part Descriptors for Fine-grained Recognition and Attribute Prediction
Trevor Darrell Forrest Iandola Ryan Farrell Ning Zhang
Abstract
Recognizing objects in fine-grained domains can beextremely challenging due to the subtle differences between subcategories. Discriminative markings are oftenhighly localized, leading traditional object recognition approaches to struggle with the large pose variation oftenpresent in these domains. Pose-normalization seeks to aligntraining exemplars, either piecewise by part or globallyfor the whole object, effectively factoring out differencesin pose and in viewing angle. Prior approaches reliedon computationally-expensive filter ensembles for part localization and required extensive supervision. This paper proposes two pose-normalized descriptors based oncomputationally-efficient deformable part models. Thefirst leverages the semantics inherent in strongly-supervisedDPM parts. The second exploits weak semantic annotations to learn cross-component correspondences, computing pose-normalized descriptors from the latent parts ofa weakly-supervised DPM. These representations enablepooling across pose and viewpoint, in turn facilitating taskssuch as fine-grained recognition and attribute prediction.Experiments conducted on the Caltech-UCSD Birds 200dataset and Berkeley Human Attribute dataset demonstratesignificant improvements over state-of-art algorithms.