Weakly Supervised Fine-Grained Image Categorization
نویسندگان
چکیده
In this paper, we categorize fine-grained images without using any object / part annotation neither in the training nor in the testing stage, a step towards making it suitable for deployments. Fine-grained image categorization aims to classify objects with subtle distinctions. Most existing works heavily rely on object / part detectors to build the correspondence between object parts by using object or object part annotations inside training images. The need for expensive object annotations prevents the wide usage of these methods. Instead, we propose to select useful parts from multi-scale part proposals in objects, and use them to compute a global image representation for categorization. This is specially designed for the annotationfree fine-grained categorization task, because useful parts have shown to play an important role in existing annotationdependent works but accurate part detectors can be hardly acquired. With the proposed image representation, we can further detect and visualize the key (most discriminative) parts in objects of different classes. In the experiment, the proposed annotation-free method achieves better accuracy than that of state-of-the-art annotation-free and most existing annotation-dependent methods on two challenging datasets, which shows that it is not always necessary to use accurate object / part annotations in fine-grained image categorization.
منابع مشابه
Weakly Supervised Learning of Part Selection Model with Spatial Constraints for Fine-Grained Image Classification
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عنوان ژورنال:
- CoRR
دوره abs/1504.04943 شماره
صفحات -
تاریخ انتشار 2015