Two-stage detector vs One-stage detector

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2 Stage Detector는 느린 속도 대신 정밀성을 확보할 수 있고 1 Stage Detector는 조밀하고 작은 물체를 감지할 때 성능이 저하되는 대신 빠른 속도를 예측할 수 있습니다.

Object detection 시, ROI Search와 ROI 내 Image Classification을 별도로 수행하면 Two-stage detector, 한번에 수행한다면 One-stage detector
- 속도 : Two Stage detector < One-stage detector(better)
- 정확도 : Two Stage detector(better) < One-stage detector
Traditional Methods
- Raw Image Segmentation → 유사 영역 Merge → 후보 영역(Candidate box) 추출
Two-stage detector
- R-CNN
  
  Info
  
  https://arxiv.org/pdf/1311.2524.pdf
- Fast RCNN
  
  Info
  
  https://www.cv-foundation.org/openaccess/content_iccv_2015/papers/Girshick_Fast_R-CNN_ICCV_2015_paper.pdf
- Faster RCNN
  
  Info
  
  https://arxiv.org/pdf/1506.01497.pdf
One-stage detector
- YOLO
  
  Info
  
  https://www.cv-foundation.org/openaccess/content_cvpr_2016/papers/Redmon_You_Only_Look_CVPR_2016_paper.pdf
- SSD
  
  Info
  
  https://arxiv.org/pdf/1512.02325.pdf
- RetinaNet
  
  Info
  
  https://arxiv.org/pdf/1708.02002.pdf
etc. Detection with Transformer
- DETR
  
  Info
  
  https://arxiv.org/pdf/2005.12872.pdf

참조