Fine-grained Visual Categorization using PAIRS: Pose and Appearance Integration for Recognizing Subcategories.
Year: 2018
Type: preprint
Abstract: In Fine-grained Visual Categorization (FGVC), the differences between similar categories are often highly localized to a small number of object parts, and significant pose variation therefore constitutes a great challenge for identification. To address this, we propose extracting image patches using pairs of predicted keypoint locations as anchor points. The benefits of this approach are two-fold: (1) it achieves explicit top-down visual attention on object parts, and (2) the extracted patches are pose-aligned and thus contain stable appearance features. We employ the popular Stacked Hourglass Network to predict keypoint locations, reporting state-of-the-art keypoint localization results on the challenging CUB-200-2011 dataset. Anchored by these predicted keypoints, an overcomplete basis of pose-aligned patches is extracted and a specialized appearance classification network is trained for each patch. An aggregating network is then applied to combine the patch networks' individual predictions, producing a final classification score. Our PAIRS algorithm attains an accuracy of 88.6%, an increase of 1.1% over the current state-of-the-art. Enhancing the base PAIRS model with single-keypoint patches produces a further improvement, yielding a new state-of-the-art accuracy of 89.2% on the CUB dataset and clearly demonstrating the power of integrating pose and appearance features.
Source: arXiv (Cornell University)
Authors: Pei Guo, Ryan Farrell
Language: English
Subfield: Computer Vision and Pattern Recognition
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2785420330