  Few-shot object detection, which focuses on detecting novel objects with few
labels, is an emerging challenge in the community. Recent studies show that
adapting a pre-trained model or modified loss function can improve performance.
In this paper, we explore leveraging the power of Contrastive Language-Image
Pre-training (CLIP) and hard negative classification loss in low data setting.
Specifically, we propose Re-scoring using Image-language Similarity for
Few-shot object detection (RISF) which extends Faster R-CNN by introducing
Calibration Module using CLIP (CM-CLIP) and Background Negative Re-scale Loss
(BNRL). The former adapts CLIP, which performs zero-shot classification, to
re-score the classification scores of a detector using image-class
similarities, the latter is modified classification loss considering the
punishment for fake backgrounds as well as confusing categories on a
generalized few-shot object detection dataset. Extensive experiments on MS-COCO
and PASCAL VOC show that the proposed RISF substantially outperforms the
state-of-the-art approaches. The code will be available.
