Image representations derived from pre-trained Convolutional Neural Networks (CNNs) have become the new state of the art in computer vision tasks such as instance retrieval. This work explores the suitability for instance retrieval of image-and region-wise representations pooled from an object detection CNN such as Faster R-CNN. We take advantage of the object proposals learned by a Region Proposal Network (RPN) and their associated CNN features to build an instance search pipeline composed of a first filtering stage followed by a spatial reranking. We further investigate the suitability of Faster R-CNN features when the network is fine-tuned for the same objects one wants to retrieve. We assess the performance of our proposed system with the Oxford Buildings 5k, Paris Buildings 6k and a subset of TRECVid Instance Search 2013, achieving competitive results.
In addition, REF explores the suitability for INS of image and region-wise representations pooled from the trained Faster R-CNN or fine-turned Faster R-CNN with supervised information by combining re-ranking and query expansions.
Faster R-CNN Features for Instance Search
2016 IEEE Conference on Computer Vision and Pattern Recognition Workshops (CVPRW)
2016 IEEE Conference on Computer Vision and Pattern Recognition Workshops (CVPRW)
Computer Science